无法将数据传递到asp.net核心 [英] Can't pass data to asp.net core

问题描述

我遇到问题，我需要将数据从Angular发送到ASP.NET Core服务器.这是控制器:

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");
    }
}

这是ngResource的工厂(getCoupon正在工作):

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,
                }
            });
    });

这是工厂的用法:

        $scope.addCouponCode = function(coupon) {
        couponApi.putCoupon(coupon);
    };

当我调试asp.net服务器时，我发现参数为null或0.我在restangular库上也遇到了同样的问题.

When i debug my asp.net server i found my params null or 0. I have the same problem on restangular library.

我也尝试这种方式来编写控制器方法

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");
        }
    }

我尝试发送的json是这个

My json which I try to send is this

{"id":1,"couponCode":"abc","discountPercent":10}

和我的Echo方法向我发送此信息:

and my Echo method send me this:

{"id":0,"couponCode":null,"discountPercent":0}

更新

显然在asp.net核心中，方法需要具有属性[FromBody]

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"});
        }
    }

推荐答案

正如奥尔多(Aldo)在评论中所说.答案是C#期望json数据区分大小写.所以:

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}

需要是:

{"id":1,"CouponCode":"abc","DiscountPercent":10}

您为'discountPercent'获得了0，因为这是不匹配的int的默认值，而null是不匹配的字符串的默认值，因此Echo返回:

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}

这篇关于无法将数据传递到asp.net核心的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！