System.Net.Sockets.Tests.SocketOptionNameTest.FailedConnect_GetSocketOption_SocketOptionNameError C# (CSharp) Метод

        public void FailedConnect_GetSocketOption_SocketOptionNameError(bool simpleGet)
        {
            using (var client = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp) { Blocking = false })
            {
                // Fail a Connect
                using (var server = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp))
                {
                    server.Bind(new IPEndPoint(IPAddress.Loopback, 0)); // bind but don't listen
                    Assert.ThrowsAny<Exception>(() => client.Connect(server.LocalEndPoint));
                }

                // Verify via Select that there's an error
                const int FailedTimeout = 10 * 1000 * 1000; // 10 seconds
                var errorList = new List<Socket> { client };
                Socket.Select(null, null, errorList, FailedTimeout);
                Assert.Equal(1, errorList.Count);

                // Get the last error and validate it's what's expected
                int errorCode;
                if (simpleGet)
                {
                    errorCode = (int)client.GetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Error);
                }
                else
                {
                    byte[] optionValue = new byte[sizeof(int)];
                    client.GetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Error, optionValue);
                    errorCode = BitConverter.ToInt32(optionValue, 0);
                }
                Assert.Equal((int)SocketError.ConnectionRefused, errorCode);

                // Then get it again
                if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
                {
                    // The Windows implementation doesn't clear the error code after retrieved.
                    // https://github.com/dotnet/corefx/issues/8464
                    Assert.Equal(errorCode, (int)client.GetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Error));
                }
                else
                {
                    // The Unix implementation matches the getsockopt and MSDN docs and clears the error code as part of retrieval.
                    Assert.Equal((int)SocketError.Success, (int)client.GetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Error));
                }
            }
        }