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我有一个关于最佳实践的问题。在使用下面两种帮助程序加载方法时,什么时候是最好的时间来调用回调用户界面? Button1在返回时使用Dispatcher,Button2允许帮助器加载类在分派器上封装调用。我倾向于Button2。最佳实践:何时返回UI线程
private void Button1_Click(object sender, RoutedEventArgs e)
{
AsyncLoader.LoadAsyncWithoutDispatcher(delegate(string result)
{
this.Dispatcher.Invoke((Action)delegate { this.TextBox1.Text = result; });
});
}
private void Button2_Click(object sender, RoutedEventArgs e)
{
AsyncLoader.LoadAsyncWithDispatcher(this.Dispatcher, delegate(string result)
{
this.TextBox1.Text = result;
});
}
class AsyncLoader
{
public static void LoadAsyncWithoutDispatcher(Action<string> completed)
{
var worker = new AsyncClass();
worker.BeginDoWork(delegate(IAsyncResult result)
{
string returnValue = worker.EndDoWork(result);
completed(returnValue);
}, null);
}
public static void LoadAsyncWithDispatcher(Dispatcher dispatcher, Action<string> completed)
{
var worker = new AsyncClass();
worker.BeginDoWork(delegate(IAsyncResult result)
{
string returnValue = worker.EndDoWork(result);
dispatcher.Invoke(completed, returnValue);
}, null);
}
}