ClientWebSocket-SocketException:无法建立连接

问题描述

我正在尝试使用ClientWebSocket连接到WebSocket服务器(演示或本地主机).我有一个例外:

I am trying to connect to WebSocket server (demo or localhost) using ClientWebSocket.I get an exception:

System.Net.WebSockets.WebSocketException
  HResult=0x80004005
  Message=Unable to connect to the remote server
  Source=System.Net.WebSockets.Client
  StackTrace:

Inner Exception 1:
HttpRequestException: No connection could be made because the target machine actively refused it

Inner Exception 2:
SocketException: No connection could be made because the target machine actively refused it

我也有成功连接的JavaScript websocket客户端.为什么我无法使用ClientWebSocket进行连接?

I also have JavaScript websocket client which connected succefully. Why I can't connect using ClientWebSocket?

using System;
using System.Net.WebSockets;
using System.Threading;
using System.Threading.Tasks;
using StreamJsonRpc;

namespace ConsoleApp1
{
    class Program
    {
        static async Task Main(string[] args)
        {
            Console.WriteLine("Hello World!");
            try
            {
                Console.WriteLine("Press Ctrl+C to end.");
                //await ConnectAsync("ws://localhost:63762/ws");
                await ConnectAsync("ws://demos.kaazing.com/echo");
                
            }
            catch (Exception ex)
            {
                  Console.WriteLine(ex);
                  Console.ReadKey();
            }
        }

        static async Task ConnectAsync(string url)
        {
            using (var socket = new ClientWebSocket())
            {
                Console.WriteLine("---> JSON-RPC Client connecting to " + url);

                await socket.ConnectAsync(new Uri(url), CancellationToken.None);
                Console.WriteLine("-> Connected to web socket. Establishing JSON-RPC protocol...");
                                                         
            }

        }
    }
}

推荐答案

更新24/07

如果是这样，那就没有意义了.它对我有效.

If so, it doesn't make sense. It works on me.

.net 控制台应用程序中有 ws 客户端的代码.

There are codes of ws client in .net console application.

    static async Task Main(string[] args)
    {
        Console.WriteLine("Hello World!");
        
        try
        {
            Console.WriteLine("Press Ctrl+C to end.");
            await ConnectAsync("ws://localhost:8080");
            //await ConnectAsync("ws://demos.kaazing.com/echo");

            Console.ReadLine();
        }
        catch (OperationCanceledException)
        {
            // This is the normal way we close.
        }

    }

    static async Task ConnectAsync(string url)
    {
        using (var socket = new ClientWebSocket())
        {
            Console.WriteLine("---> JSON-RPC Client connecting to " + url);

            await socket.ConnectAsync(new Uri(url), CancellationToken.None);
            Console.WriteLine("-> Connected to web socket. Establishing JSON-RPC protocol...");


            await Send(socket, "Hello from client.");
            await Receive(socket);

            await socket.CloseAsync(WebSocketCloseStatus.NormalClosure, "close", CancellationToken.None);

        }

    }

    static async Task Send(ClientWebSocket socket, string data) =>
await socket.SendAsync(Encoding.UTF8.GetBytes(data), WebSocketMessageType.Text, true, CancellationToken.None);


    static async Task Receive(ClientWebSocket socket)
    {
        var buffer = new ArraySegment<byte>(new byte[2048]);
        do
        {
            WebSocketReceiveResult result;
            using (var ms = new MemoryStream())
            {
                do
                {
                    result = await socket.ReceiveAsync(buffer, CancellationToken.None);
                    ms.Write(buffer.Array, buffer.Offset, result.Count);
                } while (!result.EndOfMessage);

                if (result.MessageType == WebSocketMessageType.Close)
                    break;

                ms.Seek(0, SeekOrigin.Begin);
                using (var reader = new StreamReader(ms, Encoding.UTF8))
                    Console.WriteLine(await reader.ReadToEndAsync());
            }
        } while (true);
    }

我的 node.js 服务器上带有websocket的ws代码.

There are ws codes of my node.js server with websocket.

const WebSocket = require('ws')

const wss = new WebSocket.Server({ port: 8080 })

wss.on('connection', (ws) => {
  ws.on('message', (message) => {
    console.log(`Received message => ${message}`)
  })
  ws.send('Hello from server!')
})

console.log('Server running at ws://127.0.0.1:8080');

________________________________________________________________

ClientWebSocket 无法在Python中直接连接到 socket.io .

_______________________________________________________________

ClientWebSocket can not directly connect to socket.io in Python.

这里是 @Jim Stott的解决方案.在 CodePlex 上有一个项目( NuGet )，它也是 socket.io 的 C#客户端.

Here is a solution from @Jim Stott.There is a project on CodePlex ( NuGet as well ) that is a C# client for socket.io.

示例客户风格:

socket.On("news", (data) =>    {
Console.WriteLine(data);
});

下面的问题也有很多方法可以满足您的需求.
通过c#与socket.io服务器通信

And also there are many ways to meet your needs from the question below.
Communicating with a socket.io server via c#

此处是有关 WebSocket与Socket.io 的文章

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