设计模式-原型模式

 原型模式核心就是，深拷贝和浅拷贝。

       原型模式是创建模式中的一种，用于特点是通过一个已存在的实例复制一个新实例，而不是创建新实例（值类型用浅拷贝，而引用类型必须是深拷贝）。被复制的对象我们称作原型，这个原型是可定制的。

 

.net实现深拷贝

  public class DeepCope
    {
        /// <summary>
        /// 对象拷贝
        /// </summary>
        /// <param name="obj">被复制对象</param>
        /// <returns>新对象</returns>
        private object CopyOjbect(object obj)
        {
            if (obj == null)
            {
                return null;
            }
            Object targetDeepCopyObj;
            Type targetType = obj.GetType();
            //值类型  
            if (targetType.IsValueType == true)
            {
                targetDeepCopyObj = obj;
            }
            //引用类型   
            else
            {
                targetDeepCopyObj = System.Activator.CreateInstance(targetType);   //创建引用对象   
                System.Reflection.MemberInfo[] memberCollection = obj.GetType().GetMembers();

                foreach (System.Reflection.MemberInfo member in memberCollection)
                {
                    //拷贝字段
                    if (member.MemberType == System.Reflection.MemberTypes.Field)
                    {
                        System.Reflection.FieldInfo field = (System.Reflection.FieldInfo)member;
                        Object fieldValue = field.GetValue(obj);
                        if (fieldValue is ICloneable)
                        {
                            field.SetValue(targetDeepCopyObj, (fieldValue as ICloneable).Clone());
                        }
                        else
                        {
                            field.SetValue(targetDeepCopyObj, CopyOjbect(fieldValue));
                        }

                    }//拷贝属性
                    else if (member.MemberType == System.Reflection.MemberTypes.Property)
                    {
                        System.Reflection.PropertyInfo myProperty = (System.Reflection.PropertyInfo)member;

                        MethodInfo info = myProperty.GetSetMethod(false);
                        if (info != null)
                        {
                            try
                            {
                                object propertyValue = myProperty.GetValue(obj, null);
                                if (propertyValue is ICloneable)
                                {
                                    myProperty.SetValue(targetDeepCopyObj, (propertyValue as ICloneable).Clone(), null);
                                }
                                else
                                {
                                    myProperty.SetValue(targetDeepCopyObj, CopyOjbect(propertyValue), null);
                                }
                            }
                            catch (Exception ex)
                            {
                                // ignored
                            }
                        }
                    }
                }
            }
            return targetDeepCopyObj;
        }
    }