WebApi GET and multiple POST parameter without model always null

Question

I am trying send both parameter get and post to method on service without model but it's always null. How can i solve this problem? Also what is logical reason of this problem? Codes as follow which i encountered problem;

[HttpGet]
public Result GetUser(string userId)
{
    using (DataContext dc = new DataContext())
    {
        return dc.GetUser(userId);
    }
}

[HttpPost]
public Result CreateUser([FromBody]string firstname, [FromBody]string lastname)
{
    using (DataContext dc = new DataContext())
    {
        return dc.CreateUser(firstname, lastname);
    }
}

Answer 1

What you are trying to do in the Post request is not valid as per the HTTP protocol. Each web request can only have 1 body, and while it is possible to pass a single param in a unstructured form it is not possible with two (source Asp.net website here ). Hence you have 2 options:

1). Add the 2 params to the url - Change the [FromBody] to [FromUri]

2). Encapsulate both params into a class/model, and accept this as input to your post method (from body or URL/URi will both work). The sender of the data will be able to specify how they wish to send this, via xml or json, by default with asp.net Web api