开始以为SerializerHelper类是项目中已包含的，后来在别的解决方案中测试代码才发现SerializerHelper类是自己写的。
using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Text;using System.IO;using System.Xml.Serialization;using Newtonsoft.Json;/// <summary>/// SerializerHelper 的摘要说明/// </summary>public static class SerializerHelper{ ???/// <summary> ???/// 反序列化XML文件 ???/// </summary> ???public static T LoadFromXmlFile<T>(string filepath) where T : class ???{ ???????using (FileStream stream = new FileStream(filepath, FileMode.Open, FileAccess.Read)) ???????{ ???????????XmlSerializer serializer = new XmlSerializer(typeof(T)); ???????????return (T)serializer.Deserialize(stream); ???????} ???} ???/// <summary> ???/// 反序列化XML字符串 ???/// </summary> ???public static T LoadFromXmlString<T>(string xml) where T : class ???{ ???????XmlSerializer serializer = new XmlSerializer(typeof(T)); ???????byte[] bytes = Encoding.UTF8.GetBytes(xml); ???????using (MemoryStream stream = new MemoryStream(bytes)) ???????{ ???????????return (T)serializer.Deserialize(stream); ???????} ???} ???/// <summary> ???/// 序列化XML对象 ???/// </summary> ???public static string SaveToXmlString<T>(T entity) where T : class ???{ ???????using (MemoryStream stream = new MemoryStream()) ???????{ ???????????XmlSerializer serializer = new XmlSerializer(typeof(T)); ???????????serializer.Serialize(stream, entity); ???????????return Encoding.UTF8.GetString(stream.ToArray()); ???????} ???} ???/// <summary> ???/// 序列化Json对象 ???/// </summary> ???public static string ToJsonString(object obj) ???{ ???????return ToJsonString<object>(obj); ???} ???/// <summary> ???/// 序列化Json对象 ???/// </summary> ???public static string ToJsonString<T>(T obj) where T : class ???{ ???????string text = JsonConvert.SerializeObject(obj); ???????return text; ???} ???/// <summary> ???/// 反序列化Json字符串 ???/// </summary> ???public static T ToJsonObject<T>(string text) where T : class ???{ ???????T obj = (T)JsonConvert.DeserializeObject(text, typeof(T)); ???????return obj; ???}}Newtonsoft.Json.dll的下载地址（找了半天不知道在哪里添加附件所以只能放我上传的路径了）：
https://files.cnblogs.com/files/swjian/Newtonsoft.Json.rar
.Net 序列化和反序列化SerializerHelper
原文地址：http://www.cnblogs.com/swjian/p/7866922.html