Passing Parameters from ASP.NET to Silverlight

Follow the instruction from Creating Silverlight 2 Project

Demo.aspx

<%@ Page Language="C#" AutoEventWireup="true"

  CodeBehind="Demo.aspx.cs" Inherits="PassingParametersToSilverlight.Web.Demo" %>

<!DOCTYPE html PUBLIC

  "-//W3C//DTD XHTML 1.0 Transitional//EN"

  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<%@ Register Assembly="System.Web.Silverlight" Namespace="System.Web.UI.SilverlightControls"

  TagPrefix="asp" %>

<html xmlns="http://www.w3.org/1999/xhtml">

<head runat="server">

  <title></title>

</head>

<body>

  <form id="form1" runat="server">

    <div>

      <asp:ScriptManager ID="ScriptManager1" runat="server" />

      <asp:Silverlight

        ID="Xaml1" runat="server" Source="~/ClientBin/PassingParametersToSilverlight.xap"

        MinimumVersion="2.0.31005.0" Width="300px" Height="200px" />

    </div>

    <br /><br />

    Name:  <asp:TextBox ID="txtName" runat="server"></asp:TextBox>

    <br /><br />

    Content:  <asp:TextBox ID="txtContent" runat="server"></asp:TextBox>

    <br /><br />

    <asp:Button ID="btnSubmit" runat="server" OnClick="btnSubmit_Click" Text="Submit" />

  </form>

</body>

</html>

Demo.aspx.cs

Xaml1.InitParameters can be used from asp.net to pass comma delimited name value key pairs.

using System;

using System.Text;

using System.Configuration;

namespace PassingParametersToSilverlight.Web

  public partial class Demo : System.Web.UI.Page

    protected void Page_Load(object sender, EventArgs e)

      if (!this.IsPostBack)

        Xaml1.InitParameters = BuildSilverlightParams(null, null);

    private string BuildSilverlightParams(string name, string content)

      if (string.IsNullOrEmpty(name))

        name = ConfigurationManager.AppSettings["Name"];

      if(string.IsNullOrEmpty(content))

        content = ConfigurationManager.AppSettings["Content"];

      StringBuilder sb = new StringBuilder();

      sb.AppendFormat("Name={0}", name);

      sb.AppendFormat(",Content={0}", content);

      return sb.ToString();

    protected void btnSubmit_Click(object sender, EventArgs e)

      Xaml1.InitParameters = BuildSilverlightParams(txtName.Text, txtContent.Text);

Web.config

<appSettings>

    <add key="Name" value="Betsy Moo"/>

    <add key="Content" value="Betsy is my dog's name!"/>

</appSettings>

Page.xaml

<UserControl x:Class="PassingParametersToSilverlight.Page"

    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

    Width="400" Height="300"      
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"      
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"      
    mc:Ignorable="d">

    <Grid x:Name="LayoutRoot" Background="White">

      <TextBox Margin="31,64,145,0"          
         Text="" TextWrapping="Wrap" VerticalAlignment="Top"          
         Height="60" x:Name="txtMsg"/>

  </Grid>

</UserControl>

Page.xaml.cs

using System;

using System.Collections.Generic;

using System.Windows.Controls;

using System.Text;

namespace PassingParametersToSilverlight

  public partial class Page : UserControl

    public Page(IDictionary<string, string> paramValues)

      InitializeComponent();

      BuildMessage(paramValues);

    private void BuildMessage(IDictionary<string, string> paramValues)

      StringBuilder sb = new StringBuilder();

      sb.AppendFormat("Who is {0} ?{1}", paramValues["Name"], Environment.NewLine);

      sb.AppendFormat("{0}", paramValues["Content"]);

      txtMsg.Text = sb.ToString();

App.xaml.cs

e.InitParams contains name value key pairs set from asp.net page Xaml1.InitParameters

private void Application_Startup(object sender, StartupEventArgs e)

  this.RootVisual = new Page(e.InitParams);