使用 HTTPClient PostAsync 发送数组

Question

我有一组需要批量发送的位置点（纬度、经度和 created_at）。但是，当我使用JsonConvert.SerializeObject()它时会返回一个无法在服务器端点上解析的字符串。

var location_content = new FormUrlEncodedContent(new[] {
    new KeyValuePair<string, string>("access_token", $"{Settings.AuthToken}"),
    new KeyValuePair<string, string>("coordinates", JsonConvert.SerializeObject(locations))
});

var response = await client.PostAsync(users_url + bulk_locations_url, location_content);

结果如下所示：

{"access_token":"XX","coordinates":"[{\"created_at\":\"2018-03-27T21:36:15.308265\",\"latitude\":XX,\"longitude\":XX},{\"created_at\":\"2018-03-27T22:16:15.894579\",\"latitude\":XX,\"longitude\":XX}]"}

坐标数组作为一个大字符串出现，因此看起来:"[{\"created_at\":应该是:[{"created_at":.

所以，服务器期待这样的事情：

{"access_token":"XX","coordinates":[{\"created_at\":\"2018-03-27T21:36:15.308265\",\"latitude\":XX,\"longitude\":XX},{\"created_at\":\"2018-03-27T22:16:15.894579\",\"latitude\":XX,\"longitude\":XX}]}

位置文件

public class Location
{
    public DateTime created_at { get; set; }
    public double latitude { get; set; }
    public double longitude { get; set; }

    [PrimaryKey, AutoIncrement, JsonIgnore]
    public int id { get; set; }

    [JsonIgnore]
    public bool uploaded { get; set; }

    public Location()
    {

    }

    public Location(double lat, double lng)
    {
        latitude = lat;
        longitude = lng;

        uploaded = false;
        created_at = DateTime.UtcNow;

        Settings.Latitude = latitude;
        Settings.Longitude = longitude;
    }

    public Location(Position position) : this(position.Latitude, position.Longitude) {}
}

有没有办法使键值对 a <string, []>？我还没有找到一个不使用这<string, string>对的例子。

HttpClient 是否有另一种解决 json 数据数组的方法？

Answer 1

构建模型，然后在发布之前序列化整个事物

var model = new{
    access_token = Settings.AuthToken,
    coordinates = locations
};
var json = JsonConvert.SerializeObject(model);
var location_content = new StringContent(json, Encoding.UTF8, "application/json");

var response = await client.PostAsync(users_url + bulk_locations_url, location_content);