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对于值类型的List直接用以下方法就可以复制: List<T> oldList = new List<T>(); oldList.Add(..); List<T> newList = new List<T>(oldList); 二、List对象中的T是引用类型的情况(例如自定义的实体类)1、对于引用类型的List无法用以上方法进行复制,只会复制List中对象的引用,可以用以下扩展方法复制: static class Extensions { public static IList<T> Clone<T>(this IList<T> listToClone) where T: ICloneable { return listToClone.Select(item => (T)item.Clone()).ToList(); } //<span style="color:#000000;">当然前题是List中的对象要实现ICloneable接口</span> }
2、另一种用序列化的方式对引用对象完成深拷贝,此种方法最可靠 public static T Clone<T>(T RealObject) { using (Stream objectStream = new MemoryStream()) { //利用 System.Runtime.Serialization序列化与反序列化完成引用对象的复制 IFormatter formatter = new BinaryFormatter(); formatter.Serialize(objectStream, RealObject); objectStream.Seek(0, SeekOrigin.Begin); return (T)formatter.Deserialize(objectStream); } } 3、利用System.Xml.Serialization来实现序列化与反序列化 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进行测试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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