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European Silverlight 6 Hosting - HostForLIFE.eu :: Creating a Beautiful Splash Screen For Silverlight Applications

clock July 26, 2018 08:18 by author Peter

There are many other great articles and blog posts on how to create simple Silverlight Splash Screens. This article adds on top of them and helps you design a more complex splash screen with Story Boards and Floating Text Blocks. I am not a great designer and thus I am taking a design que from Telerik's Silverlight Demos splash screen. They have some amazing designers and their splash screen is an amazing example of that. If you have not already noticed it please visit http://demos.telerik.com/silverlight/ and have a look yourself. We will try to replicate the same behavior in our splash screen. Here is a step-by-step guide to do this.

1. Create your XAML
In order to add the splash screen you will first need to add a new Silverlight 1.0 JavaScript (we will refer to it as SLJS for the sake of writing simplicity) page on your server side code.

Since you cannot modify this file in Blend, I created a new Silverlight project and created a new Silverlight User control in it.
Once I had completed the design of this page in Blend, I copied the content to the Silverlight JS page on the server side.
I had to make a few modifications that are listed below.

  • First delete the x:class namespace as that is not supported on a SLJS page
  • Also delete the underlying code file (in my case it was SplashScreen.xaml.cs)
  • I added a storyboard animation to float the text from left to right

<Grid.Resources>
  <Storyboardx:Name="sb1"RepeatBehavior="1x"Completed="onCompleted">
    <DoubleAnimationDuration="0:0:5"To="255"
    Storyboard.TargetProperty="X"Storyboard.TargetName="myTranslate"d:IsOptimized="True"/>
  </Storyboard>
</Grid.Resources>

 
Based on your design, the following content may change (I designed it to match the same as Telerik's splash page):
<Grid Background="#FFF4F4F4" RenderTransformOrigin="0.5,0.5"> <Grid.RowDefinitions> <RowDefinition Height="120"/> <RowDefinition Height="32"/> <RowDefinition Height="8"/> <RowDefinition Height="20"/>
 <RowDefinition Height="375*"/> </Grid.RowDefinitions> <TextBlock HorizontalAlignment="Left" TextWrapping="Wrap" Grid.Row="0" Text="Silverlight" VerticalAlignment="Top" Height="153" Width="806" FontSize="133.333"
Foreground="#FFEEEEEE" Grid.RowSpan="3"/> <!--<StackPanel Orientation="Horizontal" Grid.Row="1" Margin="100,0,0,0" >
<Image Source="/Content/np_logo.PNG" Margin="0,0,5,0" Width="32" />
<TextBlock Text="Netpractise" FontSize="26.667" Foreground="Black"  FontFamily="Moire Light" x:Name="editing" FontWeight="ExtraBold" Height="32"/>
</StackPanel>--> <Image Source="/Content/np.PNG" Grid.Row="1" Margin="100,0,0,0" HorizontalAlignment="Left" /> <Rectangle Height="5" Fill="#FFA0DA0A" Width="200" HorizontalAlignment="Left"  Margin="100,0,0,0"
Grid.Row="2"/> <!--<TextBlock Text="digital communication innovation" Loaded="onTextBoxDigitalLoaded" Margin="100,0,0,0"  HorizontalAlignment="Left" FontFamily="Moire" FontSize="13.333" Height="16" Grid.Row="3"/>-->
<Image Source="/Content/baseline.PNG"  Margin="100,0,0,0" Width="300"  HorizontalAlignment="Left" Grid.Row="3"/> <!-- Progress bar--> <Rectangle Fill="#FF24A9F3" Height="5" HorizontalAlignment="Left" x:Name="uxProgress"
Grid.Row="2"/> <!--floating text boxes--> <TextBlock x:Name="textBlock" HorizontalAlignment="Left" TextWrapping="Wrap" Text="Be it Videos, Images, Flash or Audio we support all."
VerticalAlignment="Center" Grid.Row="4" Height="400"
Width="510" Foreground="#FF24A9F3" FontSize="48" FontFamily="Segoe WP Light" RenderTransformOrigin="0.5,0.5"
Loaded="onTextBoxLoaded" Margin="20,0,0,0"> <TextBlock.RenderTransform> <TransformGroup> <TranslateTransform x:Name="myTranslate"/> </TransformGroup> </TextBlock.RenderTransform> <!--The story board can be placed
within this to run from XAML or JS functions can be used.--> <!--<TextBlock.Triggers>
<EventTrigger RoutedEvent="TextBlock.Loaded">
<BeginStoryboard>
</BeginStoryboard>
</EventTrigger>               
</TextBlock.Triggers>--> </TextBlock> <TextBlock x:Name="txtProgressPercentage" Grid.Row="4" HorizontalAlignment="Right" Margin="0,-150,-170,0" VerticalAlignment="Center" TextWrapping="Wrap" Height="358" Width="651"
FontSize="300" Foreground="#FFE4E4E4"/> </Grid>


