c# 在 websocket 中访问 session

今天的项目需要用到websocket，但是中websocket中无法直接访问session，一访问session就出错，断开连接。

找了老半天百度也没有相关c#的介绍和方法，没办法，找不到现成的代码，只能自己动手了，

websocket握手时是一个完整的http协议的，发现里面有发送cookie:ASP.NET_SessionId，好了，废话少说，上测试

新建一个WebApi控制器

     public class WebApiTestController : ApiController
     {
         public HttpResponseMessage Get()
         {
             if (HttpContext.Current.IsWebSocketRequest)
             {
                 var user = (SysUser.UserInfoClass)HttpContext.Current.Session["user"];//此外是用户session，调试发现获取成功             }
             return new HttpResponseMessage(HttpStatusCode.SwitchingProtocols);
         }
     ｝

客户端js代码

 <script type="text/javascript">
     var ws = new WebSocket("ws://" + window.location.hostname + ":" + window.location.port + "/api/WebApiTest/");
 </script>

验证成功，下面完善整个代码：

客户端js：

 <!DOCTYPE html>

 <html>
 <head>
     <meta name="viewport" content="width=device-width" />
     <title>WebSocket</title>
     <script type="text/javascript" src="~/scripts/jquery.js"></script>
 </head>
 <body>
     <fieldset>
         <input type="button" value="Connect" id="btnConnect" />
         <input type="button" value="DisConnect" id="btnDisConnect" />
         <hr />
         <input type="text" id="txtInput" />
         <input type="button" value="Send" id="btnSend" />
         <br />
         <span id="messageSpan" style="color:red;"></span>
     </fieldset>
 </body>
 </html>
 <script type="text/javascript">
     var ws;
     $("#btnConnect").click(function () {
         $("#messageSpan").text("Connection...");
         ws = new WebSocket("ws://" + window.location.hostname + ":" + window.location.port + "/api/WebApiTest/");
         ws.onopen = function () {
             $("#messageSpan").text("Connected!");
         };
         ws.onmessage = function (result) {
             $("#messageSpan").text(result.data);
         };
         ws.onerror = function (error) {
             $("#messageSpan").text(error.data);
         };
         ws.onclose = function () {
             $("#messageSpan").text("Disconnected!");
         };
     });
     $("#btnSend").click(function () {
         ws.protocol
         if (ws.readyState == WebSocket.OPEN) {
             ws.send($("#txtInput").val());
         }
         else {
             $("messageSpan").text("Connection is Closed!");
         }
     });
     $("#btnDisconnect").click(function () {
         ws.close();
     });
 </script> 

服务器端（mvc.net）

     public class WebApiTestController : ApiController
     {
         public HttpResponseMessage Get()
         {
             if (HttpContext.Current.IsWebSocketRequest)
             {
                 var user = (Api_System.JsonClass.SysUser.UserInfoClass)HttpContext.Current.Session["user"];
                 var ooo = new Func<AspNetWebSocketContext, Task>((x) => ProcessWSChat(x, user));
                 HttpContext.Current.AcceptWebSocketRequest(ooo);
             }
             return new HttpResponseMessage(HttpStatusCode.SwitchingProtocols);
         }

         private async Task ProcessWSChat(AspNetWebSocketContext arg, SysUser.UserInfoClass user)
         {
             WebSocket socket = arg.WebSocket;
             while (true)
             {
                 ArraySegment<byte> buffer = new ArraySegment<byte>(new byte[]);
                 WebSocketReceiveResult result = await socket.ReceiveAsync(buffer, CancellationToken.None);
                 if (socket.State == WebSocketState.Open)
                 {
                     //客户端发送来的信息
                     string message = Encoding.UTF8.GetString(buffer.Array, , result.Count);
                     string returnMessage = " You send :" + message + ". and the user is [" + user.UserName + "] at " + DateTime.Now.ToLongTimeString();
                     buffer = new ArraySegment<byte>(Encoding.UTF8.GetBytes(returnMessage));
                     await socket.SendAsync(buffer, WebSocketMessageType.Text, true, CancellationToken.None);
                 }
                 else
                 {
                     break;
                 }
             }
         }
     }