SignalR指定用户推送

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添加SignalR推送官方文档：
https://docs.microsoft.com/zh-cn/aspnet/core/signalr/groups?view=aspnetcore-5.0

项目安装Microsoft.AspNetCore.SignalR包

配置集线器类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.SignalR;namespace WebNetCore5_Img_Storage.Handler
{//继承IUserIdProvider用于告诉SignalR连接用谁来绑定用户idpublic class GetUserId : IUserIdProvider{string IUserIdProvider.GetUserId(HubConnectionContext connection){//获取当前登录用户idstring userid = connection.GetHttpContext().Session.GetString("user_id");return userid;}}public class ChatHub : Hub{public async Task SendMessage(string user, string message){await Clients.All.SendAsync("ReceiveMessage", user, message);}//特定用户推送消息public async Task SendPrivateMessage(string user, string message){await Clients.User(user).SendAsync("ReceiveMessage", message);}}
}

C#推送代码

 public class FileUploadController : BaseController{private readonly IHubContext<ChatHub> hubContext;public FileUploadController(IHubContext<ChatHub> _hubContext){        hubContext = _hubContext;}public async Task<ActionResult> UploadBigFile(IFormFile file)
{//当前登录用户idstring loginUserId=Current.Id;//后台上传进度decimal process = Math.Round((decimal)fileNo * 100 / total_minio_file_count, 2);	 //推送消息到前端hubContext.Clients.User(loginUserId).SendAsync("ReceiveMessage", loginUserId, process);								
}

配置启动类注册IUserIdProvider的实例

   // This method gets called by the runtime. Use this method to add services to the container.public void ConfigureServices(IServiceCollection services){//解决中文输出后被编码了services.Configure<Microsoft.Extensions.WebEncoders.WebEncoderOptions>(options =>{options.TextEncoderSettings = new System.Text.Encodings.Web.TextEncoderSettings(System.Text.Unicode.UnicodeRanges.All);});//services.AddControllersWithViews();//添加全局筛选器：services.AddControllersWithViews(options =>{options.Filters.Add(typeof(CustomExceptionFilter));})//自定义格式化json使用Newtonsoft.Json.AddNewtonsoftJson();//services.addNewservices.AddRazorPages();//session配置缓存组件依赖，分布式缓存//services.AddDistributedMemoryCache();//会话存活时间，单位（秒）int sessionTime = 0;int.TryParse(MyConfigReader.GetConfigValue("session_live_time"), out sessionTime);if (sessionTime == 0){sessionTime = 7200;}services.AddSession(options =>{//设置cookie名称//options.Cookie.Name = ".AspNetCore.Session";//会话滑动过期时间，距下次访问最小时间，超过则session失效options.IdleTimeout = TimeSpan.FromSeconds(sessionTime);options.Cookie.HttpOnly = true;options.Cookie.IsEssential = true;});//业务层注入  //services.AddScoped<IImgBLL, ImgBLLImpl>();string path = AppDomain.CurrentDomain.BaseDirectory;Assembly bll_impl = Assembly.LoadFrom(path + "WebNetCore5_Img_Storage.BLL.dll");Assembly bll_interface = Assembly.LoadFrom(path + "WebNetCore5_Img_Storage.IBLL.dll");var typesInterface = bll_interface.GetTypes();var typesImpl = bll_impl.GetTypes();foreach (var item in typesInterface){var name = item.Name.Substring(1);string implBLLImpName = name + "Impl";var impl = typesImpl.FirstOrDefault(w => w.Name.Equals(implBLLImpName));if (impl != null){//services.AddTransient(item, impl);//services.AddSingleton(item, impl);services.AddScoped(item, impl);}}//数据层注册Assembly dalAssemblys = Assembly.LoadFrom(path + "WebNetCore5_Img_Storage.DAL.dll");Assembly dalInterface = Assembly.LoadFrom(path + "WebNetCore5_Img_Storage.IDAL.dll");var dalTypesImpl = dalAssemblys.GetTypes();var dalTypesInterface = dalInterface.GetTypes();foreach (var item in dalTypesInterface){var name = item.Name.Substring(1);string implDalName = name + "Impl";var impl = dalTypesImpl.FirstOrDefault(w => w.Name.Equals(implDalName));if (impl != null){//services.AddTransient(item, impl);services.AddScoped(item, impl);}}services.AddMvcCore();//用户IUserIdProvider实例注册services.AddScoped<Microsoft.AspNetCore.SignalR.IUserIdProvider, GetUserId>();//SignalR添加到服务services.AddSignalR();}public void Configure(IApplicationBuilder app, IWebHostEnvironment env){if (env.IsDevelopment()){app.UseDeveloperExceptionPage();}else{app.UseExceptionHandler("/Error");}app.UseHttpsRedirection();app.UseStaticFiles(new StaticFileOptions(){//不限制content-type下载ServeUnknownFileTypes = true,配置的虚拟路径映射//RequestPath = "/local",物理地址//FileProvider = new Microsoft.Extensions.FileProviders.PhysicalFileProvider("D:\\Work\\西南油气田图库系统\\WebNetCore5_Img_Storage\\WebNetCore5_Img_Storage\\bin\\Debug\\net5.0"),});app.UseRouting();//app.UseAuthentication();app.UseAuthorization();app.UseSession();//app.UseResponseCaching();//app.UseResponseCompression();//用MVC模式, 针对services的services.AddControllersWithViews();app.UseEndpoints(endpoints =>{//endpoints.MapDefaultControllerRoute();endpoints.MapRazorPages();endpoints.MapControllerRoute(name: "default",pattern: "{controller=Home}/{action=Index}/{id?}");endpoints.MapHub<ChatHub>("/chathub");});

前端界面js代码

    <script src="~/lib/microsoft/signalr/dist/browser/signalr.min.js"></script>//signalR推送消息，用于显示后台实时处理进度var connection = new signalR.HubConnectionBuilder().withUrl("/chatHub").build();connection.on("ReceiveMessage", function (user, message) {console.log("user=" + user + ",message=" + message);//后台上传视频到文件系统进度值$("#back_process_value").html(message+"%");});connection.start().then(function () {console.log("signalR推送连接成功");}).catch(function (err) {console.error("signalR推送连接异常");return console.error(err.toString());});//document.getElementById("sendButton").addEventListener("click", function (event) {//    var user = document.getElementById("userInput").value;//    var message = document.getElementById("messageInput").value;//    connection.invoke("SendMessage", user, message).catch(function (err) {//        return console.error(err.toString());//    });//    event.preventDefault();//});

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