稳扎稳打Silverlight(31) - 2.0Tip/Trick之加载XAP, 加载XAML, 加载DLL, AppManifest.xaml文件说明

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稳扎稳打Silverlight(31) - 2.0Tip/Trick之加载XAP, 加载XAML, 加载DLL, AppManifest.xaml文件说明, 自定义鼠标指针

作者：webabcd


介绍
Silverlight 2.0 提示和技巧系列

• 加载XAP - 加载指定的 xap 文件到当前的 Silverlight 应用程序中 
• 加载XAML - 加载指定的 xaml 文件到当前的 Silverlight 应用程序中
• 加载DLL - 加载指定的 dll 文件，并调用其中的方法或加载其中的控件
• AppManifest.xaml文件说明 - 简要说明 AppManifest.xaml 文件内容中各个节点的作用 
• 自定义鼠标指针 - 实现自定义的鼠标指针，即鼠标跟随

在线DEMO
http://webabcd.blog.51cto.com/1787395/342779


示例
1、在 Silverlight 程序中加载指定的 xap 文件
LoadXap.xaml

<UserControl x:Class="Silverlight20.Tip.LoadXap"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"    
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
        <Grid x:Name="LayoutRoot" Background="White">
                <StackPanel>
                        <Button x:Name="load" Content="加载游戏 - 俄罗斯方块" Click="load_Click" Margin="5" />
                        <Grid x:Name="container" Margin="5" />
                </StackPanel>
        </Grid>
</UserControl>

 

LoadXap.xaml.cs

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.Windows.Resources;
using System.IO;
using System.Xml.Linq;
using System.Reflection;

namespace Silverlight20.Tip
{
         public partial class LoadXap : UserControl
        {
                 public LoadXap()
                {
                        InitializeComponent();
                }

                 private void load_Click( object sender, RoutedEventArgs e)
                {
                        Uri uri = new Uri( "YYTetris.xap", UriKind.Relative);

                         // 用 WebClient 下载指定的 XAP
                        WebClient client = new WebClient();
                        client.OpenReadCompleted += new OpenReadCompletedEventHandler(client_OpenReadCompleted);
                        client.OpenReadAsync(uri);
                }

                 void client_OpenReadCompleted( object sender, OpenReadCompletedEventArgs e)
                {
                         /*
                         * StreamResourceInfo - 提供对通过 Silverlight 应用程序模型检索资源的支持
                         * AssemblyPart - 包含在 Silverlight 程序内的程序集
                         *         AssemblyPart.Load() - 加载指定的程序集到当前应用程序域中
                         * Application.GetResourceStream() - 对 zip 类型的文件自动解压缩
                         */

                         // YYTetris.xap 的 AppManifest.xaml 的信息如下
                         /*    
                        <Deployment xmlns="http://schemas.microsoft.com/client/2007/deployment" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" EntryPointAssembly="YYTetris" EntryPointType="YYTetris.App" RuntimeVersion="2.0.31005.0">
                            <Deployment.Parts>
                                <AssemblyPart x:Name="YYTetris" Source="YYTetris.dll" />
                            </Deployment.Parts>
                        </Deployment>        
                        */

                         // 可以通过 Deployment.Current 检索 AppManifest.xaml 中的 Deployment 对象

                         // 取得 XAP 的 AppManifest.xaml 中的 Deployment.Parts 内的全部 AssemblyPart 节点信息
                        StreamResourceInfo resource = App.GetResourceStream(
                                 new StreamResourceInfo(e.Result, null),    
                                 new Uri( "AppManifest.xaml", UriKind.Relative));
                         string resourceManifest = new StreamReader(resource.Stream).ReadToEnd();
                        List<XElement> assemblyParts = XDocument.Parse(resourceManifest).Root.Elements().Elements().ToList();

                        Assembly assembly = null;

                         foreach (XElement element in assemblyParts)
                        {
                                 // 取出 AssemblyPart 的 Source 指定的 dll
                                 string source = element.Attribute( "Source").Value;
                                AssemblyPart assemblyPart = new AssemblyPart();
                                StreamResourceInfo streamInfo = App.GetResourceStream(
                                         new StreamResourceInfo(e.Result, "application/binary"),
                                         new Uri(source, UriKind.Relative));

                                 if (source == "YYTetris.dll")
                                        assembly = assemblyPart.Load(streamInfo.Stream);
                                 else
                                        assemblyPart.Load(streamInfo.Stream);
                        }

                         // 实例化 YYTetris.xap 的主函数
                        var type = assembly.GetType( "YYTetris.Page");
                        var yyTetris = Activator.CreateInstance(type) as UIElement;

                         // 添加 YYTetris.xap 到指定的容器内，并更新 UI
                        container.Children.Add(yyTetris);
                        container.UpdateLayout();
                }
        }
}

 

 

2、在 Silverlight 程序中加载指定的 xaml 文件
LoadXaml.xaml.cs

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.Windows.Resources;
using System.IO;

namespace Silverlight20.Tip
{
         public partial class LoadXaml : UserControl
        {
                 public LoadXaml()
                {
                        InitializeComponent();

