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：

1  WebClient webClient  =   new  WebClient();
2  webClient.OpenReadCompleted  +=   new  OpenReadCompletedEventHandler(webClient_OpenReadCompleted);
3  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
 2 public   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;
10
11            return query.ToList();
12        }
13
14        internal static List<CustomerInfo> GetAllCustomerInfos()
15        {
16            List<CustomerInfo> customerInfos = new List<CustomerInfo>();
17            {
18                customerInfos.Add(new CustomerInfo { ID = 1, Name = "AAA" });
19                customerInfos.Add(new CustomerInfo { ID = 2, Name = "BBB" });
20                customerInfos.Add(new CustomerInfo { ID = 3, Name = "CCC" });
21                customerInfos.Add(new CustomerInfo { ID = 4, Name = "DDD" });
22                customerInfos.Add(new CustomerInfo { ID = 5, Name = "EEE" });
23                customerInfos.Add(new CustomerInfo { ID = 6, Name = "FFF" });
24                customerInfos.Add(new CustomerInfo { ID = 7, Name = "GGG" });
25            }
26            return customerInfos;
27        }
28}
29
30      public   class  CustomerInfo
31      {
32        public int ID { get; set; }
33        public String Name { get; set; }
34    }

 

Step 6:(需要加载的Xap包中Page.xaml)

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