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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://www.cnblogs.com/webabcd/archive/2008/10/09/1307486.html


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);
        }

    }

}



OK
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