httpContext.Request.GetRawBodyStringAsync（）与[FromBody]字符串正文相同吗？

Question

I am trying to get my head around things (sorry for stupid questions). I get a message request from an Apple device client to my wep api and I am wondering how to handle it. In .NET Framework, I used to handle the message using:

 public async Task<HttpResponseMessage> Server(HttpRequestMessage request)
        {
            var message =  await request.Content.ReadAsStringAsync();

This worked fine but moving to .NET Core, request is always empty. Hence I've moved on to doing this (this works below):

[HttpPut]
[Route("server")]
public async Task<IActionResult> DoSomething()
{
    var requestBody = await HttpContext.Request.GetRawBodyStringAsync();
}

But I am wondering if the above is the correct way of handling such requests and I have also see the use of [FromBody] and wondering it's better to use that but it does not work for me.

[HttpPut]
[Route("server")]
public async Task<IActionResult> DoSomething([FromBody] string requestBody)
{
   //doesn't get called?
}

Answer 1

The parameter name in your action needs to match the property name being sent in the request.

eg if the request is sending: varA=string1&varB=string2&varc=string3

Then your action method should look like this:

[HttpPut]
[Route("server")]
public async Task<IActionResult> DoSomething([FromBody] string varA,[FromBody] string varB,[FromBody] string varC)
{

}

Alternatively, you can have a model class for these type of requests:

class RequestModel{
public string VarA {get;set;}
public string VarB {get;set;}
public string VarC {get;set;}
}

    [HttpPut]
    [Route("server")]
    public async Task<IActionResult> DoSomething([FromBody] RequestModel request)
    {

    }