前端：

1、完善创建群聊逻辑
后端：
1、完善群聊相关接口

backend/IM_API/Application/EventHandlers/GroupInviteHandler/GroupInviteSignalRHandler.cs

@@ -0,0 +1,26 @@
+using IM_API.Domain.Events;
+using IM_API.Dtos;
+using IM_API.Hubs;
+using IM_API.VOs.Group;
+using MassTransit;
+using Microsoft.AspNetCore.SignalR;
+
+namespace IM_API.Application.EventHandlers.GroupInviteHandler
+{
+    public class GroupInviteSignalRHandler : IConsumer<GroupInviteEvent>
+    {
+        private readonly IHubContext<ChatHub> _hub;
+        public GroupInviteSignalRHandler(IHubContext<ChatHub> hub)
+        {
+            _hub = hub;
+        }
+
+        public async Task Consume(ConsumeContext<GroupInviteEvent> context)
+        {
+            var @event = context.Message;
+            var list  = @event.Ids.Select(id => id.ToString()).ToArray();
+            var msg = new HubResponse<GroupInviteVo>("Event", new GroupInviteVo { GroupId = @event.GroupId, UserId = @event.UserId });
+            await _hub.Clients.Users(list).SendAsync("ReceiveMessage", msg);
+        }
+    }
+}