按需加载程序集

                 本篇主要学习了按需加载程序集。

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;
//添加命名空间
using SilverlightClassLibrary;
using System.Windows.Browser;

//实例说明：面的示例代码演示如何从主机服务器按需检索程序集，然后将其加载到当前应用程序域中
//实现的三个步骤
//(1)在Client端应用程序项目中添加了对程序集的引用
//(2)对着程序集右键属性，将程序集的"复制本地"值还必改为"False".非必须，只是为了体现按需下载的好处还是设为false
//(3)将程序集剪切到服务器端的ClientBin目录下（xap所在的目录）.
namespace LoadByNeed
{
    public partial class MainPage : UserControl
    {
        public MainPage()
        {
            InitializeComponent();
        }
        private void TextBlock_MouseLeftButtonUp(
           object sender, MouseButtonEventArgs e)
        {
            // Download an "on-demand" assembly.
            WebClient wc = new WebClient();
            wc.OpenReadCompleted +=new OpenReadCompletedEventHandler(wc_OpenReadCompleted);
            //Uri uri = new Uri("http://localhost:1826/SilverlightClassLibrary.dll", UriKind.RelativeOrAbsolute);
            //这个方式可以将目录放到Web下的根目录下，这样要添加http头部信息
            // Uri uri = new Uri(GetUriHead()+"SilverlightClassLibrary.dll", UriKind.RelativeOrAbsolute);
            //该方式只需要将SilverlightClassLibrary.dll复制到ClientBin目录下（xap所在的目录）
            Uri uri = new Uri("SilverlightClassLibrary.dll", UriKind.RelativeOrAbsolute);
            wc.OpenReadAsync(uri);
        }

        private void wc_OpenReadCompleted(
            object sender, OpenReadCompletedEventArgs e)
        {
            if ((e.Error == null) && (e.Cancelled == false))
            {
                // Convert the downloaded stream into an assembly that is
                // loaded into current AppDomain.
                AssemblyPart assemblyPart = new AssemblyPart();
                assemblyPart.Load(e.Result);
                DisplayPageFromLibraryAssembly();
            }
        }

        private void DisplayPageFromLibraryAssembly()
        {
            // Create an instance of the Page class in the library assembly.
            Page1 page = new Page1();
            // Display the new Page. 
            this.stackPanel.Children.Add(page);
        }

        //获取URI头部：
        //例如http://localhost:1826/LoadByNeedTestPage.aspx
        //截取后:http://localhost:1826/
        public static string GetUriHead()
        {
            string returnValue = string.Empty;
            string str = HtmlPage.Document.DocumentUri.ToString();
            if (str != null && !str.Equals(string.Empty))
            {
                int index = str.LastIndexOf('/');
                returnValue = str.Substring(0, index + 1);
            }
            return returnValue;
        }

    }
}

实例下载