在创建后台线程WP7的BitmapImage [英] Creating BitmapImage on background thread WP7

问题描述

我收到一个UnauthorizedAccessException（无效的跨线程访问。）在后台（线程池）线程运行以下code时，这是预期的行为？

  VAR URI =新的URI（resourcevault /图像/ defaultSearch.png，UriKind.Relative）;
 VAR信息= Application.GetResourceStream（URI）; //这一行抛出异常....
 this.defaultSearchImage =新的BitmapImage（）;
 

解决方案

究其原因是因为你的后台线程不能直接用于更新UI。相反，你需要使用调度元帅到UI线程的数据。事情是这样的：

  VAR URI =新的URI（resourcevault /图像/ defaultSearch.png，UriKind.Relative）;
VAR信息= Application.GetResourceStream（URI）;Dispatcher.BeginInvoke（（）=＆GT; {
    this.defaultSearchImage =新的BitmapImage（）;
}）;
 

I'm receiving an UnauthorizedAccessException ("Invalid cross-thread access.") when running the following code on a background (threadpool) thread, is this expected behaviour?

 var uri = new Uri("resourcevault/images/defaultSearch.png", UriKind.Relative);
 var info = Application.GetResourceStream(uri);

 // this line throws exception....
 this.defaultSearchImage = new BitmapImage();

解决方案

The reason is because your background thread cannot directly be used to update the UI. Instead, you need to use a Dispatcher to marshal the data on to the UI thread. Something like this:

var uri = new Uri("resourcevault/images/defaultSearch.png", UriKind.Relative);
var info = Application.GetResourceStream(uri);

Dispatcher.BeginInvoke(() => {        
    this.defaultSearchImage = new BitmapImage();
});

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