Dynamic Load & Invoke Other Xap For SilverLight 2.0

如何加载并调用Xap包呢？步骤如下，另附步骤注释（供参考）

 DynamicInvokeXap.Xaml

 1 <UserControl x:Class="Silverlight2._0.DynamicInvokeXap"
 2     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
 3     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Width="400" Height="300">
 4     <Grid x:Name="LayoutRoot" Background="White">
 5         <StackPanel>
 6             <TextBox x:Name="LastNameSearch" Width="200" Height="25"/>
 7             <Button Click="Button_Click" Content="Submit Search" Width="200" Height="25"></Button>
 8             <StackPanel x:Name="Panel1"></StackPanel>
 9         </StackPanel>
10     </Grid>
11 </UserControl>

动态加载加Xap代码：

 WebClient webClient = new WebClient();
 webClient.OpenReadCompleted += new OpenReadCompletedEventHandler(webClient_OpenReadCompleted);
 webClient.OpenReadAsync(new Uri("http://localhost/Silverlight.Web/ClientBin/SilverlightAttatch.xap"), UriKind.Relative); 

 有关于Uri地址：（这里有一个目录问题要注意一下）
       1.如果你aspx在项目根目录，Uri("SilverlightAttatch.xap"),即可
       2.如果你aspx在目录中 如：Project -- Folder -- X.aspx
          建议直接用地址访问，不然会UriFormatException
          new Uri("http://localhost/Silverlight.Web/ClientBin/SilverlightAttatch.xap")
        

再看看webClient_OpenReadCompleted事件是如何加载dll,以及相关dll调用.

Step 1: (具体相关内容参见：另附)

//加载AppManifest.xaml,把需要加载（布署）的Dll配置到Appmanifest.xaml中
String appManifest = new StreamReader(Application.GetResourceStream(
                                      new StreamResourceInfo(e.Result, null), 
                                      new Uri("AppManifest.xaml", UriKind.Relative)
                                      ).Stream).ReadToEnd();

另附:动态加载的appmanifest.xaml内容

<Deployment xmlns="http://schemas.microsoft.com/client/2007/deployment" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" EntryPointAssembly="SilverlightAttatch" EntryPointType="SilverlightAttatch.App" RuntimeVersion="2.0.31005.0">
  <Deployment.Parts>
    <AssemblyPart x:Name="SilverlightAttatch" Source="SilverlightAttatch.dll" />
    <AssemblyPart x:Name="System.Windows.Controls.Data" Source="System.Windows.Controls.Data.dll" />
    <AssemblyPart x:Name="System.Windows.Controls" Source="System.Windows.Controls.dll" />
  </Deployment.Parts>
</Deployment>

Step 2:

转换一下对象（XElement），不然就不能直接应用于Linq To Xml进行查询
XElement deploy = XDocument.Parse(appManifest).Root;

List<XElement> parts = ( from assemblyParts in deploy.Elements().Elements()
                         select assemblyParts
                        ).ToList();

Step 3:

这里对appmanifest.xaml中的进行一下loop
目的：1.是SilverlightAttatch.dll作为Assembly进行处理，直接load
2.对于其他dll作为assembly的一些reference，直接进行AssemblyPart的load

Assembly assebmly = null;
foreach (XElement xe in parts) {
    String source = xe.Attribute("Source").Value;
    AssemblyPart asmPart = new AssemblyPart();
    StreamResourceInfo streamInfo = Application.GetResourceStream(
                                    new StreamResourceInfo(e.Result, "application/binary"),
                                    new Uri(source, UriKind.Relative));

     if (source.Equals("SilverlightAttatch.dll")){
           assebmly = asmPart.Load(streamInfo.Stream);
     }
     else{
           asmPart.Load(streamInfo.Stream);
     }
}

Step 4:

到数据源的查询，并返回数据到UI容器
Panel1.DataContext = DynDataSource.GetCustomerInfos(LastNameSearch.Text);
            
创建一个UserControl实例
UIElement element = assebmly.CreateInstance("SilverlightAttatch.Page") as UIElement;

加载相应的Silverlight's UserControl
Panel1.Children.Add(element);

更新UI
Panel1.UpdateLayout();

 Step 5:

 1相关数据源类
 2public class DynDataSource{
 3        public static List<CustomerInfo> GetCustomerInfos(String name)
 4        {
 5            List<CustomerInfo> custs = GetAllCustomerInfos();
 6
 7            var query = from c in custs
 8                        where name.ToUpper().StartsWith(c.Name)
 9                        select c;

            return query.ToList();
        }

        internal static List<CustomerInfo> GetAllCustomerInfos()
        {
            List<CustomerInfo> customerInfos = new List<CustomerInfo>();
            {
                customerInfos.Add(new CustomerInfo { ID = 1, Name = "AAA" });
                customerInfos.Add(new CustomerInfo { ID = 2, Name = "BBB" });
                customerInfos.Add(new CustomerInfo { ID = 3, Name = "CCC" });
                customerInfos.Add(new CustomerInfo { ID = 4, Name = "DDD" });
                customerInfos.Add(new CustomerInfo { ID = 5, Name = "EEE" });
                customerInfos.Add(new CustomerInfo { ID = 6, Name = "FFF" });
                customerInfos.Add(new CustomerInfo { ID = 7, Name = "GGG" });
            }
            return customerInfos;
        }
}

    public class CustomerInfo
    {
        public int ID { get; set; }
        public String Name { get; set; }
    }

Step 6:(需要加载的Xap包中Page.xaml)

 <UserControl x:Class="SilverlightAttatch.Page"
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
     xmlns:data="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data">
     <Grid x:Name="LayoutRoot" Background="White">
         <data:DataGrid x:Name="SearchResults" AutoGenerateColumns="True" ItemsSource="{Binding}"></data:DataGrid>
     </Grid>
 </UserControl>