Silverlight中的反射

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#silverlight #assembly #object #download #class #string

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本文介绍Silverlight中反射机制的应用，包括动态创建当前程序集、XAP包内及其他在线Silverlight程序集中的类实例的方法，并提供具体示例代码。

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 System; using System.Collections.Generic; using System.Linq; using System.Net; 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 System.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.ProgressPercentage + "%"; } 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.