junkone junkone - 3 months ago 18
JSON Question

how to set default value to null for datetime variable in Json

i use a json and the class definition is described below

how do i set a default value of null for


[JsonProperty("Time2ATR")]
public DateTime time2atr { get; set; }



so i dont get a default value of "0001-01-01T00:00:00" if i dont assign any value to it?


full code and datasample below


using Newtonsoft.Json;
// This namespace holds all indicators and is required. Do not change it.
namespace NinjaTrader.STSClasses
{
/// <summary>
/// This file holds all user defined indicator methods.
/// </summary>
public class STSmyTrade
{
[JsonProperty("direction")]
public string direction { get; set; }

[JsonProperty("entryprice")]
public double entry { get; set; }

[JsonProperty("exitprice")]
public double exit { get; set; }

[JsonProperty("potentialtarget")]
public double potentialtarget { get; set; }

[JsonProperty("entrytime")]
public DateTime entrytime { get; set; }

[JsonProperty("exittime")]
public DateTime exittime { get; set; }

[JsonProperty("maxfavourable")]
public double mfe { get; set; }

[JsonProperty("maxagainst")]
public double mae { get; set; }


[JsonProperty("maxagainst1ATR")]
public double mae1atr { get; set; }

[JsonProperty("Time1ATR")]
public DateTime time1atr { get; set; }

[JsonProperty("maxagainst2ATR")]
public double mae2atr { get; set; }
[JsonProperty("Time2ATR")]
public DateTime time2atr { get; set; }

[JsonProperty("gains")]
public double gains { get; set; }

[JsonProperty("signal")]
public string signal { get; set; }

[JsonProperty("instrument")]
public string instrument { get; set; }

[JsonProperty("account")]
public string account { get; set; }
[JsonProperty("quantity")]
public int quantity { get; set; }
[JsonProperty("hitedge")]
public bool hitedge { get; set; }
[JsonProperty("RealizedProfitLoss")]
public double RealizedProfitLoss { get; set; }
[JsonProperty("CashValue")]
public double CashValue { get; set; }
[JsonProperty("BuyingPower")]
public double BuyingPower { get; set; }
}
}

{
"direction": "Long",
"entryprice": 1.13211,
"exitprice": 1.13197,
"potentialtarget": 0.00025,
"entrytime": "2016-08-22T13:46:31.7459655-04:00",
"exittime": "2016-08-22T15:46:22.3955682-04:00",
"maxfavourable": 0.00055,
"maxagainst": -0.00035,
"maxagainst1ATR": -0.00035,
"Time1ATR": "0001-01-01T00:00:00",
"maxagainst2ATR": -0.00035,
"Time2ATR": "0001-01-01T00:00:00",
"gains": -0.00015,
"signal": "EnterLongBounce",
"instrument": "$EURUSD",
"account": "InteractiveBrokersindicatorbased",
"quantity": 1,
"hitedge": false,
"RealizedProfitLoss": 0.0,
"CashValue": 0.0,
"BuyingPower": 0.0
}');

Answer

If you want null you have to use Nullable DateTime DateTime?, DateTime is struct and it's default value is "0001-01-01T00:00:00" so it won't ever be null.

Comments