通过超时取消C#4.5 TcpClient ReadAsync [英] Cancel C# 4.5 TcpClient ReadAsync by timeout

问题描述

通过超时取消TcpClient ReadAsync操作并在.NET 4.5中捕获此超时事件的正确方法是什么?

What would the proper way to cancel TcpClient ReadAsync operation by timeout and catch this timeout event in .NET 4.5?

TcpClient.ReadTimeout似乎已应用于同步只读.

TcpClient.ReadTimeout seems to be applied to the sync Read only.

更新:
尝试使用此处描述的方法取消异步操作

var buffer = new byte[4096];
CancellationTokenSource cts = new CancellationTokenSource(5000);
int amountRead = await tcpClientStream.ReadAsync(buffer, 0, 4096, cts.Token);

，但它永远不会因超时而取消.有什么事吗?

but it never cancels by timeout. Is anything wrong?

推荐答案

所以我知道那是很长一段时间了但是谷歌仍然把我带到这里我看到没有标记为答案

so I know that was from a long time but google still drive me here and I saw there is none marked as answer

对我来说，我这样解决我进行了扩展以添加需要额外超时的方法ReadAsync

for me, I solve like that I make an extension to add a method ReadAsync that takes extra timeout

public static async Task<int> ReadAsync(this NetworkStream stream, byte[] buffer, int offset, int count, int TimeOut)
{
    var ReciveCount = 0;
    var receiveTask = Task.Run(async () => { ReciveCount = await stream.ReadAsync(buffer, offset, count); });
    var isReceived = await Task.WhenAny(receiveTask, Task.Delay(TimeOut)) == receiveTask;
    if (!isReceived) return -1;
    return ReciveCount;
}

因此，如果返回-1，则表示读取超时

so if it returned -1 that mean the read timed out

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