ShouldSerializeContractResolver.cs

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using System;
using System.Collections;
using System.Reflection;
using Newtonsoft.Json;
using Newtonsoft.Json.Serialization;
 
public class ShouldSerializeContractResolver : DefaultContractResolver
{
    public static readonly ShouldSerializeContractResolver Instance = new ShouldSerializeContractResolver();
 
    protected override JsonProperty CreateProperty(MemberInfo member, MemberSerialization memberSerialization)
    {
        JsonProperty property = base.CreateProperty(member, memberSerialization);
        if (!typeof(string).IsAssignableFrom(property.PropertyType) && typeof(IEnumerable).IsAssignableFrom(property.PropertyType))
        {
            Predicate<object> newShouldSerialize = (object obj) => !(property.ValueProvider.GetValue(obj) is ICollection collection) || collection.Count != 0;
            Predicate<object> oldShouldSerialize = property.ShouldSerialize;
            property.ShouldSerialize = ((oldShouldSerialize != null) ? ((Predicate<object>)((object o) => oldShouldSerialize(o) && newShouldSerialize(o))) : newShouldSerialize);
        }
        return property;
    }
}