Sending a string of JSON as a POST to asp.net web api

Question

I am attempting to send a string to my web api like this:

public IList<Product> GetProducts(string myString)
{
    IList<Product> retVal = null;
    using (var client = GetClient())
    {
        HttpContent httpContent = new StringContent(myString, Encoding.UTF8, "application/json");

        // HTTP POST
        HttpResponseMessage response = client.PostAsync("api/products", httpContent).Result;
    }
    return retVal;
}

In my ProductsController my action method looks like this:

// POST: api/products/filter
[HttpPost("filter")]
public IList<Product> Filter(string filter)
{

}

For some reason the filter param keeps coming in as null. Any ideas why?

score 2 · Accepted Answer · answered Jul 18 '16 at 20:58

2

You should decorate parameter with [FromBody] attribute as post will not take value from url I suspect

answered Jul 18 '16 at 20:58

VidasV

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Hmm I tried it with FromBody and still null. Should content-type be application/json if sending a string of json? – Blake Rivell Jul 18 '16 at 21:01

score 0 · Answer 2 · answered Jul 18 '16 at 21:17

0

Looks like youre posting to api/products, not api/products/filter. Signature for the method should be as Vidas says with the from body attribute, but posted to the correct url.

[HttpPost]
[Route("api/products/filter")
Public ilist<product>  Filter([FromBody] string filter)
{...}

While the route isnt specifically necessary, it can help you specify the url you are working with!

answered Jul 18 '16 at 21:17

Chris Watts

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Sorry I apolgize. At the top of the products controller I have api/controllerName specified. – Blake Rivell Jul 19 '16 at 13:21
My observation was based on your getproducts method, but looks like you got it sorted in the end which is the main thing – Chris Watts Jul 19 '16 at 14:42

Sending a string of JSON as a POST to asp.net web api

2 Answers2