当前位置： 首页 > news >正文

域名网站是什么网络营销外包收费

news 2025/7/8 13:24:55
域名网站是什么,网络营销外包收费,网站优化排名金苹果系统,wecenter wordpress本文章主要介绍C#中对象的拷贝，其中包括浅拷贝和深拷贝，以及浅拷贝和深拷贝的实现方式，不同的实现方式之间的性能对比。 1、浅拷贝和深拷贝 浅拷贝是指将对象中的数值类型的字段拷贝到新的对象中，而对象中的引用型字段则指复制它…

本文章主要介绍C#中对象的拷贝，其中包括浅拷贝和深拷贝，以及浅拷贝和深拷贝的实现方式，不同的实现方式之间的性能对比。

 

1、浅拷贝和深拷贝

浅拷贝是指将对象中的数值类型的字段拷贝到新的对象中，而对象中的引用型字段则指复制它的一个引用到目标对象。如果改变目标对象中引用型字段的值他将反映在原是对象中，也就是说原始对象中对应的字段也会发生变化。深拷贝与浅拷贝不同的是对于引用的处理，深拷贝将会在新对象中创建一个新的和原是对象中对应字段相同（内容相同）的字段，也就是说这个引用和原是对象的引用是不同的，我们在改变新对象中的这个字段的时候是不会影响到原始对象中对应字段的内容。

2、浅拷贝实现方式

1）new对象赋值

[Serializable]
class Employee
{public string ID { get; set; }public int Age { get; set; }public Department DepartmentName { get; set; }
}
[Serializable]
class Department
{public string DepartmentName { get; set; }public Department(string value){DepartmentName = value;}public override string ToString(){return DepartmentName.ToString();}
}
Employee emp1 = new Employee()
{ID = "cjavapy",Age = 20,DepartmentName = new Department("develop")
}
;
Employee emp2=new Employee()
{ID=emp1.ID,Age=emp1.Age,DepartmentName=emp1.DepartmentName
};

 2）实现ICloneable接口

class Employee : ICloneable
{public string ID { get; set; }public int Age { get; set; }public Department DepartmentName { get; set; }//实现ICloneable接口的Clone方法public object Clone(){return this.MemberwiseClone();//浅拷贝}
}
class Department
{public string DepartmentName { get; set; }public Department(string value){DepartmentName = value;}public override string ToString(){return DepartmentName.ToString();}
}

 浅拷贝:

Employee emp1 = new Employee()
{ID = "cjavapy",Age = 20,DepartmentName = new Department("develop")
};
Employee emp2 = emp1.Clone() as Employee;//浅拷贝

 

3、深拷贝实现方式

1）二进制序列化

using System;
using System.Collections.Generic;
using System.IO;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Binary;
using System.Xml.Serialization;
using Newtonsoft.Json;namespace ConsoleApplication
{public class Utils{public static T BinaryClone<T>(T source){if (!typeof(T).IsSerializable){throw new ArgumentException("需要添加[Serializable]标签", "source");}if (Object.ReferenceEquals(source, null)){return default(T);}IFormatter formatter = new BinaryFormatter();Stream stream = new MemoryStream();using (stream){formatter.Serialize(stream, source);stream.Seek(0, SeekOrigin.Begin);return (T)formatter.Deserialize(stream);}}}}

 2）JSON序列化

using System.Collections.Generic;
using System.IO;
using System.Xml.Serialization;
using Newtonsoft.Json;namespace ConsoleApplication
{public class Utils{/// /// 序列化反序列化方式/// /// /// public static TOut JsonClone<TIn,TOut>(TIn tIn){return JsonConvert.DeserializeObject<TOut>(JsonConvert.SerializeObject(tIn));}}}

 3）Reflection反射

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;namespace ConsoleApplication
{public class Utils{/// /// 反射实现深拷贝/// /// 传入TIn对象返回TOut对象/// public static TOut ReflectionClone<TIn, TOut>(TIn tIn){TOut tOut = Activator.CreateInstance<TOut>();foreach (var itemOut in tOut.GetType().GetProperties()){var propIn = tIn.GetType().GetProperty(itemOut.Name);itemOut.SetValue(tOut, propIn.GetValue(tIn));}foreach (var itemOut in tOut.GetType().GetFields()){var fieldIn = tIn.GetType().GetField(itemOut.Name);itemOut.SetValue(tOut, fieldIn.GetValue(tIn));}return tOut;}/// <summary>/// 传入List<TIn>，返回List<TOut>/// </summary>/// <typeparam name="TIn"></typeparam>/// <typeparam name="TOut"></typeparam>/// <param name="tInList"></param>/// <returns></returns>public static List<TOut> ReflectionCloneList<TIn, TOut>(List<TIn> tInList){List<TOut> result = new List<TOut>();foreach (var tIn in tInList){TOut tOut = Activator.CreateInstance<TOut>();foreach (var itemOut in tOut.GetType().GetProperties()){var propIn = tIn.GetType().GetProperty(itemOut.Name);itemOut.SetValue(tOut, propIn.GetValue(tIn));}foreach (var itemOut in tOut.GetType().GetFields()){var fieldIn = tIn.GetType().GetField(itemOut.Name);itemOut.SetValue(tOut, fieldIn.GetValue(tIn));}result.Add(tOut);}return result;}}public class ContactPerson{public string Name { get; set; }public string MobileNum { get; set; }}class Program{static void Main(string[] args){var persons = new List<ContactPerson>{new ContactPerson { Name= "C", MobileNum = "13756863001"},new ContactPerson { Name = "C#", MobileNum = "13756863002"},new ContactPerson { Name = "Java", MobileNum = "13756863003"}};var result = Utils.ReflectionCloneList<ContactPerson, ContactPerson>(persons);foreach(var p in result)Console.WriteLine("姓名: {0} 号码为: {1}", p.Name, p.MobileNum);Console.Read();}}
}