2. Code the logic in JavaScript file
When you add a new SLJS page in your application, it also creates an underlying .js file where you can write your code logic.
All I had to do was to create 3 functions in it ; they are:

onSourceDownloadProgressChanged

This is to update the progress bar and the big textblock that shows % update in numbers.
var i = 0;
function onSourceDownloadProgressChanged(sender, eventArgs)
{
sender.findName("txtProgressPercentage").Text = Math.round(Math.round((eventArgs.progress * 1000)) / 10, 1).toString();
//get browser width   var width = window.document.body.clientWidth;
sender.findName("uxProgress").Width = (width * eventArgs.progress);
}
 

onTextBoxLoaded
This is to trigger the first story board.
function onTextBoxLoaded(sender, eventArgs)
{
// Retrieve the Storyboard and begin it.     sender.findName("sb1").begin();
}


onCompleted
This is to change the Text of the floating Text box and start the Storyboard again with updated text.
function onCompleted(sender, eventArgs)
{
try{
i++;
sender.findName("myTranslate").X = 0;
switch (i) {
case 1:
sender.findName("textBlock").Text = "This is my first content";
break;
case 2:
sender.findName("textBlock").Text = "This is my second content";
break;
case 3:
sender.findName("textBlock").Text = "This is my third content.";
break;
case 4:
sender.findName("textBlock").Text = "This is my fourth content";
break;
case 5:
sender.findName("textBlock").Text = "This is my fifth content.";
break;
case 6:
sender.findName("textBlock").Text = "This is my sixth content";
i = 1;
break;
}
}catch(e){
}
sender.findName("sb1").begin();


I have 6 text block contents that show up on the screen one by one. You can have as many as you want and can also pull them from a collection if that's what you need.

3. Updating the Default.html or Default.aspx page
This is an important and the last step to hook the splash screen we created to our Silverlight application.
Just add a few parameters and a link to the JavaScript file just below the </head> tag.
<script type="text/javascript" src="splashscreen.js"></script>

The following new parameters go in <div id="silverlightControlHost">:
<param name="splashscreensource" value="SplashScreen.xaml" /> <param name="onSourceDownloadProgressChanged" value="onSourceDownloadProgressChanged" />

The first parameter just tells your app which splash screen to load at startup and the second one calls the js function that eventually updates the progress bar and % progress textblock with numbers.



European Silverlight 6 Hosting - HostForLIFE.eu :: Fixing Win32 Unhandled Exception in Silverlight Web App

clock July 24, 2018 08:49 by author Peter

Today while testing we encountered a strange scenario in our Silverlight Web App. We were getting a System Win 32 error when running the deployed application. unfortunately the error was not reproducible when running the app in debug (F5) mode.

Here is a snapshot of the exception message.

When starting a new instance of Visual Studio to debug this JIT issue all we got was that there was a Stack Overflow causing this issue. But that's all; no source code or stack trace to pinpoint the exact code that was causing the trouble.

How often do you get in a scenario where you can see a bug in deployed or published code but not in debug mode giving you no option to pinpoint the exact code causing the trouble? Believe me, it happens to me all the time.
 
I pop-in many Message Boxes in the methods that I feel could be erroneous & keep deleting them when I am sure that the method is not the one I am looking for.
 
Returnng to the issue today, I have a record in my Silverlight Grid, which when double-clicked should open a child window having the details & this part of the code was the culprit. Feels great to zero-in & find the guilty.
 
So the problem is in the child window looking forward tells me it's a TextBox that has the ValidatesOnDataErrors property set to true.

Here was how it was layed out on the screen:
<TextBox Text="{Binding ProfileName,ElementName=RadWinEditMenuProfile, Mode=TwoWay, NotifyOnValidationError=True, ValidatesOnExceptions=True,ValidatesOnDataErrors=True, TargetNullValue=''}"
 x:Name="txtBoxProfile" MaxLength="50" />
 
Notice the  ValidatesOnDataErrors=True property.
So next step was to remove it & Voila! It worked. No error this time.  But wait, we have that property set for a reason. We want to force the TextBox to show an error on all data validation errors. Having that figured out I knew the next thing we need to look into was the code that was doing the data validation.

Here is the code used for it:
Public ReadOnly Property [Error] As String Implements System.ComponentModel.IDataErrorInfo.Error
    Get
        Return _Errors
    End Get
End Property

Default Public ReadOnly Property Item(propertyName As String) As String Implements System.ComponentModel.IDataErrorInfo.Item
    Get
        Select Case propertyName
            Case "ProfileName"
                If String.IsNullOrWhiteSpace(ProfileName) = False Then
                    'ProfileName = ProfileName.Trim
                    If context.MenuProfiles.Any(Function(t) t.Id <> SelectedProfile.Id AndAlso t.ProfileName.ToLower.Trim = ProfileName.ToLower.Trim) Then
                        _Errors = _ErrorsText
                        Return "Profile Name is already in use."
                    ElseIf Regex.IsMatch(ProfileName.ToLower.Trim, CustomDeclaration.REG_NAME) = False Then
                        _Errors = _ErrorsText
                        Return CustomDeclaration.INVALID_NAME
                    End If
                End If
                Exit Select
        End Select
        Return Nothing
    End Get
End Property
Private _ProfileName As String
Public Property ProfileName() As String
    Get
        Return SelectedProfile.ProfileName
    End Get
    Set(ByVal value As String)
        _ProfileName = value
        SelectedProfile.ProfileName = value
        NotifyPropertyChanged("ProfileName")
    End Set
End Property

This is a standard implementation of IDataErrorInfo, so I will not get into the gory details of it and go directly to the code that was the issue.
Note that I have commented-out the line:
'ProfileName = ProfileName.Trim
 
This was the exact line of code causing the issue. I was trimming the property & then assigning it back, that in turn was calling the setter of the property & that in turn was calling the validation again.
 
