添加项目文件。

Services/OpenAIService.cs

@@ -0,0 +1,54 @@
+using System.Net.Http;
+using System.Net.Http.Headers;
+using System.Net.Http.Json;
+
+namespace YwxApp.AiChat.Services
+{
+    public class OpenAIService : IChatService
+    {
+        private readonly HttpClient _httpClient;
+        private string _modelName = "gpt-3.5-turbo";
+
+        public OpenAIService()
+        {
+            _httpClient = new HttpClient();
+            _httpClient.BaseAddress = new Uri("https://api.openai.com/v1/");
+        }
+
+        public void Configure(string apiKey, string modelName = "gpt-3.5-turbo")
+        {
+            _httpClient.DefaultRequestHeaders.Authorization =
+                new AuthenticationHeaderValue("Bearer", apiKey);
+            _modelName = modelName;
+        }
+
+        public async Task<string> GetResponseAsync(string prompt)
+        {
+            var requestBody = new
+            {
+                model = _modelName,
+                messages = new[] { new { role = "user", content = prompt } }
+            };
+
+            var response = await _httpClient.PostAsJsonAsync("chat/completions", requestBody);
+            var responseContent = await response.Content.ReadFromJsonAsync<OpenAIResponse>();
+
+            return responseContent?.Choices[0].Message.Content ?? "No response";
+        }
+
+        public class Message
+        {
+            public string Content { get; set; }
+        }
+        public class Choice
+        {
+              public Message Message { get; set; }
+
+        }
+        private class OpenAIResponse
+        {
+            public Choice[] Choices { get; set; }
+            
+        }
+    }
+}