C# JSON序列化

using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CommonLib.SerializerUtils
{
    /// <summary>
    /// JSON序列化帮助类
    /// </summary>
    public sealed class JsonHelper
    {
        /// <summary>
        /// 全家桶转换参数
        /// </summary>
        public static JsonSerializerSettings DefaultSettings => new JsonSerializerSettings
        {
            Formatting = Formatting.Indented,
            NullValueHandling = NullValueHandling.Include,
            MissingMemberHandling = MissingMemberHandling.Ignore,
            TypeNameHandling = TypeNameHandling.All,
        };

        /// <summary>
        /// 格式化转换参数
        /// </summary>
        public static JsonSerializerSettings FormatSettings => new JsonSerializerSettings { Formatting = Formatting.Indented };

        /// <summary>
        /// 序列化
        /// </summary>
        /// <typeparam name="T">序列化的对象的类型</typeparam>
        /// <param name="obj">序列化的对象</param>
        /// <param name="settings">序列化参数，默认为空。</param>
        /// <returns></returns>
        public static string Serialize<T>(T obj, JsonSerializerSettings settings = null) where T : class
        {
            if (settings == null)
            {
                return JsonConvert.SerializeObject(obj);
            }
            else
            {
                return JsonConvert.SerializeObject(obj, settings);
            }

        }

        /// <summary>
        /// 反序列化
        /// </summary>
        /// <typeparam name="T">返回对象类型</typeparam>
        /// <param name="jsonStr">json字符串</param>
        /// <param name="settings">反序列化参数，默认为空。</param>
        /// <returns></returns>
        public static T Deserialize<T>(string jsonStr, JsonSerializerSettings settings = null) where T : class
        {
            if (settings == null)
            {
                return JsonConvert.DeserializeObject<T>(jsonStr);
            }
            else
            {
                return JsonConvert.DeserializeObject<T>(jsonStr, settings);
            }
        }

        /// <summary>
        /// 复制对象
        /// </summary>
        /// <typeparam name="T">对象类型</typeparam>
        /// <param name="obj">要复制的对象</param>
        /// <returns></returns>
        public static T ObjCopy<T>(T obj) where T : class
        {
            return JsonConvert.DeserializeObject<T>(JsonConvert.SerializeObject(obj));
        }
    }
}