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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);
                }
        }
}