SignalR

SignalR

https://docs.microsoft.com/zh-cn/aspnet/core/signalr/introduction?view=aspnetcore-3.1

1.SignalR是什么

ASP .NET SignalR 是一个ASP .NET 下的类库，可以在ASP .NET 的Web项目中实现实时通信。就是让客户端（Web页面）和服务器端可以互相通知消息及调用方法，当然这是实时操作的。

2.使用流程

官网例子：https://docs.microsoft.com/zh-cn/aspnet/core/tutorials/signalr?view=aspnetcore-3.1&tabs=visual-studio-code

1.环境要求：

• Visual Studio Code
• 用于 Visual Studio Code 的 C#（最新版本）
• .NET Core 3.0 SDK 或更高版本

2.在服务端创建SignalR 中心

using Microsoft.AspNetCore.SignalR;
using System.Threading.Tasks;

namespace SignalRChat.Hubs
{
    public class ChatHub : Hub
    {
        public async Task SendMessage(string user, string message)
        {
            await Clients.All.SendAsync("ReceiveMessage", user, message);
        }
    }
}

3.配置

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.HttpsPolicy;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using SignalRChat.Hubs;

namespace SignalRChat
{
    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.AddRazorPages();
            services.AddSignalR();
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            else
            {
                app.UseExceptionHandler("/Error");
                // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
                app.UseHsts();
            }

            app.UseHttpsRedirection();
            app.UseStaticFiles();

            app.UseRouting();

            app.UseAuthorization();

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapRazorPages();
                endpoints.MapHub<ChatHub>("/chathub");
            });
        }
    }
}

　　

4.客户端安装

vue 的安装方式

1. 首先安装 SignalR 的package，需要注意的是 SignalR 依赖 jQuery。
   npm i signalr jquery --save