c# 使用Json.NET实现json序列化

using Newtonsoft.Json;

/// <summary>
/// Newtonsoft.Json的扩展方法类
/// </summary>
public static class NewtonsoftJsonExtension
{
    /// <summary>
    /// 将Json字符串反序列化为对象实例——Newtonsoft.Json
    /// </summary>
    /// <typeparam name="T">对象类型</typeparam>
    /// <param name="jsonString">Json字符串</param>
    /// <returns>对象实例</returns>
    public static T DeserializeObjectFromJson_NJ<T>(this string jsonString)
    {
        return JsonConvert.DeserializeObject<T>(jsonString);
    }

    /// <summary>
    /// 将对象实例序列化为Json字符串——Newtonsoft.Json
    /// </summary>
    /// <typeparam name="T">对象类型</typeparam>
    /// <param name="obj">对象实例</param>
    /// <returns>Json字符串</returns>
    public static string SerializeObjectToJson_NJ<T>(this T obj)
    {
        return JsonConvert.SerializeObject(obj);
    }
}

using System;
using System.Collections.Generic;
using System.IO;
using System.Runtime.Serialization.Json;
using System.Text;

/// <summary>
/// System.Runtime.Serialization.Json扩展方法类（[DataContract]和[DataMember]联合使用来标记被序列化的字段）
/// </summary>
public static class SerializationJsonExtension
{
    private static Dictionary<Type, DataContractJsonSerializer> serDic = new Dictionary<Type, DataContractJsonSerializer>();

    private static DataContractJsonSerializer GetSerializer(Type type)
    {
        if (!serDic.ContainsKey(type))
        {
            serDic.Add(type, new DataContractJsonSerializer(type));
        }
        return serDic[type];
    }

    /// <summary>
    /// 将Json字符串反序列化为对象实例——System.Runtime.Serialization.Json（[DataContract]和[DataMember]联合使用来标记被序列化的字段）
    /// </summary>
    /// <typeparam name="T">对象类型</typeparam>
    /// <param name="jsonString">Json字符串</param>
    /// <returns>对象实例</returns>
    public static T DeserializeObjectFromJson_SJ<T>(this string jsonString)
    {
        var ser = GetSerializer(typeof(T));

        using (var ms = new MemoryStream(Encoding.UTF8.GetBytes(jsonString)))
        {
            T jsonObject = (T)ser.ReadObject(ms);
            return jsonObject;
        }
    }

    /// <summary>
    /// 将对象实例序列化为Json字符串——System.Runtime.Serialization.Json（[DataContract]和[DataMember]联合使用来标记被序列化的字段）
    /// </summary>
    /// <typeparam name="T">对象类型</typeparam>
    /// <param name="obj">对象实例</param>
    /// <returns>Json字符串</returns>
    public static string SerializeObjectToJson_SJ<T>(this T obj)
    {
        var ser = GetSerializer(typeof(T));

        using (var ms = new MemoryStream())
        {
            ser.WriteObject(ms, obj);
            ms.Position = 0;
            using (var sr = new StreamReader(ms, Encoding.UTF8))
            {
                return sr.ReadToEnd();
            }
        }
    }
}