Can't pass data to asp.net core - asp.net

Question

I have a problem, I need to send data from my Angular to my ASP.NET Core server. Here is controller:
[HttpPut]
public IActionResult setCoupon(int id, string CouponCode, int DiscountPercent)
{
try
{
var coupon = new Coupon()
{
Id = id,
CouponCode = CouponCode,
DiscountPercent = DiscountPercent
};
return Ok(coupon);
}
catch (Exception)
{
return BadRequest("Wystąpił błąd");
}
}
Here is factory from ngResource (getCoupon is working):
app.factory('couponApi',
function($resource) {
return $resource("/coupon/setCoupon",
{},
{
getCoupon: {
method: "GET",
isArray: false
},
putCoupon: {
method: "PUT",
isArray: false,
}
});
});
Here is usage of factory:
$scope.addCouponCode = function(coupon) {
couponApi.putCoupon(coupon);
};
When i debug my asp.net server i found my params null or 0. I have the same problem on restangular library.
I also try this way to write controller method
[HttpPut]
public IActionResult setCoupon(Coupon coupon)
{
try
{
return Ok(coupon);
}
catch (Exception)
{
return BadRequest("Wystąpił błąd");
}
}
My json which I try to send is this
{"id":1,"couponCode":"abc","discountPercent":10}
and my Echo method send me this:
{"id":0,"couponCode":null,"discountPercent":0}
Update
Apparently in asp.net core, method need to have attribute[FromBody]
[HttpPut]
public IActionResult setCoupon([FromBody] Coupon coupon)
{
try
{
return Ok(coupon);
}
catch (Exception)
{
return BadRequest(new {errorMessage = "Wystąpił błąd"});
}
}

Answer 1

As Aldo says in the comments. The answer is C# expects case-sensitive matching of the json data. So:
{"id":1,"couponCode":"abc","discountPercent":10}
needs to be:
{"id":1,"CouponCode":"abc","DiscountPercent":10}
You were getting a 0 for 'discountPercent' because that is the default value of the unmatched int, whereas null is the default for a unmatched string, hence Echo returns:
{"id":0,"couponCode":null,"discountPercent":0}