System.Threading.Task不包含定义 [英] System.Threading.Task does not contain definition

问题描述

我在System.Threading.Task上没有.Delay定义.

I cant have .Delay definition on my System.Threading.Task.

 public async Task<string> WaitAsynchronouslyAsync()
 {         
     await Task.Delay(10000);
     return "Finished";
 }

推荐答案

您正在使用.NET4.那时，还没有Task.Delay.但是，有一个图书馆 微软称 Microsoft.Bcl.Async ，它提供了另一种选择:TaskEx.Delay.

You are using .NET 4. Back then, there was no Task.Delay. However, there was a library by Microsoft called Microsoft.Bcl.Async, and it provides an alternative: TaskEx.Delay.

它会这样使用:

public async Task<string> WaitAsynchronouslyAsync()
{         
    await TaskEx.Delay(10000);
    return "Finished";
}

您的其他选择是更新到.NET 4.5，还是自己实施:

Your other options are to either update to .NET 4.5, or just implement it yourself:

public static Task Delay(double milliseconds)
{
    var tcs = new TaskCompletionSource<bool>();
    System.Timers.Timer timer = new System.Timers.Timer();
    timer.Elapsed += (o, e) => tcs.TrySetResult(true);
    timer.Interval = milliseconds;
    timer.AutoReset = false;
    timer.Start();
    return tcs.Task;
}

(摘自Servy的回答此处).

(taken from Servy's answer here).

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