[HttpPost]
public async Task<IActionResult> testpost([FromForm] object info)

{
    //Postman工具测试结果：
    //FromBody,Postman的body只有=raw+json时才进的来
    //参数为空时，Body(form-data、x-www-form-urlencoded)解析到的数据也有所不同

    Dictionary<string,object> parmsVals=new Dictionary<string,object>();
    try
    {
        if (HttpContext.Request.Body != null)
        {
            Stream _stream = HttpContext.Request.Body;
            //_stream.Position = 0;
            using (StreamReader reader = new StreamReader(_stream, Encoding.UTF8))
            {
                string strv = await reader.ReadToEndAsync();
                if (!string.IsNullOrEmpty(strv) && strv.Trim().StartsWith("{") && strv.Trim().EndsWith("}"))
                {
                    parmsVals = JsonConvert.DeserializeObject<Dictionary<string, object>>(strv.Trim());
                }
                else
                {
                    parmsVals.Add("stream_str", strv);
                }
            }
        }
    }
    catch { }
 

    if (info != null && JsonConvert.SerializeObject(info).Trim()!="{}")
    {
        parmsVals.Add("info", JsonConvert.SerializeObject(info));
    }
    try
    {
        var files = Request.Form.Files;
        if (files != null && files.Count > 0)
        {

        }
    }
    catch { }
   
    
    if (HttpContext.Request.Query.Keys.ToList() != null)
    {
        List<string> lst = HttpContext.Request.Query.Keys.ToList();
        foreach (string key in lst)
        {
            if (!parmsVals.ContainsKey(key))
            {
                parmsVals.Add(key, Request.Query[key].ToString().Trim());
            }
           

        }
    }
    try
    {
      
        
        if (HttpContext.Request.Form != null)
        {
            List<string> lst = HttpContext.Request.Form.Keys.ToList();
            foreach (string key in lst)
            {
                if (!parmsVals.ContainsKey(key))
                {
                    parmsVals.Add(key, Request.Form[key].ToString().Trim());
                }
            }
        }
    }
    catch(Exception ex)
    {
        string msg = ex.Message;
    }
    

    //Values/testurl
    return Content(JsonConvert.SerializeObject(parmsVals));
}

一、Body以 from-data 传参数

二、Body以 x-www-from-urledcoded  传参数

三、Body以 raw+JSON 传参数