C# System.Threading.Task 不包含定义
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System.Threading.Task does not contain definition
提问by Villapando Cedric
I cant have .Delay definition on my System.Threading.Task.
我的 System.Threading.Task 上不能有 .Delay 定义。
public async Task<string> WaitAsynchronouslyAsync()
{
await Task.Delay(10000);
return "Finished";
}
采纳答案by It'sNotALie.
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.
您使用的是 .NET 4。那时，还没有Task.Delay. 然而，微软有一个名为Microsoft.Bcl.Async的库，它提供了一个替代方案：TaskEx.Delay.
It would be used like this:
它将像这样使用：
public async Task<string> WaitAsynchronouslyAsync()
{
await TaskEx.Delay(10000);
return "Finished";
}
Your other options are to either update to .NET 4.5, or just implement it yourself:
您的其他选择是更新到 .NET 4.5，或者自己实现：
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;
}
(taken from Servy's answer here).
（取自Servy的回答here）。
回答by Marc Gravell
If I interpret the question correctly, it sounds like you are simply using .NET 4.0; Task.Delaywas added in .NET 4.5. You can either add your own implementation using something like a system timer callback and a TaskCompletionSource, or: just update to .NET 4.5
如果我正确解释了这个问题，听起来您只是在使用 .NET 4.0；Task.Delay是在 .NET 4.5 中添加的。您可以使用系统计时器回调和TaskCompletionSource, 之类的东西添加自己的实现，或者：只需更新到 .NET 4.5
