Generic StringEnumConverter<T> for C# version < 7.3

StringEnumConverter.cs

using System;
using System.Reflection;
using Newtonsoft.Json.Converters;
public class StringEnumConverter<TEnum> : StringEnumConverter where TEnum : struct, IConvertible
{
    public override bool CanConvert(Type objectType)
    {
        Type t = Nullable.GetUnderlyingType(objectType) ?? objectType;
        return t.IsEnum && t == typeof(TEnum);
    }
}