将值发布到webapi控制器

Question

Here is my WebAPi controller and html form. The request is correctly routed to the method in the controller by myValue is always null. I thouht this was a valid way to post getting it from some tutorials.

Controller:

[Route("add")]
public string Post([FromBody]string  myValue)
{
    return string.Format("HAIAA: [{0}]" , myValue);
}

View:

<form id="formOne" method="post" action="ninja/add">
    <input type="text" name="myValue" /> 
    <input type="submit" value="submit" />
</form>

Answer 1

You cannot POST a simple type parameter using an HTML form to a Web API action. Either use a complex type containing your parameter:

public class MyFormData {
    public string myValue { get; set; }
}

Changing your controller signature:

[Route("add")]
public string Post([FromBody]MyFormData data)
{
    return string.Format("HAIAA: [{0}]" , data.myValue);
}

Or use AJAX for POSTing the single value to your action:

$('#formOne').submit(function () {
    $.post('ninja/add', { "": $('input[name=myValue]').val() })
        .success(function () {
            //do something
        })
        .error(function () {
            //show error
        });
    return false;
});

Answer 2

There are caveats to using post parameters.

Here is the best resource I have found:

http://encosia.com/using-jquery-to-post-frombody-parameters-to-web-api/

Most likely:

// POST api/values
public string Post([FromBody]string value) {
  return value;
}

and this weirdness:

the value you need to send over needs to be

{ '': value }

this is the jquery

$.post('ninja/add', { '': value });

Not exactly sure how to fix it in your example........but I think I am giving you the correct value to try to send.

Answer 3

I had the same problem once, and it worked for me to use System.Net.Http.Formatting.FormDataCollection , which takes an object representing the data sent as application-x-www-form-urlencoded

Try

public string Post(System.Net.Http>formatting.FormDataCollection data)
{
    return string.Format("HAIAA: [{0}]" , data.Get("myValue"));
}

Answer 4

You can try this way.

[Route("add")]
        public string Post(System.Net.Http.Formatting.FormDataCollection myValue)
        {
            NameValueCollection nvc = form.ReadAsNameValueCollection();
            string value = nvc.Get("myValue");
            return string.Format("HAIAA: [{0}]", value);
        }