如何使用异步方式连续更新GUI [英] How to update GUI continuously with async

问题描述

只需创建一个WPF项目.net 4.6

Just created a WPF project .net 4.6

并将此代码放入

lbl1是GUI上的标签

但是标签永远不会更新，而while循环仅持续1次

But the label is never updated or the while loop continue only 1 time

        private void Button_Click_1(object sender, RoutedEventArgs e)
    {
        var t = Task.Run(
       async () =>
      {
           await AsyncLoop();
       });

    }

    async Task AsyncLoop()
    {
        while (true)
        {
            string result = await LoadNextItem();
            lbl1.Content = result;
        }
    }

    private static int ir11 = 0;
    async Task<string> LoadNextItem()
    {
        ir11++;
        return "aa " + ir11;
    }

推荐答案

请使用Application.Current.Dispatcher.Invoke来访问ui线程

Please user Application.Current.Dispatcher.Invoke to access the ui thread

async Task AsyncLoop()
    {
        while (true)
        {
            string result = await LoadNextItem();
Application.Current.Dispatcher.Invoke(new Action(() => {  lbl1.Content = result; }));

        }
    }

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