Evidently, these two caused an infinite loop L L Not a good deal. This was the reason why we were getting the Stack Overflow error.  Commenting out that line & using trim wherever we were actually using the property.

For example:
Changed ProfileName.ToLower to ProfileName.ToLower.Trim fixed the issue once & for all. Nice & Cool.
 
So the next time you hit a stack overflow in your published code try to pin point the code & check if you are not implementing IDataErrorInfo or any other 2 properties that are dependent on each other like I was implementing it.



European Silverlight 6 Hosting - HostForLIFE.eu :: Add Silverlight Into a Web Page

clock July 19, 2018 09:24 by author Peter

This article explains how to add Silverlight into a web page using HTML. Use the following procedure to do this.

  • Create a Silverlight application
  • Add some TextBox and button to the XAML file
  • Write the logic on the click event of the button in the .cs file
  • Add a HTML page and add some tags to access the Silverlight generated .xap file

Step 1: Create a new project of Silverlight application named "SilverlightExample".

Uncheck the checkbox to not create a web project for hosting the Silverlight.


Step 2: In the default page named "MainPage.xaml", add 2 Textboxes for getting the input named "txtvalue1" and "txtvalue2" with blank text by default ( text=””) and add a button named "btnAdd" with content "Add". Then create onClick event of the button.
<TextBox Name="txtValue1" Text="" HorizontalAlignment="Left" Height="23" Margin="130,34,0,0" TextWrapping="Wrap"  VerticalAlignment="Top" Width="120"/>
<TextBox Name="txtValue2" Text="" HorizontalAlignment="Left" Height="23" Margin="130,85,0,0" TextWrapping="Wrap"  VerticalAlignment="Top" Width="120"/>
<Button  Name="btnAdd" Content="Add" Click="btnAdd_Click" HorizontalAlignment="Left" Margin="150,154,0,0" VerticalAlignment="Top" Width="75" />

Step 3: Write the code in the section of the onclick event of the button in "MainPage.xaml.cs" that will add the values of the textboxes and show the addition via alert message.
int value1 = Convert.ToInt32(txtValue1.Text);
int value2 = Convert.ToInt32(txtValue2.Text);
int result = value1 + value2;
MessageBox.Show(result.ToString());

Step 4: Now add a HTML Page named "MYPage.html" into the application.

Add an <object> tag to the HTML page with data, type, width and height attributes and <param> element with name and value attributes.
<object data="data:application/x-silverlight-2," type="application/x-silverlight-2"
     width="500" height="500">
    <param name="source" value="Bin/Debug/SilverlightExample.xap" />
</object>

  • data attribute and its value are recommended to avoid performance issues on some browsers.
  • type attribute and the specific value shown are also required. This value uses the Silverlight MIME type to identify the plug-in and the required version.
  • width and height attributes are required for cross-browser compatibility.
  • the <param> element named source is required and indicates the location and name of your application file.

Note: .xap exists in the bin/Debug folder, that's why value="Bin/Debug/SilverlightExample.xap".

Open the HTML file using a browser.

Open the html file via browser
Enter the 2 integer values into the textboxes respectively and press the button to see the ouput.

You can also create the .html file anywhere in your system and put the Silverlight generated .xap file with in the same folder, but in this case you need to write the value="SilverlightExample.xap" because now the .xap and .html files are in the same folder or location.



European Silverlight 6 Hosting - HostForLIFE.eu :: Use Map in Silverlight to show the location

clock July 17, 2018 08:58 by author Peter

Silverlight can support maps in a page to show a particular location. Silverlight provides the Bing map control. To use the bing map you need use two dll files name as Microsoft.Maps.MapControl and another one is Microsoft.Maps.MapControl.Common. Reference of this two dll is must to work with bing map.

By right clicking on the Add Reference on the project name in Solution Explorer, you can add references of these two dlls. 

Once the references are added, you can use the map control as following in your .xaml page:
xmlns:mc=http://schemas.openxmlformats.org/markup-compatibility/2006 
xmlns:m="clr-namespace:Microsoft.Maps.MapControl;assembly=Microsoft.Maps.MapControl"

The first mc is for the common map dll and second for the other dll name as MapControl. 

Now, in the Grid control add the map control like below:

<m:Map x:Name="testMapUs" CredentialsProvider="XXXXXXXXXX" ScaleVisibility="Collapsed" LogoVisibility="Collapsed" CopyrightVisibility="Collapsed" Background="White" Mode="Road" Center="" ZoomLevel="12"> 
<m:Pushpin Location="00.00000,-00.00000"/> 
</m:Map>

As shown above

The CredentialProvider is the key which can provide the credential to use the map that you can get it form this website.

http://www.bing.com/mapindia/?mkt=en-in

Also from this website, you will get the actual location that you want to show in your map control.

<m:Pushpin/> tag can show the pushpin location on your map so user can get the exact location directly.

