在Silverlight中加载MainPage_Loaded之前运行WebClient.DownloadStringCompleted

Question

我想在MainPage_Loaded

之前加载此事件处理程序

WebClient wc = new WebClient(); 

wc.DownloadStringCompleted += new 
DownloadStringCompletedEventHandler(wc_DownloadStringCompleted);

wc.DownloadStringAsync(new Uri("./ImageList.xml", UriKind.Relative));

void wc_DownloadStringCompleted(object sender, 
    System.Net.DownloadStringCompletedEventArgs e){.....}

Answer 1

我认为这是问题 我想在加载MainPage之前“加载一些资源”“异步”！

WebClient wc = new WebClient(); 

wc.DownloadStringCompleted += 
            new DownloadStringCompletedEventHandler(wc_DownloadStringCompleted);

wc.DownloadStringAsync(new Uri("./ImageList.xml", UriKind.Relative));

void wc_DownloadStringCompleted(object sender, System.Net.DownloadStringCompletedEventArgs e){.....}

答案

如果它是您的应用程序的主页面，那么您可以将此代码添加到Application_Startup事件处理程序中的“app.xaml.cs”。请注意，由于您是异步加载资源，因此您应该在事件处理程序中加载主页而不是Application_Startup，除非您在完成资源加载过程之前不关心主页是否已加载。