task，不好用啊

[货郎大叔]

private void Button_Click(object sender, RoutedEventArgs e)
{
    Task<string> task = Task.Run<string>(() => DoSomeThing());
    MessageBox.Show("主线程继续执行");
    MessageBox.Show(task.IsCompleted.ToString());
    string s2 = task.Result;
}
private string DoSomeThing()
{
    Thread.Sleep(5000); //模拟耗时计算
    string s = "我好想";
    return s;
}

上面的代码，Task不是所谓一个异步任务吗？异步执行DoSomeThing方法获取一个字符串，赋值给s2，可是为什么界面还是阻塞等待啊，呈现卡死状，这与不要Task没什么区别啊

[枫雁]

方法要加 aysnc 关键词

private async void Button_Click(object sender, RoutedEventArgs e)
{
Task<string> task = Task.Run<string>(() => DoSomeThing());
MessageBox.Show("主线程继续执行");
MessageBox.Show(task.IsCompleted.ToString());
string s2= await task;
}