关于值范例的List直接用以下要领就能够复制:
List<T> oldList = new List<T>(); oldList.Add(..); List<T> newList = new List<T>(oldList);
二、List<T>对象中的T是援用范例的状况(比方自定义的实体类)
1、关于援用范例的List没法用以上要领举行复制,只会复制List中对象的援用,可以用以下扩大要领复制:
static class Extensions { public static IList<T> Clone<T>(this IList<T> listToClone) where T: ICloneable { return listToClone.Select(item => (T)item.Clone()).ToList(); } //固然前题是List中的对象要完成ICloneable接口 }
2、另一种用序列化的体式格局对援用对象完成深拷贝,此种要领最牢靠
public static T Clone<T>(T RealObject) { using (Stream objectStream = new MemoryStream()) { //应用 System.Runtime.Serialization序列化与反序列化完成援用对象的复制 IFormatter formatter = new BinaryFormatter(); formatter.Serialize(objectStream, RealObject); objectStream.Seek(0, SeekOrigin.Begin); return (T)formatter.Deserialize(objectStream); } }
3、应用System.Xml.Serialization来完成序列化与反序列化
public static T Clone<T>(T RealObject) { using(Stream stream=new MemoryStream()) { XmlSerializer serializer = new XmlSerializer(typeof(T)); serializer.Serialize(stream, RealObject); stream.Seek(0, SeekOrigin.Begin); return (T)serializer.Deserialize(stream); } }
三、对上述几种对象深拷贝举行测试
测试以下:
using System; using System.Collections.Generic; using System.Collections ; using System.Linq; using System.Text; using System.IO; using System.Runtime.Serialization; using System.Runtime.Serialization.Formatters.Binary; namespace LINQ { [Serializable] public class tt { private string name = ""; public string Name { get { return name; } set { name = value; } } private string sex = ""; public string Sex { get { return sex; } set { sex = value; } } } class LINQTest { public static T Clone<T>(T RealObject) { using (Stream objectStream = new MemoryStream()) { IFormatter formatter = new BinaryFormatter(); formatter.Serialize(objectStream, RealObject); objectStream.Seek(0, SeekOrigin.Begin); return (T)formatter.Deserialize(objectStream); } } public static void Main() { List<tt> lsttt = new List<tt>(); tt tt1 = new tt(); tt1.Name = "a1"; tt1.Sex = "20"; lsttt.Add(tt1); List<tt> l333 = new List<tt>(); l333.Add(Clone<tt>(lsttt[0])); l333[0].Name = "333333333"; } } }
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