You will also get an longitude of your location from the above site. As per shown above when you use this control it show Logo, Copyright text and scale on  the map. If you do not need to display these, you can remove it by setting its Visibility property to Collapsed. 

There is different modes in the map like Road and Aerial. To change the mode of the map there is one property name as Mode="Aerial". In both mode aerial and road, you can have possible to set the zoom level as per your requirement.


European Silverlight 6 Hosting - HostForLIFE.eu :: Spire For WPF, .NET And Silverlight Applications From E-ICEBLUE

clock July 12, 2018 08:35 by author Peter

This article is about my views on Spire.doc which I tried for development purposes on my personal site. Now, I would like to discuss a few points about it. Recently, I came across a tool for .NET developers named Spire, which has more features and is an easy GUI interface tool for clients. E-ICEBLUE has a large number of tools and helps developers  a lot with different streams like .NET, Windows Presentation Foundation, and Silverlight. E-ICEBLUE also helps in providing customer support towards all products for their clients.

Tools from E-ICEBLUE

For .NET

  • Office for .NET
  • OfficeViewer for .NET
  • Doc for .NET
  • DocViewer for .NET
  • XLS for .NET
  • Spreadsheet for .NET
  • Presentation for .NET
  • PDF for .NET
  • PDFViewer for .NET
  • PDFViewer for ASP.NET
  • DataExport for .NET

For WPF

  • Office for WPF
  • Doc for WPF
  • DocViewer for WPF
  • XLS for WPF
  • PDF for WPF
  • PDFViewer for WPF

For Silverlight

  • Office for Silverlight
  • Doc for Silverlight
  • XLS for Silverlight
  • PDF for Silverlight

I tried using Spire.Office for my developments on .NET and WPF.

  • Helps in opening all the file formats.
  • Develop your .NET applications with easy GUI.
  • Surf for your APIs with the help of the "HELP document" available with the software.
  • Helps in opening Word documents, Spreadsheets, PDFs, and your project files on .NET applications including WPF, ASP.NET, WinForms, Web Services, etc.
  • You have all options here which you can find in MS-Office, like find & replace, copy/paste, review your documents, working with extensions, etc.
  • Helps in the conversion of various file formats – Excel sheets – adding digital signatures, etc.

I tried working with WPF projects with Data Binding, Animations, MVVM model, developing a media player, isolated storage, etc., and I feel Spire helps us with all features that Microsoft Visual Studio has in it.

Still, Spire works in a large scale on conversion of file formats, merging the data, exporting the data, accessing all data file formats, and multiple printing orientations etc.



European Silverlight 6 Hosting - HostForLIFE.eu :: Update Data Using Silverlight RIA Enabled ServiceToday

clock July 10, 2018 11:28 by author Peter

Update Data Using Silverlight RIA Enabled ServiceToday, in this article let's play around with one of the interesting and most useful concepts in Silverlight.

Question: What is update data using Silverlight RIA enabled service?
In simple terms "This application enables to update the data in the database with help of Silverlight RIA enabled service. It uses base platform of entity framework to communicate with database".

Step 1: Create a database named "Company" with employee table in it.

Step 2: Open up Visual Studio and create a new Silverlight application enabled with RIA Services
Step 3: When the project is created. Right-click on RIA Service project and add new entity data model framework and set it up for previously created database.
Step 4: Again right click on RIA service project and add Domain Service Class as new item.
Step 5: Complete code of EmployeeDomain.cs looks like this (Domain Service Class)
namespace SilverlightRIAInsert.Web
{
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
using System.Data;
using System.Linq;
using System.ServiceModel.DomainServices.EntityFramework;
using System.ServiceModel.DomainServices.Hosting;
using System.ServiceModel.DomainServices.Server;
// Implements application logic using the CompanyEntities context.
// TODO: Add your application logic to these methods or in additional methods.
// TODO: Wire up authentication (Windows/ASP.NET Forms) and uncomment the following to disable anonymous access
// Also consider adding roles to restrict access as appropriate.
// [RequiresAuthentication][EnableClientAccess()]
public class EmployeeDomain : LinqToEntitiesDomainService<CompanyEntities>
{
    // TODO:// Consider constraining the results of your query method.  If you need additional input you can
    // add parameters to this method or create additional query methods with different names.
    // To support paging you will need to add ordering to the 'Employee'
    query.public IQueryable<Employee> GetEmployee()
    {
        return this.ObjectContext.Employee;
    }
    public void InsertEmployee(Employee employee)
    {
        if ((employee.EntityState != EntityState.Detached))
        {
            this.ObjectContext.ObjectStateManager.ChangeObjectState(employee, EntityState.Added);
        }
        else{this.ObjectContext.Employee.AddObject(employee);
        }
    }
    public void UpdateEmployee(Employee currentEmployee)
    {
        this.ObjectContext.Employee.AttachAsModified(currentEmployee, this.ChangeSet.GetOriginal(currentEmployee));
    }
    public void DeleteEmployee(Employee employee)
    {
        if ((employee.EntityState != EntityState.Detached))
        {
            this.ObjectContext.ObjectStateManager.ChangeObjectState(employee, EntityState.Deleted);
        }
        else{this.ObjectContext.Employee.Attach(employee);
           this.ObjectContext.Employee.DeleteObject(employee);
        }
    }
}
}


