小编jbh*_*con的帖子

我正在努力解开C#异步编程,下面的模式显然是错误的,但是我不明白.我打算做的就是解雇n个任务,然后等待它们全部完成.当我明白我感到困惑时,我开始将事情提炼下来,并最终创造了这个:

    private async Task<bool> doLoop()
    {
        int loopCnt = 3;
        int[] sleeperReturns = new int[loopCnt + 1];
        for (int i = 0; i < loopCnt; i++)
        {
            System.Diagnostics.Debug.WriteLine("doLoop: i={0} calling Sleeper", i);
            Task.Run(async () => { sleeperReturns[i] = await sleep(i); });
            System.Diagnostics.Debug.WriteLine("doLoop: i={0} called  Sleeper", i);
        }
        return true;
    }

    private async Task<int> sleep(int i)
    {
        System.Diagnostics.Debug.WriteLine("Sleep: begins i={0}", i);
        await Task.Delay(5000 + i * 1000);
        System.Diagnostics.Debug.WriteLine("Sleep: ends   i={0}", i);
        return i;
    }

这会产生以下输出:

doLoop: i=0 calling Sleeper
doLoop: i=0 …