SilverLight-非托管代码初始化进度条显示方法

概述<object data="data:application/x-silverlight-2," type="application/x-silverlight-2" width="100%" height="100%">         <param  name="SplashScreenSource" value="SplashScreen.xaml"/>         <param nam <object data="data:application/x-silverlight-2," type="application/x-silverlight-2" wIDth="100%" height="100%">
        <param  name="SplashScreenSource" value="SplashScreen.xaml"/>
        <param name="OnSourceDownloadProgressChanged" value="OnSourceDownloadProgressChanged" />
<param name="source" value="ClIEntBin/SilverlightAppTest.xap"/>
      <param name="onError" value="onSilverlightError" />
      <param name="background" value="white" />
     <param name="minRuntimeVersion" value="4.0.50826.0" />
     <param name="autoUpgrade" value="true" />
    <a href="http://go.microsoft.com/fwlink/?linkID=149156&v=4.0.50826.0" >
   <img src="http://go.microsoft.com/fwlink/?linkID=161376" alt="获取 Microsoft Silverlight" />
    </a>

</object>

在Silverlight加载时Object标签中新加入两个参数:

1.SplashScreenSource属性用于标记初始屏幕xaml页

2.OnSourceDownloadProgressChanged属性用于加载进度变化时的事件处理程序

程序如下:

SplashScreenSource.xaml:

<GrID x:name="LayoutRoot" Background="White">
        <StackPanel HorizontalAlignment="Center">
            <GrID HorizontalAlignment="Center">
                <Rectangle stroke="#FFDEE6F0" HorizontalAlignment="left" WIDth="300" 
Height="10" RadiusX="2" RadiusY="2" strokeThickness="1"/>
                <Rectangle Fill="#FF7E99C8" HorizontalAlignment="left" VerticalAlignment="Center" 
strokeThickness="0" RadiusX="0" RadiusY="0" WIDth="296" Height="6" x:name="progressbar" 
RendertransformOrigin="0,0.5" margin="4">
                    <Rectangle.Rendertransform>
                        <Scaletransform x:name="progressbarScale" />
                    </Rectangle.Rendertransform>
                </Rectangle>
            </GrID>
            <GrID HorizontalAlignment="Center">
                <TextBlock x:name="progresstext" margin="18,17,19" Height="26" Text="0%" 
FontSize="16" Opacity="0.8" VerticalAlignment="Bottom" TextAlignment="Right"/>
                <TextBlock x:name="progresstext2" margin="18,7,8" Height="70" Text="0%" 
FontSize="50" Opacity="0.04" FontWeight="Bold" VerticalAlignment="Bottom" TextAlignment="Right"/>
            </GrID>
        </StackPanel>
    </GrID>

OnSourceDownloadProgressChanged

function OnSourceDownloadProgressChanged(sender,args) {
            sender.findname("progresstext").Text = Math.round(eventArgs.progress * 100) + "%";
            sender.findname("progresstext2").Text = Math.round(eventArgs.progress * 100) + "%";
            sender.findname("progressbarScale").ScaleX = eventArgs.progress;
        }

这样就自定义了一个非托管代码的初始化进度条显示.

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