克隆对象的几种方法

　　克隆对象在开发过程中经常会遇到，有些时候需要浅克隆，有些时候需要深克隆，具体它们之间有什么区别，以及实现方式有哪些，在这里总结一下。

　　实现深克隆有以下几种方法。

手动

代码如下：

//手动复制
var user2 = new User
{
	Id = user1.Id,
	Name = new UserName 
	{
		FirstName= user1.Name.FirstName,
		LastName= user1.Name.LastName
	}
};

 

反射

代码如下：

1 //反射
2 var user3 = user1.Copy() as User;

 

扩展方法：

 1 public static class DeepCopyHelper
 2 {
 3     public static object Copy(this object obj)
 4     {
 5         Object targetDeepCopyObj;
 6         Type targetType = obj.GetType();
 7         //值类型
 8         if (targetType.IsValueType == true)
 9         {
10             targetDeepCopyObj = obj;
11         }
12         //引用类型 
13         else
14         {
15             targetDeepCopyObj = System.Activator.CreateInstance(targetType);   //创建引用对象 
16             System.Reflection.MemberInfo[] memberCollection = obj.GetType().GetMembers();
17 
18             foreach (System.Reflection.MemberInfo member in memberCollection)
19             {
20                 if (member.MemberType == System.Reflection.MemberTypes.Field)
21                 {
22                     System.Reflection.FieldInfo field = (System.Reflection.FieldInfo)member;
23                     Object fieldValue = field.GetValue(obj);
24                     if (fieldValue is ICloneable)
25                     {
26                         field.SetValue(targetDeepCopyObj, (fieldValue as ICloneable).Clone());
27                     }
28                     else
29                     {
30                         field.SetValue(targetDeepCopyObj, Copy(fieldValue));
31                     }
32 
33                 }
34                 else if (member.MemberType == System.Reflection.MemberTypes.Property)
35                 {
36                     System.Reflection.PropertyInfo myProperty = (System.Reflection.PropertyInfo)member;
37                     MethodInfo info = myProperty.GetSetMethod(false);
38                     if (info != null)
39                     {
40                         object propertyValue = myProperty.GetValue(obj, null);
41                         if (propertyValue is ICloneable)
42                         {
43                             myProperty.SetValue(targetDeepCopyObj, (propertyValue as ICloneable).Clone(), null);
44                         }
45                         else
46                         {
47                             myProperty.SetValue(targetDeepCopyObj, Copy(propertyValue), null);
48                         }
49                     }
50 
51                 }
52             }
53         }
54         return targetDeepCopyObj;
55     }
56 }

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