 4）XML序列化

using System.IO;
using System.Xml.Serialization;namespace ConsoleApplication
{public class Utils{public static T DeserializeXML<T>(string xmlData) where T : new(){if (string.IsNullOrEmpty(xmlData))return default(T);TextReader tr = new StringReader(xmlData);T DocItms = new T();XmlSerializer xms = new XmlSerializer(DocItms.GetType());DocItms = (T)xms.Deserialize(tr);return DocItms == null ? default(T) : DocItms;}}
}

 5）表达式目录树

using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Text;
using System.Threading.Tasks;namespace ConsoleApplication
{/// <summary>/// 生成表达式目录树  泛型缓存/// </summary>/// <typeparam name="TIn"></typeparam>/// <typeparam name="TOut"></typeparam>public class ExpressionGenericMapper<TIn, TOut>//`2{private static Func<TIn, TOut> _FUNC = null;static ExpressionGenericMapper(){ParameterExpression parameterExpression = Expression.Parameter(typeof(TIn), "p");List<MemberBinding> memberBindingList = new List<MemberBinding>();foreach (var item in typeof(TOut).GetProperties()){MemberExpression property = Expression.Property(parameterExpression, typeof(TIn).GetProperty(item.Name));MemberBinding memberBinding = Expression.Bind(item, property);memberBindingList.Add(memberBinding);}foreach (var item in typeof(TOut).GetFields()){MemberExpression property = Expression.Field(parameterExpression, typeof(TIn).GetField(item.Name));MemberBinding memberBinding = Expression.Bind(item, property);memberBindingList.Add(memberBinding);}MemberInitExpression memberInitExpression = Expression.MemberInit(Expression.New(typeof(TOut)), memberBindingList.ToArray());Expression<Func<TIn, TOut>> lambda = Expression.Lambda<Func<TIn, TOut>>(memberInitExpression, new ParameterExpression[]{parameterExpression});_FUNC = lambda.Compile();//}public static TOut Trans(TIn t){return _FUNC(t);}}
}

 

