void ButtonDown_Click(object sender, RoutedEventArgs e)
{
actionDemo = str => demoSource.StrInfo = str;
ButtonDown.Content = "Downloading";
DownLoadDel downMethod = DoDownLoad;
TextBoxInfo.Text = "Current Thread:" + Thread.CurrentThread.ManagedThreadId;
downMethod.BeginInvoke(TextBoxURL.Text, CallBack, downMethod);
}
private void CallBack(IAsyncResult asy)
{
if (asy == null)
{
throw new ArgumentNullException("asy");
}
DownLoadDel del = asy.AsyncState as DownLoadDel;
Trace.Assert(del != null, "Invalid object types");
del.EndInvoke(asy);
}
