.net core websocket

1. 参考资料

官网 WebSocket 使用简要说明

官网 WebSocket API

使用 WebSocket 中间件 

2. 程序A : 没有使用中间件  (https://www.cnblogs.com/u-drive/p/9833634.html)

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using System;
using System.Net.WebSockets;
using System.Threading;
using System.Threading.Tasks;

namespace AspNetCoreWithWebSocketDemo
{
    public class Startup
    {
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        public IConfiguration Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddMvc();
        }
        public void Configure(IApplicationBuilder app, IHostingEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseBrowserLink();
                app.UseDeveloperExceptionPage();
            }
            else
            {
                app.UseExceptionHandler("/Home/Error");
            }
            app.UseStaticFiles();
            //Be sure to configure before mvc middleware.
            app.UseWebSockets();
            app.Use(async (context, next) =>
            {
                if (context.WebSockets.IsWebSocketRequest)
                {
                    using (IServiceScope scope = app.ApplicationServices.CreateScope())
                    {
                        WebSocket webSocket = await context.WebSockets.AcceptWebSocketAsync();
                        Console.WriteLine("接收到玩家链接" + context.Request.HttpContext.Connection.RemoteIpAddress.ToString());
                        //The AcceptWebSocketAsync method upgrades the TCP connection to a WebSocket connection and provides a WebSocket object. Use the WebSocket object to send and receive messages
                        await Echo(context, webSocket);
                    }
                }
                else
                {
                    //Hand over to the next middleware
                    await next();
                }
            });
            app.UseMvc(routes =>
            {
                routes.MapRoute(
                    name: "default",
                    template: "{controller=Home}/{action=Index}/{id?}");
            });
        }

        private async Task Echo(HttpContext context, WebSocket webSocket) //Echo 响应的意思
        {
            var buffer = new byte[1024 * 4];
            WebSocketReceiveResult result = await webSocket.ReceiveAsync(new ArraySegment<byte>(buffer), CancellationToken.None);
            string receiveText = System.Text.Encoding.Default.GetString(buffer);
            Console.WriteLine($"收到客户端的信息 {context.Request.HttpContext.Connection.RemoteIpAddress}:{context.Request.HttpContext.Connection.RemotePort} {receiveText}" );
            while (!result.CloseStatus.HasValue)
            {
                string s = DateTime.Now.ToString();
                byte[] sendContext = System.Text.Encoding.Default.GetBytes(s);
                //await webSocket.SendAsync(new ArraySegment<byte>(buffer, 0, result.Count), result.MessageType, result.EndOfMessage, CancellationToken.None);
                await webSocket.SendAsync(new ArraySegment<byte>(sendContext, 0, sendContext.Length), WebSocketMessageType.Text, true, CancellationToken.None);
                result = await webSocket.ReceiveAsync(new ArraySegment<byte>(buffer), CancellationToken.None);
            }
            await webSocket.CloseAsync(result.CloseStatus.Value, result.CloseStatusDescription, CancellationToken.None);
            Console.WriteLine($"客户端断开链接");
        }
    }
}

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