Silverlight中的反射

     Silverlight中的反射与.NET FRAMEWORK中的略有不同。以下分三种情况描述：

     1：动态创建当前执行的程序集中的类实例。

     2：动态创建XAP包中其它SILVERLIGHT程序集中的类实例。

     3：动态下载并创建网站上其它SILVERLIGHT程序集中的类实例。

 

1：动态创建当前执行的程序集中的类实例

     示例代码如下，其中ChildWindowMsg是你自己创建的类。

Assembly assem = Assembly.GetExecutingAssembly(); ChildWindowMsg cw = assem.CreateInstance("YiPin.QuestionsDbSL.ChildWindowMsg") as ChildWindowMsg;

 

2：动态创建XAP包中其它SILVERLIGHT程序集中的类实例

Assembly assem = Assembly.GetExecutingAssembly(); ChildWindowMsg cw = Assembly.Load("YiPin.QuestionsDbSL").CreateInstance("YiPin.QuestionsDbSL.ChildWindowMsg") as ChildWindowMsg;

 

3：动态下载并创建网站上其它SILVERLIGHT程序集中的类实例

For example we can write a usercontrol to download the assembly: using Sy<a href="/tag/stem/" target="_blank" class="keywords">stem</a>; using Sy<a href="/tag/stem/" target="_blank" class="keywords">stem</a>.Collections.Generic; using Sy<a href="/tag/stem/" target="_blank" class="keywords">stem</a>.Linq; using Sy<a href="/tag/stem/" target="_blank" class="keywords">stem</a>.Net; using Sy<a href="/tag/stem/" target="_blank" class="keywords">stem</a>.Windows; using Sy<a href="/tag/stem/" target="_blank" class="keywords">stem</a>.Windows.Controls; using Sy<a href="/tag/stem/" target="_blank" class="keywords">stem</a>.Windows.Documents; using Sy<a href="/tag/stem/" target="_blank" class="keywords">stem</a>.Windows.Input; using Sy<a href="/tag/stem/" target="_blank" class="keywords">stem</a>.Windows.Media; using Sy<a href="/tag/stem/" target="_blank" class="keywords">stem</a>.Windows.Media.Animation; using Sy<a href="/tag/stem/" target="_blank" class="keywords">stem</a>.Windows.Shapes; using Sy<a href="/tag/stem/" target="_blank" class="keywords">stem</a>.Reflection; namespace SilverlightApplication15 { public partial class DownloadUserControl : UserControl { public string Source { get; set; } public DownloadUserControl() { InitializeComponent(); this.Loaded += new RoutedEventHandler(DownloadUserControl_Loaded); } void DownloadUserControl_Loaded(object sender,RoutedEventArgs e) { WebClient client = new WebClient(); client.OpenReadCompleted += new OpenReadCompletedEventHandler(OnAssemblyOpened); client.DownloadProgressChanged += new DownloadProgressChangedEventHandler(client_DownloadProgressChanged); client.OpenReadAsync(new Uri(Source)); } void client_DownloadProgressChanged(object sender,DownloadProgressChangedEventArgs e) { this.txtProgress.Text = e.Progre<a href="/tag/ssp/" target="_blank" class="keywords">ssp</a>ercentage + "%"; } void OnAssemblyOpened(object sender,OpenReadCompletedEventArgs e) { AssemblyPart assemblyPart = new AssemblyPart(); Assembly assembly = assemblyPart.Load(e.Result); Control largecontrol = assembly.CreateInstance("LargeCustomControl.LargeControl") as Control; if (largecontrol != null) { this.txtProgress.Visibility = Visibility.Collapsed; this.LayoutRoot.Children.Add(largecontrol); } } } } <UserControl x:Class="SilverlightApplication15.DownloadUserControl" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Width="400" Height="300"> <Grid x:Name="LayoutRoot" Background="White"> <TextBlock x:Name="txtProgress"></TextBlock> </Grid> </UserControl> To use it in Page.xaml: <c:DownloadUserControl Source="http://localhost/LargeCustomControl.dll"></c:DownloadUserControl> You just have to privde the uri of the dll of your large custom control.