How to receive JSON data on WebAPI backend C#?

Question

How do I receive JSON data on my WebAPI backend in C#?

I have the following JSON sent from my JavaScript frontend.

{
    \"User_Id\": 1,
    \"T         


        

Answer 1

The Content-Type of your request should be "application/json"

If you post your json in a body of the request than change a method signature to

[HttpPost]
public bool AddOrder([FromBody] PurchaseOrder order)
{
}

Answer 2

Try using Newtonsoft.Json package from NuGet. They have functions to serialize and deserialize any string to Json. Also try using dynamic type variables. Helps for deserializing.

Answer 3

Problem solved, it was the "application/json" that was missing. For other persons having the same problem, here is my function. I´m using Knockout.js, hence the "self"-word.

self.makePurchase = function () {
            var tempUserId = self.orderUserId();
            var tempCartPrice = self.ShoppingCartPrice();
            var tempAddress = self.orderAddress();
            var tempCart = self.ShoppingCart();

            var orderSave = new PurchaseSave(tempUserId, tempCartPrice, tempAddress, tempCart);
            var myData = ko.toJSON(orderSave);
            console.log(myData);

            $.ajax({
                type: "POST",
                async: false,
                url: '/Products/AddOrder',
                contentType: "application/json", // Thank you Stackoverflow!!!
                dataType: "json",
                traditional: true,
                data: myData,
                error: function (xhr, textStatus, errorThrown) {
                    console.log(xhr.responseText);
                    console.log("Inside the error method");

                },
                success: function (data) {
                    console.log("Inside the success method");

                }
            });
        }

Answer 4

Change your implementation to this.

[System.Web.Http.HttpPost]
public bool AddOrder([FromBody] PurchaseOrder order)
{

}

For more details - http://www.asp.net/web-api/overview/getting-started-with-aspnet-web-api/tutorial-your-first-web-api