Step 6: Now rebuild the solution file.
Step 7: The complete code of MainPage.xaml looks like this:
<usercontrolx:class="SilverlightRIAInsert.MainPage"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"mc:ignorable="d"
d:designheight="300"d:designwidth="543">
<Gridx:Name="LayoutRoot"Width="608">
<TextBlockHeight="23"HorizontalAlignment="Left"Margin="152,29,0,0"Name="textBlock1"Text="Id"FontFamily="Verdana"FontSize="15"VerticalAlignment="Top"/>
<TextBoxHeight="23"HorizontalAlignment="Left"Margin="252,25,0,0"Name="textBox1"VerticalAlignment="Top"Width="120"/>
<TextBlockHeight="23"HorizontalAlignment="Left"Margin="150,72,0,0"Name="textBlock2"Text="FirstName"FontFamily="Verdana"FontSize="15"VerticalAlignment="Top"/>
<TextBoxHeight="23"HorizontalAlignment="Left"Margin="252,68,0,0"Name="textBox2"VerticalAlignment="Top"Width="120"/>
<TextBlockHeight="23"HorizontalAlignment="Left"Margin="150,113,0,0"Name="textBlock3"Text="LastName"FontFamily="Verdana"FontSize="15"VerticalAlignment="Top"/>
<TextBoxHeight="23"HorizontalAlignment="Left"Margin="252,113,0,0"Name="textBox3"VerticalAlignment="Top"Width="120"/>
<ButtonContent="Update"FontFamily="Verdana"FontSize="19"Background="DeepSkyBlue"Height="44"HorizontalAlignment="Left"Margin="252,206,0,0"Name="button1"VerticalAlignment="Top"Width="120"Click="button1_Click"/>
<TextBoxHeight="23"HorizontalAlignment="Left"Margin="252,155,0,0"Name="textBox4"VerticalAlignment="Top"Width="120"/>
<TextBlockHeight="23"HorizontalAlignment="Left"Margin="152,155,0,0"Name="textBlock4"Text="Age"FontFamily="Verdana"FontSize="16"VerticalAlignment="Top"/>
</Grid>"
</usercontrol>


Step 8: The complete code of MainPage.xaml.cs looks like this:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.ServiceModel.DomainServices.Client;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using SilverlightRIAUpdate.Web;
namespace SilverlightRIAUpdate
{
public partial class MainPage : UserControl
{
    public MainPage()
    {
        InitializeComponent();
    }
    EmployeeDomain objDomain = new EmployeeDomain();
    private void button1_Click(object sender, RoutedEventArgs e)
    {
        EntityQuery<Employee> query = objDomain.GetEmployeeQuery();
        objDomain.Load(query, UpdateLoad, null);
        MessageBox.Show("Data Updated Successfully");
    }
    public void UpdateLoad(LoadOperation<Employee> emp)
    {
        foreach (Employee e in objDomain.Employees)
        {
            if (e.Id == int.Parse(textBox1.Text))
           {
                e.FirstName = textBox2.Text;
                e.LastName = textBox3.Text;
                e.Age = int.Parse(textBox4.Text);
                objDomain.SubmitChanges();
                break;
            }
        }
    }
}
}

 



European Silverlight Hosting - HostForlIFE.eu :: Storing Files in SQL Server using WCF RIA Services and Silverlight

clock November 24, 2016 05:32 by author Scott

We have worked on several Silverlight Line of Business applications that require storing documents and files in a secure environment. There are several ways to accomplish this but one approach that has been successful for us is to store the documents using FILESTREAM Storage in SQL Server 2008. 

This is the first of three articles which will describe how you can create a Silverlight LOB application that stores and displays documents using FILESTREAM Storage in SQL Server 2008. 

1. Configuring FILESTREAM in your database and WCF RIA Services setup. 
2. Uploading and Saving files to the database from a Silverlight LOB application. 
3. Viewing files stored in the FILESTREAM from a Silverlight LOB application. 

Configuring FILESTREAM in you database

The first thing I would recommend is to read about FILESTREAM. Here is a tutorial which describes FILESTREAM. 

Okay, now that you read the entire white paper we are ready to roll! 

Setting up your database

Your database needs to enable FILESTREAM on the instance of the SQL Server Database Engine. 

Now that the FILESTREAM is enabled for the server you need to configure your database.

The basic steps include: 

1. Create a Filegroup of type Filestream

2. Create a File for the new Filestream Group

Now that your  database can handle FILESTREAM, the next is to create the SQL Tables that will store documents using the FILESTREAM. In this example I will be using three tables:

- File - storage for the document via the FILESTREAM
- Document - metadata about the File
- Folder - Virtual folder for the document

File table script

CREATE TABLE [dbo].[File]( [FileID] [int] IDENTITY(1,1) NOT NULL, [DocumentFileId] [uniqueidentifier] ROWGUIDCOL NOT NULL, [DocumentFile] [varbinary](max) FILESTREAM NULL, CONSTRAINT [File_PK] PRIMARY KEY CLUSTERED ( [FileID] ASC )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] FILESTREAM_ON [FileStreamGroup1], UNIQUE NONCLUSTERED ( [DocumentFileId] ASC )WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY] ) ON [PRIMARY] FILESTREAM_ON [FileStreamGroup1]

One thing we have found is that you only want to access the File table when you are ready to display the document. If you include this table in RIA Service Domain Service it will really slow things down—a lot. That is why we separated the metadata from the FILESTREAM into two tables - File and Document. 

