添加项目文件。

Models/ChatMessage.cs

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+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));
+        }
+    }
+}

Models/ModelDescription.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace YwxApp.AiChat.Models
+{
+    /// <summary>
+    /// select switch  display model description.
+    /// </summary>
+    public class ModelDescription
+    {
+        public const string CodeGemma = "codegemma";
+        public const string Llama32 = "llama3.2";
+        //model list(description)
+        public const string Codellama34b = "codellama:34b";
+        public const string Llava13b = "llava:13b";
+        public const string CommandRLatest = "command-r:latest";
+        public const string Wizardlm2Latest = "wizardlm2:latest";
+        public const string Qwen25CoderLatest = "qwen2.5-coder:latest";
+        public const string Qwen25_14b = "qwen2.5:14b";
+        public const string SamanthaMistralLatest = "samantha-mistral:latest";
+        public const string MistralSmallLatest = "mistral-small:latest";
+        public const string Gemma29b = "gemma2:9b";
+        public const string NemotronMiniLatest = "nemotron-mini:latest";
+        public const string Phi35Latest = "phi3.5:latest";
+        public const string Llama32VisionLatest = "llama3.2-vision:latest";
+        public const string Llama31_8b = "llama3.1:8b";
+        public const string Gemma22b = "gemma2:2b";
+        public const string Qwen27b = "qwen2:7b";
+        public const string Qwen20_5b = "qwen2:0.5b";
+        public const string Llama31_70b = "llama3.1:70b";
+        public const string Llama31Latest = "llama3.1:latest";
+        public const string Llama32Latest = "llama3.2:latest";
+        public const string Llama32_3b = "llama3.2:3b";
+    }
+
+
+}