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

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