class="htmledit_views">

 

下面的示例代码演示如何从主机服务器按需检索程序集，然后将其加载到当前应用程序域中。

此示例使用 WebClient 类启动程序集的异步下载以响应用户鼠标单击。当下载完成后，将使用 AssemblyPart 类来加载此程序集。

此示例假定您已在您的应用程序项目中添加了对程序集的引用。该程序集的"复制本地"值还必须为"False"，这样，它将不会部署在应用程序包中。有关更多信息，请参见应用程序结构。

  示例

XAML

复制代码

 

    
  
        
   
            
    
     Page from Host Application
    
            
    
     
                Click Here to Display a UI from the Library Assembly
            
    
        
   
    
  



 

Visual Basic

复制代码

Imports SilverlightLibrary

Partial Public Class HomePage
    Inherits UserControl

    Public Sub New()
        InitializeComponent()
    End Sub

    Private Sub TextBlock_MouseLeftButtonUp(ByVal sender As Object, _
        ByVal e As MouseButtonEventArgs)

        ' Download an "on-demand" class="tags" href="/tags/ASSEMBLY.html" title=assembly>assembly. 
        Dim wc As New WebClient()
        AddHandler wc.OpenReadCompleted, AddressOf wc_OpenReadCompleted
        wc.OpenReadAsync(New Uri("SilverlightLibrary.dll", UriKind.Relative))

    End Sub

    Private Sub wc_OpenReadCompleted(ByVal sender As Object, _
        ByVal e As OpenReadCompletedEventArgs)

        If (e.[Error] Is Nothing) AndAlso (e.Cancelled = False) Then

            ' Convert the class="tags" href="/tags/DOWNLOAD.html" title=download>downloaded stream into an class="tags" href="/tags/ASSEMBLY.html" title=assembly>assembly that is 
            ' loaded into current AppDomain. 
            Dim class="tags" href="/tags/ASSEMBLY.html" title=assembly>assemblyPart As New AssemblyPart()
            class="tags" href="/tags/ASSEMBLY.html" title=assembly>assemblyPart.Load(e.Result)

            DisplayPageFromLibraryAssembly()

        End If

    End Sub

    Private Sub DisplayPageFromLibraryAssembly()

        ' Create an instance of the Page class in the class="tags" href="/tags/LIBRARY.html" title=library>library class="tags" href="/tags/ASSEMBLY.html" title=assembly>assembly. 
        Dim page As New Page()

        ' Display the new Page. 
        Me.stackPanel.Children.Add(page)

    End Sub

End Class

C#

复制代码

using System; // Uri
using System.Net; // WebClient,OpenReadCompletedEventHandler
using System.Windows; // AssemblyPart
using System.Windows.Controls; // UserControl
using System.Windows.Input; // MouseButtonEventArgs
using SilverlightLibrary; // Page

namespace SilverlightApplication
{
    public partial class HomePage : UserControl
    {
        public HomePage()
        {
            InitializeComponent();
        }

        private void TextBlock_MouseLeftButtonUp(
            class="tags" href="/tags/OBJECT.html" title=object>object sender, MouseButtonEventArgs e)
        {
            // Download an "on-demand" class="tags" href="/tags/ASSEMBLY.html" title=assembly>assembly.
            WebClient wc = new WebClient();
            wc.OpenReadCompleted += 
                new OpenReadCompletedEventHandler(wc_OpenReadCompleted);
            wc.OpenReadAsync(
                new Uri("SilverlightLibrary.dll", UriKind.Relative));
        }

        private void wc_OpenReadCompleted(
            class="tags" href="/tags/OBJECT.html" title=object>object sender, OpenReadCompletedEventArgs e)
        {
            if ((e.Error == null) && (e.Cancelled == false))
            {
                // Convert the class="tags" href="/tags/DOWNLOAD.html" title=download>downloaded stream into an class="tags" href="/tags/ASSEMBLY.html" title=assembly>assembly that is
                // loaded into current AppDomain.
                AssemblyPart class="tags" href="/tags/ASSEMBLY.html" title=assembly>assemblyPart = new AssemblyPart();
                class="tags" href="/tags/ASSEMBLY.html" title=assembly>assemblyPart.Load(e.Result);

                DisplayPageFromLibraryAssembly();
            }
        }

        private void DisplayPageFromLibraryAssembly() {

            // Create an instance of the Page class in the class="tags" href="/tags/LIBRARY.html" title=library>library class="tags" href="/tags/ASSEMBLY.html" title=assembly>assembly.
            Page page = new Page();

            // Display the new Page. 
            this.stackPanel.Children.Add(page);
        }
    }
}

若要查看该示例的运行版本，请单击下面的链接。

运行此示例

  请参见

参考

WebClient

AssemblyPart

其他资源

应用程序结构