C# websocketserver如何搭建

要搭建一个C# WebSocket 服务器，可以使用ASP.NET Core框架来实现。以下是一个简单的示例代码：

using System;
using System.Net;
using System.Net.WebSockets;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;

public class Startup
{
    public void Configure(IApplicationBuilder app)
    {
        app.UseWebSockets();
        app.Use(async (context, next) =>
        {
            if (context.WebSockets.IsWebSocketRequest)
            {
                WebSocket webSocket = await context.WebSockets.AcceptWebSocketAsync();
                await Echo(context, webSocket);
            }
            else
            {
                await next();
            }
        });
    }

    private async Task Echo(HttpContext context, WebSocket webSocket)
    {
        var buffer = new byte[1024];
        WebSocketReceiveResult result = await webSocket.ReceiveAsync(new ArraySegment(buffer), CancellationToken.None);

        while (!result.CloseStatus.HasValue)
        {
            await webSocket.SendAsync(new ArraySegment(buffer, 0, result.Count), result.MessageType, result.EndOfMessage, CancellationToken.None);

            result = await webSocket.ReceiveAsync(new ArraySegment(buffer), CancellationToken.None);
        }

        await webSocket.CloseAsync(result.CloseStatus.Value, result.CloseStatusDescription, CancellationToken.None);
    }
}

public class Program
{
    public static void Main(string[] args)
    {
        CreateWebHostBuilder(args).Build().Run();
    }

    public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
        WebHost.CreateDefaultBuilder(args)
            .UseStartup();
}

在这个示例中，我们创建了一个ASP.NET Core的Startup类，配置了一个WebSocket中间件来处理WebSocket请求。在Echo方法中实现了一个简单的Echo服务器，收到客户端消息后直接将消息原样返回给客户端。

要运行这个WebSocket服务器，可以在项目文件夹下执行以下命令：

dotnet run

这将启动一个本地的WebSocket服务器，可以通过WebSocket客户端连接到它。