Document table

You can add as many columns for metadata as needed for your project.  

A few things to notice:

1. This table contains a description and some metadata about the file. We use this table to bind a list of documents in a treeview or gridview control.
2. The guid field is used to create a second unique field. More to come on this in part 3.
3. Path will store the actual file name (e.g. MyDocument.pdf). We need this field so we can determine the type of file that is stored in the database (more on this in part 3).
4. FolderID points to a Folder table (see below). We use this table to organize documents in Folders.

Folder table

We use the ParentFolderID to enable nested folders.  

Okay, now our database is configured for FILESTREAM and we have the necessary tables to store documents. We are creating a Silverlight LOB application using WCF RIA Services, so assuming we already have our Silverlight project created our next steps will be:

1. Add/Update Entity Framework Entity Data Model (*.edmx) in the project. Include the File, Document, and Folder tables.
2. Add/Update Domain Service class and metadata for the three tables.

Tip - I like to include two methods when returning a Document. One that includes the File (i.e. Heavy version) and one that does not include the File (i.e. Lightweight version). This gives me flexibility on the client side. 

public Document GetDocumentById(int documentId) { return this.ObjectContext.Documents.Where(d => d.DocumentID == documentId).FirstOrDefault(); } public Document GetDocumentWithFileById(int documentId) { return this.ObjectContext.Documents.Include("File") .Where(d => d.DocumentID == documentId).FirstOrDefault(); }

To get a list of documents for a folder I use the following query. This can be bound to a gridview control. 

public IQueryable GetDocumentsByFolderId(int folderId) { return this.ObjectContext.Folders .Include("Document") .Where(f => f.FolderID == folderId).OrderByDescending(com => com.Document.CreatedDate); } 



European Silverlight 5 Hosting - HostForLIFE.eu :: How to Implement AutoComplete Text in Silverlight

clock October 5, 2016 23:59 by author Scott

Introduction

Silverlight is evolving with a lot of new features in each and every version release. The AutoComplete text feature is one such example. In this article I will demonstrate the implementation of the AutoComplete text feature in a Silverlight application. I will also create a sample Silverlight application to help explain the code. I have used Silverlight 4.0 and Visual Studio 2010 for developing the sample application.

AutoComplete Functionality

AutoComplete text functionality is not only a fancy effect but it's also a pretty useful feature from a user prospective and this feature is available in most of the latest applications. As the user enters text in a text box, a list of values gets populated and are listed in a similar fashion to that of a drop down based on the entered text. So the user is able to see the possible suggestions and can select a value from them or they also have the freedom to enter their own text as the base control is a textbox.

Some popular websites implementing the auto complete functionality are www.google.com,www.youtube.com, etc.,

Silverlight AutoCompleteBox Control

Implementing the autocomplete functionality in a Silverlight application is pretty straight forward because of the availability of the AutoCompleteBox control. This control is available in Silverlight 3.0 and higher versions. The developer only needs to set the ItemSource property of the AutoCompleteBox control with the value collection that is to be listed. The rest will be taken care by the control itself. 

Below are some of the useful settings that can be leveraged from the AutoCompleteBox control.

  1. FilterMode – Specifies the filter mode to display the data (StartsWith, Contains, Equals, etc.,)
  2. MinimumPrefixLength – Minimum prefix length for the auto complete feature to be triggered
  3. MaxDropDownHeight – Maximum height of the dropdown
  4. IsTextCompletionEnabled – If set to true then the first match found during the filtering process will be populated in the TextBox

 

Silverlight AutoCompleteBox Implementation

In this section we will create a sample Silverlight window implementing the autocomplete text feature. In the MainWindow.xaml add an AutoCompleteBox control and set the basic properties. Below is the code:

<UserControl xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk"  
    x:Class="AutoCompleteBoxSample.MainPage"
    xmlns=http://schemas.microsoft.com/winfx/2006/xaml/presentation
    xmlns:x=http://schemas.microsoft.com/winfx/2006/xaml
    xmlns:d=http://schemas.microsoft.com/expression/blend/2008
    xmlns:mc=http://schemas.openxmlformats.org/markup-compatibility/2006
    mc:Ignorable="d"
    d:DesignHeight="300" d:DesignWidth="400">

    <Grid x:Name="LayoutRoot" Background="White">
        <Canvas>
            <sdk:Label Content="Enter the city: " Margin="46,76,264,198" />
            <sdk:AutoCompleteBox Height="28" H
orizontalAlignment="Left" Margin="142,77,0,0" FilterMode="StartsWith"
MinimumPrefixLength="1" MaxDropDownHeight="80" Name="autoCompleteBox1" VerticalAlignment="Top" Width="120"
Canvas.Left="-6" Canvas.Top="-5" />
        </Canvas>
    </Grid>
</UserControl>

namespace AutoCompleteBoxSample
{
    public partial class MainPage : UserControl
    {
        List<string> _cities;

        public MainPage()
        {
            InitializeComponent();
            autoCompleteBox1.ItemsSource = PopulateCities();
        }

        private IEnumerable PopulateCities()
        {
            _cities = new List<string>();
            _cities.Add("Boston");
            _cities.Add("Bangalore");
            _cities.Add("Birmingham");
            _cities.Add("Auckland");
            _cities.Add("Amsterdam");
            _cities.Add("Aspen");
            return _cities;
        }
    }
}

