前言
最近在项目中用到了 SSE (Server-Sent Events),用于服务的单向长连接数据推送。因为都是使用 C# 实现的,所以服务端使用的是 HttpListener ,而客户端更简单,只使用了 HttpClient ,连接了之后就一直读流,一旦流读取错误或超时,则尝试重连接。
有感于这种方式简单便捷,便一直一条路走到黑(中间踩了坑),对它进行不断打磨。最后,设计出了一款主打轻量级、兼顾性能、易扩展、开箱即用的纯 C# 实现的 SSE 工具包------ TinyHttpSSE.DotNet ,并已经开源。
简介
TinyHttpSSE.DotNet 在 github 有着详细的介绍,在此仅介绍 SSE。
Server-Sent Events(SSE)是一种基于 HTTP 协议的服务器推送技术,它允许服务器以流的方式向客户端实时推送数据。意味着支持SSE 的浏览器有着对应的支持------EventSource,所以实现 SSE 的 服务端都能与浏览器无缝衔接。
以下,我将基于 TinyHttpSSE.DotNet 和 asp.net core razor 实现一个比分直播的 Demo。
比赛得分Live Demo
- 创建项目 asp.net core razor ,添加 nuget 包------ TinyHttpSSE.DotNet.Server


- 修改 Program.cs ,设置 HttpSseServer 单例依赖注入,并添加 SseServerHostdService
Program.cs:
var builder = WebApplication.CreateBuilder(args);
// Add services to the container.
builder.Services.AddSingleton((service) => {
var config=service.GetService<IConfiguration>();
//SseServerUrl:http://+:9111/msg/
return new HttpSseServer(config.GetValue<string>("SseServerUrl"));
});
builder.Services.AddHostedService<SseServerHostdService>();
builder.Services.AddRazorPages();
var app = builder.Build();
SseServerHostdService.cs:
public class SseServerHostdService : IHostedService
{
private readonly HttpSseServer _server;
public SseServerHostdService(HttpSseServer httpSseServer) {
_server = httpSseServer;
}
public async Task StartAsync(CancellationToken cancellationToken) {
await Task.Run(() => {
bool result= _server.Start();
});
}
public async Task StopAsync(CancellationToken cancellationToken) {
await _server.Stopping();
}
}
- 修改 Index.cshtml ,实现 EventSource,成为比分直播页面
Index.cshtml:
@page
@model IndexModel
@{
ViewData["Title"] = "Home page";
}
@section Scripts{
<script>
const eventSource = new EventSource("http://127.0.0.1:9111/msg/");
eventSource.onmessage = function (event) {
if (event.data) {
//document.getElementById('content').innerHTML += event.data ;
const status = JSON.parse(event.data);
document.getElementById('score1').innerHTML = status.score1;
document.getElementById('score2').innerHTML = status.score2;
if (status.lastaction) {
document.getElementById('content').innerHTML += status.lastaction;
}
}
}
</script>
}
<div class="text-center">
<h1 class="display-4">Welcome</h1>
<div style="font-size:40px">
<p >
<span id="score1">0</span>
<span>-</span>
<span id="score2">0</span>
</p>
</div>
<div id="content" style="width:800px;height:600px;overflow:scroll;">
</div>
</div>
4.创建 Manage.cshtml 页面,比分输入功能:
Manage.cshtml:
@page
@model CompetitionLive.Pages.ManageModel
@{
}
<form method="post">
<p>
<label for="number" asp-for="Score1"></label>
<input type="number" asp-for="Score1" id="score1" />
</p>
<p>
<label for="number" asp-for="Score2"></label>
<input type="number" asp-for="Score2" />
</p>
<p>
<label for="text2" asp-for="LastAction"></label>
<input type="text" asp-for="LastAction" />
</p>
<p><input type="submit" /></p>
</form>
Manage.cshtml.cs:
public class ManageModel : PageModel
{
private readonly HttpSseServer _httpSseServer;
public ManageModel( HttpSseServer httpSseServer) {
_httpSseServer = httpSseServer;
}
public int Score1 { get; set; } = 0;
public int Score2 { get; set; } = 0;
public string LastAction { get; set; }
public void OnGet()
{
}
public void OnPost(int score1,int score2,string lastAction) {
Dictionary<string, object> dict = new Dictionary<string, object>();
dict["score1"] = score1;
dict["score2"] = score2;
dict["lastaction"] = lastAction+"<br />";
_httpSseServer.StreamManagement.All.PushSseMsg(Newtonsoft.Json.JsonConvert.SerializeObject(dict));
}
}
5.启动运行
效果: