使用C# 调用deepseek api接口实现正常访问的过程

public class DeepSeekHelper
 {
     private static readonly HttpClient client = new HttpClient();
     private const string ApiEndpoint = "https://api.deepseek.com/v1/chat/completions";
     private static readonly string apiKey = "你的apikey";
     public static async Task<string> CallDeepSeekAPI(string userQuestion)
     {
         ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
         try
         {
             // 设置请求头
             client.DefaultRequestHeaders.Clear();
             client.DefaultRequestHeaders.Add("Authorization", $"Bearer {apiKey}");
             client.DefaultRequestHeaders.Add("Accept", "application/json");
             // 构建请求体
             var requestBody = new
             {
                 model = "deepseek-reasoner", // 根据实际模型调整
                 messages = new[]
                 {
                 new
                 {
                     role = "user",
                     content = userQuestion
                 }
             },
                 temperature = 0.7
             };
             // 序列化请求体
             //var jsonContent = JsonSerializer.Serialize(requestBody);
             var jsonContent = JsonConvert.SerializeObject(requestBody);
             var content = new StringContent(jsonContent, Encoding.UTF8, "application/json");
             // 发送请求
             var response = await client.PostAsync(ApiEndpoint, content);
             // 处理响应
             if (!response.IsSuccessStatusCode)
             {
                 throw new Exception($"API请求失败: {response.StatusCode}");
             }
             var responseContent = await response.Content.ReadAsStringAsync();
             var resultModel = JsonConvert.DeserializeObject<DeepSeekResponse>(responseContent);
             if (resultModel != null && resultModel.Choices.Count > 0)
                 return resultModel.Choices[0].Message.Content;
             return responseContent;
         }
         catch (Exception ex)
         {
             // 处理异常
             return $"调用API时发生错误: {ex.Message}";
         }
     }
 }
 public class DeepSeekResponse
 {
     public string Id { get; set; }
     public string Object { get; set; }
     public long Created { get; set; }
     public string Model { get; set; }
     public List<Choice> Choices { get; set; }
     public Usage Usage { get; set; }
     public string SystemFingerprint { get; set; }
     // 重写ToString方法以便更好地显示对象信息
     public override string ToString()
     {
         return $"DeepSeekResponse(Id={Id}, Object={Object}, Created={Created}, Model={Model}, Choices={string.Join(", ", Choices)}, Usage={Usage}, SystemFingerprint={SystemFingerprint})";
     }
 }
 public class Choice
 {
     public int Index { get; set; }
     public Message Message { get; set; }
     // 其他Choice相关的属性...
     // 重写ToString方法以便更好地显示Choice信息（这里仅展示Index和Message作为示例）
     public override string ToString()
     {
         return $"Choice(Index={Index}, Message={Message})";
     }
 }
 public class Message
 {
     public string Role { get; set; }
     public string Content { get; set; }
     // 其他Message相关的属性...
 }
 public class Usage
 {
     public int PromptTokens { get; set; }
     public int CompletionTokens { get; set; }
     public int TotalTokens { get; set; }
     // 其他Usage相关的属性，包括嵌套的字典等，可以根据需要添加
 }

private async void SendButton_Click(object sender, RoutedEventArgs e)
   {
       string requestText = RequestTextBox.Text;
       if (!string.IsNullOrWhiteSpace(requestText))
       {
           try
           {
               string responseData = await DeepSeekHelper.CallDeepSeekAPI(requestText); // await new DeepSeekApi().CallDeepSeekAPI(chatRequest);
               ResponseTextBox.Text = responseData;
           }
           catch (Exception ex)
           {
               ResponseTextBox.Text = $"Error: {ex.Message}";
           }
       }
       else
       {
           MessageBox.Show("Please enter a request.");
       }
   }

 ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;