任务完成后如何在WPF中启用按钮 [英] How to enable button in WPF when task is done

问题描述

我有一个按钮，点击它开始一个任务并禁用该按钮，当任务完成时，我想启用这个按钮.请给我任何想法、概念或代码，以便于我理解.

I have a button, click it to start a task and disable the button, when the task is completed, I want to enable this button. Please give me any idea, concept or code to make it easy for me to understand.

我的代码如下:

在 xaml 中:

<Button Name="myButton" Content="START" Click="ButtonStartClick" />

在 xaml.cs 中:

In xaml.cs:

 private void ButtonStartClick(object sender, RoutedEventArgs e)
 {
     RunTask();
     myButton.IsEnabled = false;
 }

在 viewModel.cs 中:

In viewModel.cs:

     private void OnTaskCompleted(string result)
     {
          //how to enable myButton
     }

推荐答案

这是第一个非常幼稚的方法，没有 MVVM

Here is a first very naive approach, without MVVM

 private async void ButtonStartClick(object sender, RoutedEventArgs e)
 {
     myButton.IsEnabled = false;
     await RunTask();
     myButton.IsEnabled = true;
 }

RunTask 声明如下:

where RunTask is declared like this:

 private async Task RunTask()
 {
     // await some other awaitable method(s)
 }

如果你有一个不可等待的长时间运行的任务，你可以像这样通过 Task.Run 运行它:

If you have a long running task that isn't awaitable, you may run it by Task.Run like this:

private async Task RunTask()
{
    await Task.Run(() =>
    {
        // do somthing here
    });
}

这篇关于任务完成后如何在WPF中启用按钮的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！