                         this.Loaded += new RoutedEventHandler(LoadXaml_Loaded);
                }

                 void LoadXaml_Loaded( object sender, RoutedEventArgs e)
                {
                         // 获取指定的 Xaml
                        Uri uri = new Uri( "/Silverlight20;component/Tip/XamlDemo.xaml", UriKind.Relative);
                        StreamResourceInfo resource = App.GetResourceStream(uri);

                         using (StreamReader reader = new StreamReader(resource.Stream))
                        {
                                 // XamlReader.Load() - 加载 Xaml
                                UserControl control =
                                        System.Windows.Markup.XamlReader.Load(reader.ReadToEnd()) as UserControl;

                                LayoutRoot.Children.Add(control);
                        }
                }
        }
}

 

 

3、在 Silverlight 程序中加载指定的 dll 文件，并调用其中的方法或加载其中的控件
LoadDllDemo.Test.cs

using System;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;

namespace LoadDllDemo
{
         public class Test
        {
                 /// <summary>
                 /// Say Hello 的方法
                 /// </summary>
                 /// <param name="name">名字</param>
                 /// <returns></returns>
                 public string Hello( string name)
                {
                         return "Hello: " + name;
                }
        }
}

 

LoadDll.xaml

<UserControl x:Class="Silverlight20.Tip.LoadDll"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"    
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
        <Grid x:Name="LayoutRoot" Background="White">
                
                <TextBlock x:Name="lblResult" Margin="5" />
                
        </Grid>
</UserControl>

 

LoadDll.xaml.cs

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 Silverlight20.Tip
{
         public partial class LoadDll : UserControl
        {
                 public LoadDll()
                {
                        InitializeComponent();

                         this.Loaded += new RoutedEventHandler(LoadDll_Loaded);
                }

                 void LoadDll_Loaded( object sender, RoutedEventArgs e)
                {
                        Uri uri = new Uri( "LoadDllDemo.dll", UriKind.Relative);

                         // 用 WebClient 下载指定的 DLL
                        WebClient client = new WebClient();
                        client.OpenReadCompleted += new OpenReadCompletedEventHandler(client_OpenReadCompleted);
                        client.OpenReadAsync(uri);
                }

                 void client_OpenReadCompleted( object sender, OpenReadCompletedEventArgs e)
                {
                         // 加载指定的 dll
                        AssemblyPart assemblyPart = new AssemblyPart();
                        Assembly assembly = assemblyPart.Load(e.Result);

                         // 调用 LoadDllDemo.Test 的 Hello 方法，参数为 webabcd
                        Type type = assembly.GetType( "LoadDllDemo.Test");
                         object obj = Activator.CreateInstance(type);
                        MethodInfo methodInfo = type.GetMethod( "Hello");
                        lblResult.Text = methodInfo.Invoke(obj, new object[] { "webabcd" }).ToString();


                         // 注：
                         // AssemblyPart.Load() 用于把程序集加载到当前程序域
                         // 此特性可实现按需加载程序集（部署时，把这类的程序集从 xap 包中移除，用到时再调用指定发方法下载即可）
                }
        }
}

 

 

4、简要说明 AppManifest.xaml 文件内容中各个节点的作用

<Deployment xmlns="http://schemas.microsoft.com/client/2007/deployment" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" EntryPointAssembly="Silverlight20" EntryPointType="Silverlight20.App" RuntimeVersion="2.0.31005.0">
    <Deployment.Parts>
        <AssemblyPart x:Name="Silverlight20" Source="Silverlight20.dll" />
        <AssemblyPart x:Name="Microsoft.Windows.Controls" Source="Microsoft.Windows.Controls.dll" />
    </Deployment.Parts>
</Deployment>

一个 Silverlight 应用程序包（xap）内都会包含 AppManifest.xaml 文件，其内标识着打包的程序集和程序入口等信息

Deployment - 根节点
EntryPointAssembly - 程序入口的程序集
EntryPointType - 程序入口的类型
RuntimeVersion - 所需的 Silverlight 插件的版本
AssemblyPart - 标识 Silverlight 程序包（xap）内的程序集。其中的 Source 属性用于标识程序集的路径

 

 

5、自定义鼠标指针，即鼠标跟随
CustomMouseCursor.xaml

<UserControl x:Class="Silverlight20.Tip.CustomMouseCursor"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"    
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
        <Grid x:Name="LayoutRoot" Background="Bisque">
                <Canvas x:Name="canvas">
                        <Ellipse x:Name="ellipse" Width="30" Height="30" Fill="Red" />
                </Canvas>
        </Grid>
</UserControl>

 

CustomMouseCursor.xaml.cs

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;

namespace Silverlight20.Tip
{
         public partial class CustomMouseCursor : UserControl
        {
                 public CustomMouseCursor()
                {
                        InitializeComponent();

                         this.MouseMove += new MouseEventHandler(MouseFollow_MouseMove);
                }

                 // 自定义鼠标指针的实现如下。鼠标跟随也是同理的做
                 void MouseFollow_MouseMove( object sender, MouseEventArgs e)
                {
                        ellipse.SetValue(Canvas.LeftProperty, e.GetPosition(canvas).X - ellipse.ActualWidth / 2);
                        ellipse.SetValue(Canvas.TopProperty, e.GetPosition(canvas).Y - ellipse.ActualHeight / 2);
                }
        }
}

 

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