前端：

1、优化消息排序逻辑
2、新增加载历史消息
3、修复已知问题
后端：
1、优化消息排序逻辑
2、增加用户信息缓存机制
3、修改日期类型为DateTimeOffset改善时区信息丢失问题
3、修复了已知问题
数据库：
1、新增SequenceId字段用于消息排序
2、新增ClientMsgId字段用于客户端消息回执

backend/IM_API/Services/GroupService.cs

@@ -1,4 +1,5 @@
 using AutoMapper;
+using AutoMapper.QueryableExtensions;
 using IM_API.Domain.Events;
 using IM_API.Dtos.Group;
 using IM_API.Exceptions;
@@ -27,7 +28,7 @@ namespace IM_API.Services
 
         private async Task<List<GroupInvite>> GetGroupInvites(int userId, int groupId, List<int> ids)
         {
-            DateTime dateTime = DateTime.UtcNow;
+            DateTime dateTime = DateTime.Now;
             //验证被邀请用户是否为好友
             var validFriendIds = await _context.Friends
             .Where(f => f.UserId == userId && ids.Contains(f.FriendId))
@@ -44,13 +45,14 @@ namespace IM_API.Services
             }).ToList();
         }
 
-        public async Task<GroupInfoDto> CreateGroup(int userId, GroupCreateDto groupCreateDto, List<int> userIds)
+        public async Task<GroupInfoDto> CreateGroupAsync(int userId, GroupCreateDto groupCreateDto)
         {
+            List<int> userIds = groupCreateDto.UserIDs ?? [];
             using var transaction = await _context.Database.BeginTransactionAsync();
             try
             {
                 //先创建群
-                DateTime dateTime = DateTime.UtcNow;
+                DateTime dateTime = DateTime.Now;
                 Group group = _mapper.Map<Group>(groupCreateDto);
                 group.GroupMaster = userId;
                 _context.Groups.Add(group);
@@ -90,21 +92,38 @@ namespace IM_API.Services
             }
         }
 
-        public Task DeleteGroup(int userId, int groupId)
+        public Task DeleteGroupAsync(int userId, int groupId)
         {
             throw new NotImplementedException();
         }
 
-        public async Task InviteUsers(int userId, int groupId, List<int> userIds)
+        public async Task InviteUsersAsync(int userId, int groupId, List<int> userIds)
         {
             var group = await _context.Groups.FirstOrDefaultAsync(
                 x => x.Id == groupId) ?? throw new BaseException(CodeDefine.GROUP_NOT_FOUND);
             
         }
 
-        public Task JoinGroup(int userId, int groupId)
+        public Task JoinGroupAsync(int userId, int groupId)
         {
             throw new NotImplementedException();
         }
+
+        public async Task<List<GroupInfoDto>> GetGroupListAsync(int userId, int page, int limit, bool desc)
+        {
+            var query = _context.GroupMembers
+                .Where(x => x.UserId == userId)
+                .Select(s => s.Group);
+            if (desc)
+            {
+                query = query.OrderByDescending(x => x.Id);
+            }
+            var list = await query
+                .Skip((page - 1) * limit)
+                .Take(limit)
+                .ProjectTo<GroupInfoDto>(_mapper.ConfigurationProvider)
+                .ToListAsync();
+            return list;
+        }
     }
 }