服务端SignalR支持

// 加入signalR，需要cors支持
builder.Services.AddSignalR();
string[] urls = { "http://localhost:3000" };
builder.Services.AddCors(options =>
{
    options.AddDefaultPolicy(builder => builder.WithOrigins(urls)
    .AllowAnyMethod().AllowAnyHeader().AllowCredentials());
});

app.UseCors();
app.MapHub<MyChatHub>("/hubs/chatroomhub");

    public class MyChatHub : Hub
    {
        public Task SendPublicMessage(string message)
        {
            string connId = Context.ConnectionId;
            string msg = $"{connId} {DateTime.Now}:{message}";

            return Clients.All.SendAsync("PublicMessageReceived", msg);
        }
    }

client端SignalR支持

. 使用yarn管理包，Vue作为client端框架

yarn create @vitejs/app chatroom
npm install @microsoft/signalr

yarn
yarn dev

<template>
  <div>
    <input type="text" v-model="state.userMessage" v-on:keypress="txtMsgOnkeypress" />
    <ul>
      <li v-for="(msg,index) in state.messages" :key="index">{{msg}}</li>
    </ul>
  </div>
</template>


<script>
import { reactive, onMounted } from "vue";
import * as signalR from "@microsoft/signalr";

let connection;

export default {
  name: "Login",
  setup() {
    const state = reactive({ userMessage: "", messages: [] });
    const txtMsgOnkeypress = async function (e) {
      if (e.keyCode != 13) return;
      await connection.invoke("SendPublicMessage", state.userMessage);
      state.userMessage = "";
    };

    onMounted(async function () {
      connection = new signalR.HubConnectionBuilder()
        .withUrl("https://localhost:7115/hubs/chatroomhub")
        .withAutomaticReconnect()
        .build();

      await connection.start();
      connection.on("PublicMessageReceived", (msg) => {
        state.messages.push(msg);
      });
    });

    return { state, txtMsgOnkeypress };
  },
};
</script>