Run the application and you will see the figure below:

 

 

Using a DomainDataSource

In the above case we had the data directly in the application and it was hence hard-coded. In case if the data lies in the database, then the WCF RIA service and the DomainDataSource comes into play. Create a WCF RIA service and hook up the service to expose the data in the table through a generated data context method. Use a DomainDataSource to act as an ItemSource for the AutoCompleteBox control.

Below is the XAML code:

<Canvas>
     <riaControls:DomainDataSource AutoLoad="True"
                                      QueryName="GetCities"
                                      x:Name="CityDataSource">
          <riaControls:DomainDataSource.DomainContext>
                    <web:MyDatabaseContext />
          </riaControls:DomainDataSource.DomainContext>
     </riaControls:DomainDataSource>
     <sdk:Label Content="Enter the city: " Margin="46,76,264,198" />
<sdk:AutoCompleteBox Height="28" ItemsSource="{Binding Data, ElementName=CityDataSource}"
HorizontalAlignment="Left" Margin="142,77,0,0" FilterMode="StartsWith" MinimumPrefixLength="1" MaxDropDownHeight="80"
Name="autoCompleteBox1" VerticalAlignment="Top" Width="120" Canvas.Left="-6" Canvas.Top="-5" />
</Canvas>



Silverlight Hosting - HostForLIFE.eu :: Bundling native DLL:s in Silverlight 5 RC applications

clock February 5, 2014 18:12 by author Peter

One of the many interesting new features in Silverlight 5 RC is the ability for elevated trust applications (in-browser as well as out-of-browser) to access native DLL:s via P/Invoke.
Some interesting application examples are given here and here. These examples show how easy it is to access system DLL:s such as user32.dll, kernel32.dll and psapi.dll. However, the issue appears to be more complex when it comes to native DLL:s that are not automatically available on the system.
Ideally (I think), you would like to bundle the native third party DLL:s as Content in the XAP file, and the XAP file would be artificially included in the P/Invoke search path. Unfortunately, this is not the way it works today. When I bundle my third-party native DLL as Content in my Silverlight 5 RC application, and try to access one of its methods via the following declaration,

[DllImport("NativeDll")]

public static extern int add(int a, int b);
I get a discouraging DllNotFoundException. It does not help if I add the .dll extension to the file name, and I have also not been able to find the DLL by applying any of the pack URI approaches to the DLL file name.
Several people, including myself, have brought up this issue in various forums, but so far I have not seen any published solution to the problem.
Well, as we say in Sweden, "själv är bäste dräng" (which is similar to "if you want something done, do it yourself"), so here is my attempt to solve the problem. Granted, it might not be the most Elegant Solution, but at least it is A Solution.
It is important to note that this solution is applicable primarily to Silverlight 5 RC. In the best of worlds, Microsoft will fix the native DLL path issue in the RTM release of Silverlight 5, and then this solution would be superfluous. We'll see what happens in the end.Note also that since P/Invoke is a feature requiring elevated trust, this solution is only relevant to applications running in elevated trust (in- or out-of-browser).

In short, the solution is to bundle the native third party DLL:s as resource files in the Silverlight 5 RC application, and when the application is started copy these DLL:s to a local directory and add the directory to the system path during the execution of the Silverlight application.In more details, here is how it can be done:Add each native third party DLL as an existing item to the root folder or, even more preferably, to an assets sub-folder in the Silverlight 5 RC application project.

In the File Properties window, set Build Action to Resource and Copy to Output Directory to Copy if newer.

The DLL copying and PATH environment variable setting of course requires some additional code. Fortunately :-) I have created a static utility class for this purpose. The class is named NativeDllHelper and can be found it is entirety here. Download and add this file to your Silverlight 5 RC application project.

Next, go to the App.xaml.cs or equivalent file. Add the following using statement.

using Cureos.Utility;

In the Application_Startup (or equivalent) event handler, add the following method call to the first line of the event handler.
NativeDllHelper.SetupNativeDllFolder("relpath/dllname.dll", ...);

where relpath is the path relative to the project root folder where the native DLL:s are located, and dllname is the file name of the DLL. Specify all DLL:s to be copied in one argument list; the SetupNativeDllFolder method should only be called once at start-up to avoid adding duplicate entries of the local DLL directory to the system path.
The native DLL files are copied to a My Documents sub-folder Silverlight\Native. If you prefer a different folder for the DLL:s, edit the static constructor of the NativeDllHelper class.

