C# · 12月 29, 2021

c# – 删除发送到Json MVC的对象的空属性

namespace Booking.Areas.Golfy.Models{ public class Time { public string time { get; set; } public int holes { get; set; } public int slots_available { get; set; } public decimal? price { get; set; } public int? Nextcourseid { get; set; } public bool ShouldSerializeNextcourseid { get { return this.Nextcourseid != null; } } public bool? allow_extra { get; set; } public bool ShouldSerializeallow_extra { get { return this.allow_extra != null; } } }} namespace Booking.Areas.Golfy.Controllers{ public class TeetimesController : Controller { // // GET: /Golfy/Teetimes/ public ActionResult Index( string date,int? courseid = null,int? clubid = null,int? holes = null,int? available = null,int? prices = null ) { var DateFrom = DateTime.ParseExact(date,”yyyy-MM-dd”,CultureInfo.InvariantCulture); Teetimes r = BookingManager.GetBookings(new Code.Classes.Params.ParamGetBooking() { ClubID = clubid,DateFrom = DateFrom,DateTo = DateFrom.AddDays(1),GroundID = courseid }); return Json(r,JsonRequestBehavior.AllowGet); } }}

上面的webservice返回一个json字符串与几个意思的时间.

我希望属性Nextcourseid和allow_extra在其值为null时被遗漏在输出之外.

我尝试了ShouldSerializeXxx但似乎没有工作.
FYI:我也尝试[ScriptIgnore]哪个工作,但不是有条件的.

解决方法 您不能使用默认Json ActionResult来删除空属性.

您可以看一下JSON.NET,它有一个属性,您可以设置为删除属性(如果为空)

[JsonProperty(NullValueHandling=NullValueHandling.Ignore)]

或者如果您不想使用其他库,您可以创建自己的json自定义ActionResult并为默认的JavaScriptSerializer注册一个新的转换器,如下所示:

public class JsonWithoutNullPropertiesResult : ActionResult{ private object Data { get; set; } public JsonWithoutNullPropertiesResult(object data) { Data = data; } public override void ExecuteResult(ControllerContext context) { HttpResponseBase response = context.HttpContext.Response; response.ContentType = “application/x-javascript”; response.ContentEncoding = Encoding.UTF8; if (Data != null) { JavaScriptSerializer serializer = new JavaScriptSerializer(); serializer.RegisterConverters(new[] { new NullPropertiesConverter() }); string ser = serializer.Serialize(Data); response.Write(ser); } }}public class NullPropertiesConverter : JavaScriptConverter{ public override IDictionary<string,object> Serialize(object obj,JavaScriptSerializer serializer) { var toSerialize = new Dictionary<string,object>(); foreach (var prop in obj.GetType() .GetProperties(BindingFlags.Instance | BindingFlags.Public) .Select(p => new { Name = p.Name,Value = p.GetValue(obj) }) .Where(p => p.Value != null)) { toSerialize.Add(prop.Name,prop.Value); } return toSerialize; } public override object Deserialize(IDictionary<string,object> dictionary,Type type,JavaScriptSerializer serializer) { throw new NotImplementedException(); } public override IEnumerable<Type> SupportedTypes { get { return GetType().Assembly.GetTypes(); } }}

现在在你看来:

public ActionResult Index(){ Teetimes r = BookingManager.GetBookings(); return new JsonWithoutNullPropertiesResult(t);}