无法将 Json 数组发布到 Web 核心 API

Question

使用此代码，我试图将 Json 数组发布到我的 Web 核心 API 中的方法。但是数组以空值形式到达。

importProperties = function (url, callback, data) {
        var properties = JSON.stringify(data);
        $.ajax({
            url: url,
            type: "POST",
            contentType: "application/json",
            dataType: "json",
            data: { "": properties }
        })
            .done(callback)
            .fail(errorMessage);
    }

一旦数据被 JSON.stringified，它看起来像；

[{"UPRN":"12345","StreetName":"COMPORT GREEN","AddressLine2":"NEW ADDINGTON","AddressLine3":"Croydon","AddressLine4":"Surrey","Postcode":"CR0 0BY","Latitude":null,"Longitude":null,"BlockUPRN":"B12345","PropertyNo":"1","BlockName":"Block Court","Comments":null,"PropertyTypeId":6,"NumberOfBathrooms":1,"NumberOfBedrooms":2,"NumberOfKitchens":1,"PropertyContractId":0,"PropertyType":null},
{"UPRN":"67890","StreetName":"COMPORT GREEN","AddressLine2":"NEW ADDINGTON","AddressLine3":"Croydon","AddressLine4":"Surrey","Postcode":"CR0 0BY","Latitude":null,"Longitude":null,"BlockUPRN":"B67890","PropertyNo":"2","BlockName":"Block Court","Comments":null,"PropertyTypeId":6,"NumberOfBathrooms":null,"NumberOfBedrooms":null,"NumberOfKitchens":null,"PropertyContractId":0,"PropertyType":null}]

我的网络核心 API 上的方法签名是；

[HttpPost("{contractId}/import")]
public async Task<IActionResult> Import(int contractId, [FromBody] IEnumerable<PropertyAndContractDto> properties)
{
   this.NLogger.Info($"api/property/contractId = {contractId}/saveproperties".ToPrefix());
   if (properties == null)
   {
      return BadRequest();
   }
...
}

DTO 是

    public class PropertyAndContractDto
    {
        public string UPRN { get; set; }
        public string StreetName { get; set; }
        public string AddressLine2 { get; set; }
        public string AddressLine3 { get; set; }
        public string AddressLine4 { get; set; }
        public string Postcode { get; set; }
        public string Latitude { get; set; }
        public string Longitude { get; set; }
        public string BlockUPRN { get; set; }
        public string PropertyNo { get; set; }
        public string BlockName { get; set; }
        public string Comments { get; set; }
        public int? PropertyTypeId { get; set; }
        public int? NumberOfBathrooms { get; set; }
        public int? NumberOfBedrooms { get; set; }
        public int? NumberOfKitchens { get; set; }
        public int PropertyContractId { get; set; }
        public string PropertyType { get; set; }
    }
}

当我在 Postman 中运行时，它可以工作；

那么为什么properties参数是null呢？

Answer 1

尝试将 ajax 调用的 processData 属性设置为 false，如下所示：

$.ajax({
            url: url,
            type: "POST",
            contentType: "application/json",
            dataType: "json",
            data: { "": properties },
            processData: false
        })

根据docs：

默认情况下，数据作为对象传入 data 选项 （从技术上讲，除字符串之外的任何内容）都将被处理并 转换为查询字符串，适合默认的内容类型 “应用程序/x-www-form-urlencoded”。如果你想发送一个 DOMDocument 或其他未处理的数据，将此选项设置为 false。

或者，只需将 data 属性设置为您的字符串化 json：

$.ajax({
            url: url,
            type: "POST",
            contentType: "application/json",
            dataType: "json",
            data: properties
        })