1、效果图

2、后台代码：

public void Demo() {            //return "Hello World";            HttpContextBase content = this.HttpContext;            content.AcceptWebSocketRequest(ProcessChat);            //return "I am a beautiful girl";        }        private async Task ProcessChat(AspNetWebSocketContext context)        {            //HttpContextBase  content = this.HttpContext;            WebSocket socket = context.WebSocket;            while (true)            {                if (socket.State == WebSocketState.Open)                {                    ArraySegment
     
       buffer = new ArraySegment
      
       (new byte[2048]);                    WebSocketReceiveResult result = await socket.ReceiveAsync(buffer, CancellationToken.None);                    string userMsg = Encoding.UTF8.GetString(buffer.Array, 0, result.Count);                    userMsg = "你发送了：" + userMsg + "于" + DateTime.Now.ToLongTimeString();                    buffer = new ArraySegment
       
        (Encoding.UTF8.GetBytes(userMsg));                    await socket.SendAsync(buffer, WebSocketMessageType.Text, true, CancellationToken.None);                }                else                {                    break;                }            }        }    }
       
      
     

3、前端代码

@{    ViewBag.Title = "Home Page";}            
     
    
      
        
       
            
                    
                    
                    
                    
                
       
    
      
   
     

4、总结：看网上Websocket的实例后台一般都是ashx的样例，研究了好久才知道mvc的action也可以写成websocket。非常感谢eleven老师的指导。让我今天对websocket有了一定的了解，并且有信心坚持下去。也谢谢这位大牛的文章，让我解决了问题

https://stackoverflow.com/questions/40074190/websocket-connection-to-ws-localhost2017-failed-invalid-frame-header

 还有这个文章

http://www.cnblogs.com/langu/archive/2013/12/22/3485676.html

感谢帮助过我的朋友们