Here is an example call of SetupNativeDllFolder, copying one file NativeDll.dll located in the Assets sub-folder of the Silverlight 5 RC application project.
NativeDllHelper.SetupNativeDllFolder("Assets/NativeDll.dll");
Having performed these steps, no user intervention is required when running the application, the native methods in the third party DLL:s can simply be invoked using only the file name of the DLL:
[DllImport("NativeDll")]
public static extern int add(int a, int b);

A complete example SL 5 RC application utilizing this functionality can be downloaded from here. Note that it contains a C(++) project for creating the example native DLL.
If you try out the application and get build errors due to copy prevention the first time, building a second time should do the trick. You might also need to manually set the start page of the Web project to the .aspx file.

The application itself is very simple; there is this button

with the following click event handler associated to it:
private void Button_Click(object sender, RoutedEventArgs e)
{
  button.Content = add(5, 7);
}

The add method is a native method, as declared above. Clicking the button leaves us with the following satisfying button update:
And that is basically all that there is to it. The utility method for copying DLL:s from the application resources can most certainly be further improved, for example by more efficiently handling DLL:s already existing locally. With the current implementation, any existing DLL:s are automatically overwritten. All improvement suggestions as well as reports of successes or failures are highly appreciated.



European Silverlight 4.0 Hosting - Amsterdam :: How To Control Playback of Media Using a MediaElement of Silverlight?

clock December 10, 2013 06:02 by author Patrick

We can integrate media into our Silverlight pages and WPF UserControls. The MediaElement object provides several media-specific properties. The following list describes the commonly used properties.

  •     AutoPlay: Specifies whether the MediaElement should begin playing automatically. The default value is True.
  •     IsMuted: Specifies whether the MediaElement is silenced. A value of True mutes the MediaElement. The default value is False.
  •     Stretch: Specifies how video is stretched to fill the MediaElement object. Possible values are None, Uniform, UniformToFill, and Fill. The default is Fill.
  •     Volume: Specifies the volume of the MediaElement object’s audio as a value from 0 to 1, with 1 being the loudest. The default value is 0.5.


In addition to its media-specific properties, MediaElement also has all the properties of a UIElement, such as Opacity and Clip.

 


Controlling Media Playback

You can control media playback by using the Play, Pause, and Stop methods of a MediaElement object.

<Canvas
    xmlns="http://schemas.microsoft.com/client/2007"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Loaded="CanvasLoaded">
    <MediaElement x:Name="MyMedia" Stretch="Uniform"
        Source="/images/Silverlight_Small.wmv" Height="200" Width="200" />
  <Canvas x:Name="ButtonPanel">
      <Canvas Background="Red" Canvas.Left="10" Canvas.Top="185" Height="25" Width="50"
        MouseLeftButtonDown="StopMedia" Cursor="Hand">
        <Rectangle Height="30" Width="40" Canvas.Left="10" />
        <TextBlock Text="Stop" Canvas.Left="10" Foreground="Yellow" />
       </Canvas>
       
       <Canvas Background="Green" Canvas.Left="70" Canvas.Top="185" Height="25" Width="50"
        MouseLeftButtonDown="PlayMedia" Cursor="Hand">
        <Rectangle Height="30" Width="40" Canvas.Left="10" />
        <TextBlock Text="Play" Canvas.Left="10" Foreground="Yellow" />
       </Canvas>
       
       <Canvas Background="Blue" Canvas.Left="130" Canvas.Top="185" Height="25" Width="60"
        MouseLeftButtonDown="PauseMedia" Cursor="Hand">
        <Rectangle Height="30" Width="40" Canvas.Left="10" />
        <TextBlock Text="Pause" Canvas.Left="10" Foreground="Yellow" />
       </Canvas>
       
       <Canvas Background="Black" Canvas.Left="10" Canvas.Top="215" Height="25" Width="180"
        MouseLeftButtonDown="ToggleFullScreen" Cursor="Hand">
        <Rectangle Height="30" Width="40" Canvas.Left="10" />
        <TextBlock Text="Full Screen" Canvas.Left="55" Foreground="Yellow" />
       </Canvas>
    </Canvas>
  </Canvas>    

// --------- JavaScript Code to control the Media object -------------
// Fires when Canvas is loaded
function CanvasLoaded(sender, args)
{
    var canvas = sender.getHost();
    canvas.content.onfullScreenChange = onFullScreenChanged;                            
}
// Fires when Full screen is changed
function onFullScreenChanged(sender, args)
{
    var canvas = sender.getHost();
    var buttonPanel = sender.findName("ButtonPanel");
    // Change the opacity of the button panel so that in the full screen it disappears and in normal screen it appears
    if (canvas.content.fullScreen == true)
        buttonPanel.opacity = 0;
    else
        buttonPanel.opacity = 1;
    // change the media object height and width to the canvas height and width
    var media = sender.findName("MyMedia");
    media.width = canvas.content.actualWidth;
    media.height = canvas.content.actualHeight;
}
//Fires when Full Screen button is clicked
function ToggleFullScreen(sender, args)
{
    var canvas = sender.getHost();
    canvas.content.fullScreen = !canvas.content.fullScreen;
}
// Fires when Stop button is clicked
function StopMedia(sender, args)
{
    sender.findName("MyMedia").stop();
}
// Fires when Play button is clicked
function PlayMedia(sender, args)
{
    sender.findName("MyMedia").play();
}
// Fires when Pause button is clicked
function PauseMedia(sender, args)
{
    sender.findName("MyMedia").pause();

Hope this helps!!



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