添加项目文件。

Models/ChatMessage.cs

@@ -0,0 +1,30 @@
+using System.ComponentModel;
+using System.Runtime.CompilerServices;
+
+namespace YwxApp.AiChat.Models
+{
+    public class ChatMessage : INotifyPropertyChanged
+    {
+        public enum MessageRole { User, Assistant }
+
+        private MessageRole _role;
+        public MessageRole Role
+        {
+            get => _role;
+            set { _role = value; OnPropertyChanged(); }
+        }
+
+        private string _content;
+        public string Content
+        {
+            get => _content;
+            set { _content = value; OnPropertyChanged(); }
+        }
+
+        public event PropertyChangedEventHandler? PropertyChanged;
+        protected virtual void OnPropertyChanged([CallerMemberName] string? name = null)
+        {
+            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(name));
+        }
+    }
+}