Question

我有这段代码：

public async Task DoRespond(AspNetWebSocketContext context)
        {
            System.Net.WebSockets.WebSocket socket = context.WebSocket;
            while (true)
            {
                ArraySegment<byte> buffer = new ArraySegment<byte>(new byte[1024]);
                WebSocketReceiveResult result = await socket.ReceiveAsync(buffer, CancellationToken.None);
                if (socket.State == WebSocketState.Open)
                {
                    string userMessage = Encoding.UTF8.GetString(buffer.Array, 0, result.Count);
                    userMessage = "Message from client : " + userMessage;
                    buffer = new ArraySegment<byte>(Encoding.UTF8.GetBytes(userMessage));
                    await socket.SendAsync(buffer, WebSocketMessageType.Text, true, CancellationToken.None);
                }
                else
                {
                    break;
                }
            }

我需要在bool方法的不同类中调用这个异步方法（它是一个NUnit框架）

protected override bool Test()
{
    Websocket ws = new Websocket();
    ws.ProcessRequest(context);
    Thread.Sleep(1000);
    logger.Write("Async method ");
    var task = Task.Run(DoRespond);
}

我需要在这个bool方法中调用async Task方法。我怎么能这样做？我还需要调用一个参数AspNetWebSocketContext上下文。

Answer 1

async..await模式具有传染性，并将通过您的代码库传播。

要调用async方法，您需要await另一个async方法

protected override async Task<bool> Test()
{
    using (Websocket ws = new Websocket()) // properly dispose of WebSocket
    {
        ws.ProcessRequest(context);
        await Task.Delay(1000); // notice the awaitable Delay replacing the blocking Sleep.
        logger.Write("Async method ");
        await DoRespond(context);
    }

    return true; // not sure where Boolean return value comes from as it wasn't in original method.
}

当然，无论调用Test()，都会得到类似的处理。

在评论中提供更多信息后进行修改

可以强制测试方法等待async方法完成，类似于

protected override bool Test()
{
    using (Websocket ws = new Websocket()) // properly dispose of WebSocket
    {
        ws.ProcessRequest(context);
        Thread.Sleep(1000);
        logger.Write("Async method ");

        var task = DoRespond(context);
        task.Wait(); // wait for async method to complete

        // assert something?
    }

    return true; // not sure where Boolean return value comes from as it wasn't in original method.
}

但是，请阅读使用NUnit的异步测试，因为async测试方法（如第一个示例）已支持多年。

进一步阅读，Async Support in NUnit

我如何在不同的类中调用异步方法？

1 个答案: