mapo-core/MP.SPEC/Pages/TestBtn.razor.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Components;
using System.Net.Http;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Components.Authorization;
using Microsoft.AspNetCore.Components.Forms;
using Microsoft.AspNetCore.Components.Routing;
using Microsoft.AspNetCore.Components.Web;
using Microsoft.AspNetCore.Components.Web.Virtualization;
using Microsoft.JSInterop;
using MP.SPEC;
using MP.SPEC.Shared;
using MP.SPEC.Components;
using MP.SPEC.Data;
using System.Text;

namespace MP.SPEC.Pages
{
    public partial class TestBtn
    {
        [Inject]
        protected MsgServiceSpec MService { get; set; } = null!;

        public EventCallback<string> newBcMsg { get; set; }

        protected override async Task OnInitializedAsync()
        {
            await Task.Delay(1);
            MService.EA_BroadCastMsg += OnNewBCMsg;
        }

        public async void OnNewBCMsg()
        {
            await InvokeAsync(() =>
            {
                StateHasChanged();
            });
        }
        StringBuilder sb = new StringBuilder();
        protected async Task addOne()
        {
            await Task.Delay(1);
            sb.Append("1");
            countMsg = sb.ToString();
        }

        public string countMsg
        {
            get
            {
                return MService.newBCMsg;
            }
            set
            {
                MService.newBCMsg = value;
                reportChange();
            }
        }

        private void reportChange()
        {
            newBcMsg.InvokeAsync(countMsg);
        }
    }
}