异步尝试阻止WPF [英] Async Attempt WPF Blocking

问题描述

我学习异步/等待关键字。我看不出什么，我在这里做语法写的吗？

I'm learning about async/await keywords. I can't see what I'm doing wrote here syntactically?

我有以下两种方法：

private async Task<string> PopupAsync()
{
  String result;
  using (StreamReader reader = File.OpenText(@"C:\temp\JBM_SchedulingModule.xap"))
  {
    Console.WriteLine("Opened file.");
    txtData.Text = "Opened file.";
    result = await reader.ReadToEndAsync();

  }
  return result;
}

和

private async void Button_Click(object sender, RoutedEventArgs e)
{
  txtData.Text = await PopupAsync();
}

当我preSS按钮的主UI线程被冻结，我不希望它。试图了解为什么，以及如何解决。

The main UI thread is freezing when I press the button and I don't want it to. Trying to understand why and how to fix.

谢谢！

推荐答案

斯蒂芬是正确的。我想到了。因为它应该是它的工作。为什么它被阻塞的原因是不是因为ReadToEndAsync（），但所花费的时间来填充+加载一个4MB的字符串（从文件）到WPF控件。

Stephen is right. I figured it out. It does work as it's supposed to it. The reason why it was blocking was not because of ReadToEndAsync(), but the time it took to populate + load a 4MB string (from a file) to a WPF control.

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