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Common/Dtos/Conversation/ChatItemDto.cs

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+using Common.Enums;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Common.Dtos.Conversation
+{
+    public class ChatItemDto
+    {
+        public int ID { get; set; }
+        public string LastText { get; set; }
+        public ConversationType LastMsgType { get; set; }
+        public ConversationStatus status { get; set; }
+
+        public int? GroupID { get; set; }
+        public string? GroupName { get; set; }
+
+        public int UserID { get; set; }
+        public string? UserFullName { get; set; }
+
+        public int? ExperID { get; set; }
+        public string? ExperFullName { get; set; }
+
+        public string LastMsgdate { get; set; }
+        public string LastMsgtime { get; set; }
+
+        public List<ChatItemResponseDto> Responses { get; set; }
+    }
+}

Common/Dtos/Conversation/ChatItemResponseDto.cs

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+using Common.Enums;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Common.Dtos.Conversation
+{
+   public class ChatItemResponseDto
+    {
+        public int ID { get; set; }
+        public int ChatItemID { get; set; }
+        public int? ExperID { get; set; }
+        public bool IsRead { get; set; } = false;
+        public string ExperName { get; set; }
+        public ConversationType Type { get; set; }
+        public string text { get; set; }
+        public string FileName { get; set; }
+        public string FileType { get; set; }
+        public byte[] FileContent { get; set; }
+    }
+}

Common/Dtos/CurrentUserInfo.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Common.Dtos
+{
+   public class CurrentUserInfo
+    {
+        public int CompanyID { get; set; }= 0;
+        public int? ExperID { get; set; }
+        public string Username { get; set; } = "";
+        public string Role  { get; set; }= "";
+    }
+}