在C＃中，提交表单字符串输入为null

Question

In my javascript I have:

 function reset() { document.getElementById("login").submit(); } 

The request then looks like:

I'm submitting that to .NET api:

 public async Task<HttpResponseMessage> Reset([FromBody]string login) {} 

and the login string is null. Is the request I am making wrong? Or am I accepting it wrong? I'd like to just send abcdefr instead of login=abcdefr

my html:

 <div id="reset_password_panel"> <form name="reset-pasword" id="reset-pasword" action="/Reset" method="POST"> <label for="user">User</label> <div><input style="width: 100%" type="text" placeholder="User" id="login" name="login" required /> </div> <div style="width: 100%; display: inline-block;margin-top: 10px;"> <div style="float: left; margin-right: 20px"><button id="btn_login" class="button" onclick="resetPassword()" type="submit">Reset</button> </div> </div> </form> </div> 

If I create class:

 public class LoginModel { public string Login {get;set;} } 

and pass it to

 public async Task<HttpResponseMessage> Reset([FromBody]LoginModel login) {} 

it works, but is it possible to pass just a string

Answer 1

The request body is actually login=abcdefr , according to the screenshot, therefore you should declare a class to accept it. If you want to only send a string, consider sending "abcdefr" :

$.ajax({
    'type': 'POST',
    'url': '/Reset',
    'contentType': 'application/json',
    'data': JSON.stringify(document.getElementById("login").value),
    'dataType': 'json'
});

Then you can accept it with a string.

Answer 2

it works, but is it possible to pass just a string

You can pass raw string data to your route, provided the content type is application/json or application/x-www-form-urlencoded , and the parameter type is string ; anything else and it won't match your route.

If your parameter is a model, the model binder will try to map the input (whether JSON or form data) to your model. If it's a string, it will pass you the raw data.

The problem is, that if you are passing in raw form data, you'll just have to parse out the bits you want (in your case the "login" value) anyway, so you may as well just use a model instead, and let the model binder do it for you.