如何在服务器监听端点之前调用该方法，使C＃套接字客户端方法`Socket.ConnectAsync（）`等待服务器？ [英] How to make C# socket client method `Socket.ConnectAsync()` wait for server if that method is called before server is listening on the endpoint?

问题描述

在C＃.NET中，我试图避免在套接字服务器绑定到&之前套接字客户端尝试连接到端点的竞争条件。监听该端点。



实现此目的的一种方法是，如果客户端在服务器侦听端点之前尝试调用`connect（）`方法，客户端无限期等待，直到服务器正在监听。



查看[命名管道文档] [1]，我看到`NamedPipeClientStream.ConnectAsync（）`方法将"异步连接到具有**无限超时**周期的等待服务器"。是的，这就是我想要的。



但是查看[套接字文档] [2]，使用`Socket.ConnectAsync（）`方法，没有似乎是一种设置超时期限的方法。编写一个测试程序，我看到如果客户端事实上
在服务器监听端点之前尝试连接，则会抛出`EADDRNOTAVAIL` [（Linux error 99）] [3]。



**有没有办法让`Socket.ConnectAsync（）`方法等待套接字服务器监听端点而不是只抛出异常？**



  [1]：https：//docs.microsoft.com/en-us/dotnet/api/system.io.pipes.namedpipeclientstream.connectasync？view = networkwork4.8

  [2]：https：//docs.microsoft.com/en-us/dotnet/api/system.net.sockets.socket.connectasync？view = networkwork-4.8＃System_Net_Sockets_Socket_ConnectAsync_System_Net_Sockets_SocketAsyncEventArgs_

  [3]：https：//mariadb.com/kb/en/library/operating-system-error-codes/

In C# .NET, I'm attempting to avoid a race condition where a socket client tries to connect to an endpoint before a socket server is bound to & listening on that endpoint.

One way to accomplish this is, if the client attempts to call a `connect()` method before the server is listening on the endpoint, the client waits indefinitely until the server is listening.

Looking in [documentation on Named Pipes][1], I see that `NamedPipeClientStream.ConnectAsync()` method will "asynchronously connect to a waiting server with an **infinite timeout** period". Yes, that's what I want.

However looking in [documentation on Sockets][2], using the `Socket.ConnectAsync()` method, there doesn't seem to be a way to set a timeout period. Writing a test program, I see that `EADDRNOTAVAIL` [(Linux error 99)][3] is thrown if the client does in fact attempt to connect before the server is listening to the endpoint.

**Is there any way to make the `Socket.ConnectAsync()` method wait for a socket server to listen to an endpoint instead of just throwing an exception?**

  [1]: https://docs.microsoft.com/en-us/dotnet/api/system.io.pipes.namedpipeclientstream.connectasync?view=netframework-4.8
  [2]: https://docs.microsoft.com/en-us/dotnet/api/system.net.sockets.socket.connectasync?view=netframework-4.8#System_Net_Sockets_Socket_ConnectAsync_System_Net_Sockets_SocketAsyncEventArgs_
  [3]: https://mariadb.com/kb/en/library/operating-system-error-codes/

推荐答案

嗨Member0422，

Hi Member0422,

感谢您在此发帖。

对于您的问题，您可以尝试以下建议。

For your question, you could try the suggestion below.

var tsk = client.ConnectAsync(host, port);
tsk.Wait(5000);//set the time

有关详细信息，请参阅以下链接。

For more details, you could refer to the link below.

https://stackoverflow.com/questions/18486585/tcpclient -connectasync-get-status

最好的问候，

Wendy

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