WebSocket框架有很多，现在经常用到Supersocket,现在要封装一个dll,里面用到WebSocket,但是如果dll里面引用第三方框架的话，引用自己封装的dll时还需要引用一堆额外的包，这就显得有点臃肿，因为只有一个客户端的WebSocket用原生的ClientWebSocket即可；

官方文档：https://docs.microsoft.com/zh-cn/dotnet/api/system.net.websockets.clientwebsocket?view=netframework-4.7.2&f1url=%3FappId%3DDev16IDEF1%26l%3DZH-CN%26k%3Dk(System.Net.WebSockets.ClientWebSocket);k(TargetFrameworkMoniker-.NETFramework,Version%253Dv4.7.2);k(DevLang-csharp)%26rd%3Dtrue

连接并发送消息：

public static ClientWebSocket clientWebSocket;

        public static Uri serverUri;


        public SocketClient(string ip, int port)
        {var webSocketUrl = $@"ws://{ip}:{port}";
            clientWebSocket = new ClientWebSocket();
            serverUri = new Uri(webSocketUrl);
            clientWebSocket.ConnectAsync(serverUri, CancellationToken.None).Wait();
        }

        public async Task SendMessageAsync(string Msg)
        {
            if(clientWebSocket.State != WebSocketState.Open)
            {
                await clientWebSocket.ConnectAsync(serverUri, CancellationToken.None);
            }
            if (clientWebSocket.State == WebSocketState.Open)
            {
                ArraySegment<byte> bytesToSend = new ArraySegment<byte>(Encoding.UTF8.GetBytes(Msg));
                await clientWebSocket.SendAsync(bytesToSend, WebSocketMessageType.Text, true, CancellationToken.None);
            }
        }

接收消息

　　　　　　　　　　ArraySegment<byte> bytesReceived = new ArraySegment<byte>(new byte[1024]);
                WebSocketReceiveResult result = await ws.ReceiveAsync(bytesReceived, CancellationToken.None);
                Console.WriteLine(Encoding.UTF8.GetString(bytesReceived.Array, 0, result.Count));

ClientWebSocket里面的方法都是异步的，如果同步方法调用异步：

1.不需要获取返回值的：

clientWebSocket.ConnectAsync(serverUri, CancellationToken.None).Wait();

2.需要获取返回值的

var result = clientWebSocket.ConnectAsync(serverUri, CancellationToken.None).GetAwaiter().GetResult();