HttpWebRequest实现通用的Post提交，传递header,token等

封装的代码如下：

/// <summary>
/// HttpWebRequest实现的通用的Post提交，传递header,token等
/// </summary>
/// <param name="Url"></param>
/// <param name="Pram"></param>
/// <param name="json"></param>
/// <returns></returns>
public static string HttpPost(string Url, Dictionary<string, string> Pram, string json, string token)
{
    string PageStr = string.Empty;
    Url += "?";
    foreach (var item in Pram)
    {
        Url += item.Key + "=" + item.Value + "&";
    }
    Uri url = new Uri(Url.TrimEnd('&'));
    byte[] reqbytes = Encoding.UTF8.GetBytes(json);
    HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
    req.Headers.Add("Authorization", $"Bearer {token}");
    req.Method = "post";
    // req.ContentType = "application/x-www-form-urlencoded";
    req.ContentType = "application/json";
    req.ContentLength = reqbytes.Length;
    Stream stm = req.GetRequestStream();
    stm.Write(reqbytes, 0, reqbytes.Length);
    stm.Close();
    HttpWebResponse wr = (HttpWebResponse)req.GetResponse();
    Stream stream = wr.GetResponseStream();
    StreamReader srd = new StreamReader(stream, Encoding.UTF8);
    PageStr += srd.ReadToEnd();
    srd.Close();
    return PageStr;
}

调用示例

public static void ChatQ(string question)
{
    var dic = new Dictionary<string, Object>();
    dic.Add("prompt", question);
    dic.Add("model", "text-davinci-003");
    dic.Add("max_tokens", 2000);
    dic.Add("temperature", 0.5);
    var s = HttpPost("https://api.openai.com/v1/completions", new Dictionary<string, string>(), JsonConvert.SerializeObject(dic), "你的token");
    //Console.WriteLine(s);
    var result = Newtonsoft.Json.JsonConvert.DeserializeObject<OpenAI_Response>(s);
    Console.WriteLine("回答: " + result.choices[0].text);
}