SignalR ASP.Net核心不提供通过Typescript客户端添加上下文项的方法

using Microsoft.AspNetCore.SignalR;

public static class SignalRExtensions
{
    public static async Task SendContextItems(this Hub hub, IDictionary<string, object> contextItems)
    {
        await hub.Clients.All.SendAsync("ContextItems", contextItems);
    }
}

import * as signalR from "@microsoft/signalr";

const connection = new signalR.HubConnectionBuilder()
    .withUrl("/hub")
    .build();

connection.on("ContextItems", (contextItems) => {
    // 处理接收到的上下文项
    console.log(contextItems);
});

connection.start()
    .then(() => {
        // 连接成功后，发送请求获取上下文项
        connection.invoke("SendContextItems")
            .catch((error) => {
                console.error(error);
            });
    })
    .catch((error) => {
        console.error(error);
    });