- A+
所属分类:.NET技术
- 概述
为什么要用到深拷贝呢?比如我们建了某个类Person,并且实例化出一个对象,然后,突然需要把这个对象复制一遍,并且复制出来的对象要跟之前的一模一样,来看下我们一般会怎么做。
- 方法一(利用反射实现)
public static T DeepCopy<T>(T obj) { //如果是字符串或值类型则直接返回 if (obj is string || obj.GetType().IsValueType) return obj; object retval = Activator.CreateInstance(obj.GetType()); FieldInfo[] fields = obj.GetType().GetFields(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Static); foreach (FieldInfo field in fields) { try { field.SetValue(retval, DeepCopy(field.GetValue(obj))); } catch { } } return (T)retval; }
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方法二(利用XML序列化和反序列化实现)
public T DeepCopy<T>(T obj) { object retval; using (MemoryStream ms = new MemoryStream()) { XmlSerializer xml = new XmlSerializer(typeof(T)); xml.Serialize(ms, obj); ms.Seek(0, SeekOrigin.Begin); retval = xml.Deserialize(ms); ms.Close(); } return (T)retval; }
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方法三(利用二进制序列化和反序列实现)
public static T DeepCopy<T>(T obj) { object retval; using (MemoryStream ms = new MemoryStream()) { BinaryFormatter bf = new BinaryFormatter(); //序列化成流 bf.Serialize(ms, obj); ms.Seek(0, SeekOrigin.Begin); //反序列化成对象 retval = bf.Deserialize(ms); ms.Close(); } return (T)retval; }
- 方法四(DataContractSerializer实现)
//利用silverlight DataContractSerializer实现,用于在silverlight 客户端使用 public static T DeepCopy<T>(T obj) { object retval; using (MemoryStream ms = new MemoryStream()) { DataContractSerializer ser = new DataContractSerializer(typeof(T)); ser.WriteObject(ms, obj); ms.Seek(0, SeekOrigin.Begin); retval = ser.ReadObject(ms); ms.Close(); } return (T)retval;
}