c# 對象轉JSON當為null時忽略

學習之后，在這里記錄一下

using System;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;

class EngineScoreSubWord
{
//[JsonProperty(NullValueHandling=NullValueHandling.Ignore)]
public string subtext { get; set; }
public float volume { get; set; }
public float begin { get; set; }
public float end { get; set; }
[JsonProperty(NullValueHandling=NullValueHandling.Ignore)]
public float? score { get; set; } //add by grq 
}