C#实现一个HttpClient集成通义千问-流式输出内容提取

返回对象处理

返回对象分析

根据流式返回的数据处理

内容对象

{
  "choices": [
    {
      "delta": { "content": "", "role": "assistant" },
      "index": 0,
      "logprobs": null,
      "finish_reason": null,
    },
  ],
  "object": "chat.completion.chunk",
  "usage": null,
  "created": 1733319748,
  "system_fingerprint": null,
  "model": "qwen2-vl-7b-instruct",
  "id": "chatcmpl-34615907-7d35-9f8a-993b-af7c94ea8717",
}

最后一条显示token的内容

{
  "choices": [],
  "object": "chat.completion.chunk",
  "usage": { "prompt_tokens": 29, "completion_tokens": 100, "total_tokens": 129 },
  "created": 1733319748,
  "system_fingerprint": null,
  "model": "qwen2-vl-7b-instruct",
  "id": "chatcmpl-34615907-7d35-9f8a-993b-af7c94ea8717",
}

将上面两个json内容合并生成一个对象类，主要就是choices字段和usage字段合并两个类就行了

具体操作就是复制json内容，切换到一个空的类文件中，然后在“编辑”→“选择性粘贴”→“将JSON 粘贴为类”操作，自动生产类，

将上面两个json都生成一遍，合并主类为StreamObject,得到json类如下

    public class StreamObject
    {
        public Choice[] choices { get; set; }
        public string _object { get; set; }
        public Usage usage { get; set; }
        public int created { get; set; }
        public object system_fingerprint { get; set; }
        public string model { get; set; }
        public string id { get; set; }
    }

    public class Choice
    {
        public Delta delta { get; set; }
        public object finish_reason { get; set; }
        public int index { get; set; }
        public object logprobs { get; set; }
    }

    public class Delta
    {
        public string content { get; set; }
    }

    public class Usage
    {
        public int prompt_tokens { get; set; }
        public int completion_tokens { get; set; }
        public int total_tokens { get; set; }
    }

流式对象反序列化

对返回的数据进行反序列化，然后判断choices数量，获取里面的content内容

额外的：可以sleep一下，可以看到像对话一样流式输出的效果了

 var streamObject = JsonSerializer.Deserialize<StreamObject>(data);
 if (streamObject.choices.Count() > 0)
 {
     var contentRes = streamObject.choices[0].delta.content;
     Console.Write(contentRes);
 }

效果：

显示提取出的内容

视频教程