Silverlight 动态调用XAP 发生异常解决方法

  怎么在Silverlight 动态调用XAP  我就不说了

  问题在于很多人调用时候总发生异常不知所云。

  我就把我的经验说说：

 1、首先你应该找找动态调用的代码有没有问题

 这是我找的没有问题的方法：

<UserControl x:Class="DynamicLoad.MainPage"    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"    mc:Ignorable="d"    d:DesignHeight="300" d:DesignWidth="400">    <Grid x:Name="LayoutRoot" Background="White">        <Border BorderBrush="Silver" BorderThickness="1" Height="271" HorizontalAlignment="Left" Name="border1" VerticalAlignment="Top" Width="400" />        <Button Content="Button" Height="23" HorizontalAlignment="Left" Margin="166,277,0,0" Name="button1" VerticalAlignment="Top" Width="75" Click="button1_Click" />    </Grid></UserControl>

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;using System.Windows.Resources;using System.IO;using System.Xml;namespace DynamicLoad{    public partial class MainPage : UserControl    {        public MainPage()        {            InitializeComponent();        }        private void button1_Click(object sender, RoutedEventArgs e)        {            try            {                //下载BeCalled1.xap                 WebClient webClient = new WebClient();                webClient.OpenReadCompleted += client_OpenReadCompleted;                webClient.OpenReadAsync(new Uri("SilverlightApplicationLdaptest.xap", UriKind.RelativeOrAbsolute));            }            catch (Exception ex)            {                MessageBox.Show(ex.Message + "," + ex.StackTrace);            }        }        void client_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)        {            if (e.Error == null)            {                //透過 GetResourceStream 方法取得的其他套件，提供資源資料流資訊                StreamResourceInfo xapResource = new StreamResourceInfo(e.Result, null);                //將其中的AppManifest讀取出來                StreamResourceInfo appManifest = Application.GetResourceStream(xapResource, new Uri("AppManifest.xaml", UriKind.Relative));                //建立xml reader                XmlReader xmlReader = XmlReader.Create(appManifest.Stream, new XmlReaderSettings { DtdProcessing = DtdProcessing.Ignore });                List<Assembly> list = new List<Assembly>();                while (!xmlReader.EOF)                {                    if (xmlReader.ReadToFollowing("AssemblyPart"))                    {                        string dll = xmlReader.GetAttribute("Source");                        StreamResourceInfo dllStreamInfo = Application.GetResourceStream(xapResource, new Uri(dll, UriKind.Relative));                        AssemblyPart part = new AssemblyPart();                        Assembly assembly = part.Load(dllStreamInfo.Stream);                        list.Add(assembly);                    }                }                Assembly appAssembly =                    list.SingleOrDefault((a) =>                    a.FullName.StartsWith("SilverlightApplicationLdaptest")　//这个和XAP包 里面DLL名字必须相同                                    );                Type type = appAssembly.GetType("SilverlightApplicationLdaptest.MainPage");　//呼叫MainPage那Contol                UserControl control = Activator.CreateInstance(type) as UserControl;                border1.Child = control;            }        }    }}

2、 你调用XAP 如果用到Web引用 还有App 级别的资源，那么你的主项目就是 调用方必须也要引用。否则会报找不到web服务节点或者找不到资源的问题。

3、如果你用到WebClient那么是无法在本机就是直接打开Html页面方式使用。必须使用服务器，就是地址是http://这种