4、拷贝方式性能对比

对比代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Text;
using System.Threading.Tasks;
using System.Diagnostics;
using System.Xml.Serialization;
using System.IO;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Binary;
using Newtonsoft.Json;namespace ConsoleApplication
{class Program{static void Main(string[] args){Employee emp1 = new Employee(){ID = "cjavapy",Age = 20,DepartmentName = new Department("develop")};long common = 0;long expression = 0;long json = 0;long xml = 0;long binary = 0;long reflection = 0;{Stopwatch watch = new Stopwatch();watch.Start();for (int i = 0; i < 1000000; i++){Employee copy = BinaryClone<Employee>(emp1);}watch.Stop();binary = watch.ElapsedMilliseconds;}{Stopwatch watch = new Stopwatch();watch.Start();for (int i = 0; i < 1000000; i++){Employee copy = ReflectionClone<Employee, Employee>(emp1);}watch.Stop();reflection = watch.ElapsedMilliseconds;}{Stopwatch watch = new Stopwatch();watch.Start();for (int i = 0; i < 1000000; i++){Employee copy = DeserializeXML<Employee>(SerializeXML<Employee>(emp1));}watch.Stop();xml = watch.ElapsedMilliseconds;}{Stopwatch watch = new Stopwatch();watch.Start();for (int i = 0; i < 1000000; i++){Employee copy = JsonClone<Employee, Employee>(emp1);}watch.Stop();json = watch.ElapsedMilliseconds;}{Stopwatch watch = new Stopwatch();watch.Start();for (int i = 0; i < 1000000; i++){Employee copy = ExpressionGeneric<Employee, Employee>.Clone(emp1);}watch.Stop();expression = watch.ElapsedMilliseconds;}Console.WriteLine($"binary = { binary} ms");Console.WriteLine($"reflection = { reflection} ms");Console.WriteLine($"serialize = { xml} ms");Console.WriteLine($"json = { json} ms");Console.WriteLine($"generic = { expression} ms");Console.ReadKey();}public static T BinaryClone<T>(T source){if (!typeof(T).IsSerializable){throw new ArgumentException("需要添加[Serializable]标签", "source");}if (Object.ReferenceEquals(source, null)){return default(T);}IFormatter formatter = new BinaryFormatter();Stream stream = new MemoryStream();using (stream){formatter.Serialize(stream, source);stream.Seek(0, SeekOrigin.Begin);return (T)formatter.Deserialize(stream);}}/// <summary>/// 反射/// </summary>/// <typeparam name="TIn"></typeparam>/// <typeparam name="TOut"></typeparam>/// <param name="tIn"></param>/// <returns></returns>public static TOut ReflectionClone<TIn, TOut>(TIn tIn){TOut tOut = Activator.CreateInstance<TOut>();foreach (var itemOut in tOut.GetType().GetProperties()){var propIn = tIn.GetType().GetProperty(itemOut.Name);itemOut.SetValue(tOut, propIn.GetValue(tIn));}foreach (var itemOut in tOut.GetType().GetFields()){var fieldIn = tIn.GetType().GetField(itemOut.Name);itemOut.SetValue(tOut, fieldIn.GetValue(tIn));}return tOut;}public static TOut JsonClone<TIn, TOut>(TIn tIn){return JsonConvert.DeserializeObject<TOut>(JsonConvert.SerializeObject(tIn));}public static string SerializeXML<T>(T t){using (StringWriter sw = new StringWriter()){XmlSerializer xz = new XmlSerializer(t.GetType());xz.Serialize(sw, t);return sw.ToString();}}public static T DeserializeXML<T>(string xmlData) where T : new(){if (string.IsNullOrEmpty(xmlData))return default(T);TextReader tr = new StringReader(xmlData);T DocItms = new T();XmlSerializer xms = new XmlSerializer(DocItms.GetType());DocItms = (T)xms.Deserialize(tr);return DocItms == null ? default(T) : DocItms;}}[Serializable]public class Employee : ICloneable{public string ID { get; set; }public int Age { get; set; }public Department DepartmentName { get; set; }//实现ICloneable接口的Clone方法public object Clone(){return this.MemberwiseClone();//浅拷贝}}[Serializable]public class Department{public string DepartmentName { get; set; }public Department(){}public Department(string value){DepartmentName = value;}public override string ToString(){return DepartmentName.ToString();}}/// <typeparam name="TIn"></typeparam>/// <typeparam name="TOut"></typeparam>public class ExpressionGeneric<TIn, TOut>//Mapper`2{private static Func<TIn, TOut> _FUNC = null;static ExpressionGeneric(){ParameterExpression parameterExpression = Expression.Parameter(typeof(TIn), "p");List<MemberBinding> memberBindingList = new List<MemberBinding>();foreach (var item in typeof(TOut).GetProperties()){MemberExpression property = Expression.Property(parameterExpression, typeof(TIn).GetProperty(item.Name));MemberBinding memberBinding = Expression.Bind(item, property);memberBindingList.Add(memberBinding);}foreach (var item in typeof(TOut).GetFields()){MemberExpression property = Expression.Field(parameterExpression, typeof(TIn).GetField(item.Name));MemberBinding memberBinding = Expression.Bind(item, property);memberBindingList.Add(memberBinding);}MemberInitExpression memberInitExpression = Expression.MemberInit(Expression.New(typeof(TOut)), memberBindingList.ToArray());Expression<Func<TIn, TOut>> lambda = Expression.Lambda<Func<TIn, TOut>>(memberInitExpression, new ParameterExpression[]{parameterExpression});_FUNC = lambda.Compile();}public static TOut Clone(TIn t){return _FUNC(t);}}
}

 

http://www.zhongyajixie.com/news/4211.html

相关文章：

  • 多用户商城网站百度竞价多少钱一个点击
  • 做有支付系统的网站一般需要多少钱百度地图3d实景地图
  • 河北项目网百度关键词优化公司
  • 长期供应网站设计制作seo实战论坛
  • 云南做网站哪家便宜吸引人气的营销方案
  • 外卖网站开发方案个人如何在百度做广告
  • 南通外贸网站推广百度收录网站
  • 顺义建站公司中国500强最新排名
  • 有没有人通过网站建设卖东西的市场营销毕业后做什么工作
  • 个人做电子商务网站企业邮箱格式
  • 一元夺宝网站开发外贸谷歌优化
  • 网站制作企业首页济南seo优化公司助力排名
  • 怎么做网站导航栏廊坊网站设计
  • 网站建设做哪 个会计科目佛山优化网站关键词
  • 微网站模板源代码营销公司排行
  • 和幼儿做网站福州网站排名推广
  • 金汇网站建设网络营销案例ppt
  • 中国建设部门官方网站东莞做好网络推广
  • 做网站不想用微软雅黑了网络推广有前途吗
  • 企业做网站都购买域名吗网站快速优化排名app
  • 怎么做移动网站吗企业管理软件
  • 北京和田合瑞建设有限公司网站黑帽seo是什么意思
  • 昌平网站建设微信公众号软文怎么写
  • 南京做网站的公司百度写一篇文章多少钱
  • 宁国网站建设长沙网站策划
  • 营销网站制作设计常用的网站推广方法
  • 网站开发培训班2023第二波疫情已经到来
  • 国外成人做视频网站怎么在平台上做推广
  • 一个网站可以做多个描述吗广州网站营销seo
  • 河南大学学科建设处网站廊坊关键词优化平台