为什么我从 Ajax 调用传递 JSON 对象作为 ASP.NET Core 中的数据在控制器中获取空对象？

Question

下面的代码是查看页面并调用Ajax方法。我需要传递地址对象。

var address = {};

address.userId = parseInt($("#userID").val());
address.addressLine1 = $("#addAddressLine1").val();
address.addressLine2 = $("#addAddressLine2").val();
address.cityId = parseInt($("#addAddressCity").val());
address.zipCode = $("#addAddressPostCode").val();
address.mobileNo = $("#addAddressPhoneNumber").val();

$.ajax({
            type: "POST",
            url: "@Url.Action("AddAddress")",
            data:JSON.stringify(address),
            dataType: 'json',
            contentType: 'application/json',
            success: function (responce) {
                if (responce) {
                    alert("true");
                }
                else {
                    alert("fail");
                }
            },
            failure: function (response) {
                alert("failure");
            },
            error: function (response) {
                alert("Something went Wrong");
            }
});

这是我的控制器操作方法的代码。当从 Ajax:

调用时，我得到地址对象的 Null 值

public IActionResult AddAddress([FromBody] AddressViewModel address)
{
    return Json(address != null);
}

这是我的视图模型：

public class AddressViewModel
{
    [JsonPropertyName("userId")]
    public int UserId { get; set; }
    [JsonPropertyName("addressLine1")]
    public string AddressLine1 { get; set; }
    [JsonPropertyName("addressLine2")]
    public string AddressLine2 { get; set; }
    [JsonPropertyName("zipCode")]
    public string ZipCode { get; set; }
    [JsonPropertyName("mobileNo")]
    public string MobileNo { get; set; }
    [JsonPropertyName("cityId")]
    public int CityId { get; set; }
}

我需要在哪里更改我的代码？我需要更改 StartUp.cs 中的某些内容吗？

Answer 1

需要确保address.userId = parseInt($("#userID").val());和address.cityId = parseInt($("#addAddressCity").val());.int类型的值不能接受空值，如果address.userId或address.cityId为空，AddressViewModel address 将是 null.You 可以尝试使用 #nullable enable 或更改 address.userId 或 address.cityId 的值。

#nullable enable
public class AddressViewModel
{
    [JsonPropertyName("userId")]
    public int? UserId { get; set; }
    [JsonPropertyName("addressLine1")]
    public string AddressLine1 { get; set; }
    [JsonPropertyName("addressLine2")]
    public string AddressLine2 { get; set; }
    [JsonPropertyName("zipCode")]
    public string ZipCode { get; set; }
    [JsonPropertyName("mobileNo")]
    public string MobileNo { get; set; }
    [JsonPropertyName("cityId")]
    public int? CityId { get; set; }
}

为什么我从 Ajax 调用传递 JSON 对象作为 ASP.NET Core 中的数据在控制器中获取空对象？

Why I getting null Object in controller from Ajax call passing JSON object as data in ASP.NET Core?

ajax

jquery

asp.net-core-mvc

.net-core

asp.net-core