using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Linq.Expressions;
using System.Reflection;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Binary;
using System.Text;
using System.Threading.Tasks;
using System.Xml.Serialization;
namespace DeepCopy
{
public class DeepCopyHelper
{
// 用一个字典来存放每个对象的反射次数来避免反射代码的循环递归
static Dictionary<Type, int> typereflectionCountDic = new Dictionary<Type, int>();
static object DeepCopyDemoClasstypeRef = null;
// 利用反射实现深拷贝
public static T DeepCopyWithReflection<T>(T obj)
{
Type type = obj.GetType();
// 如果是字符串或值类型则直接返回
if (obj is string || type.IsValueType) return obj;
if (type.IsArray)
{
Type elementType = Type.GetType(type.FullName.Replace("[]", string.Empty));
var array = obj as Array;
Array copied = Array.CreateInstance(elementType, array.Length);
for (int i = 0; i < array.Length; i++)
{
copied.SetValue(DeepCopyWithReflection(array.GetValue(i)), i);
}
return (T)Convert.ChangeType(copied, obj.GetType());
}
object retval = Activator.CreateInstance(obj.GetType());
PropertyInfo[] properties = obj.GetType().GetProperties(
BindingFlags.Public | BindingFlags.NonPublic
| BindingFlags.Instance | BindingFlags.Static);
foreach (var property in properties)
{
var propertyValue = property.GetValue(obj, null);
if (propertyValue == null)
continue;
property.SetValue(retval, DeepCopyWithReflection(propertyValue), null);
}
return (T)retval;
}
public static T DeepCopyWithReflection_Second<T>(T obj)
{
Type type = obj.GetType();
// 如果是字符串或值类型则直接返回
if (obj is string || type.IsValueType) return obj;
if (type.IsArray)
{
Type elementType = Type.GetType(type.FullName.Replace("[]", string.Empty));
var array = obj as Array;
Array copied = Array.CreateInstance(elementType, array.Length);
for (int i = 0; i < array.Length; i++)
{
copied.SetValue(DeepCopyWithReflection_Second(array.GetValue(i)), i);
}
return (T)Convert.ChangeType(copied, obj.GetType());
}
// 对于类类型开始记录对象反射的次数
int reflectionCount = Add(typereflectionCountDic, obj.GetType());
if (reflectionCount > 1)
return obj;
object retval = Activator.CreateInstance(obj.GetType());
PropertyInfo[] properties = obj.GetType().GetProperties(
BindingFlags.Public | BindingFlags.NonPublic
| BindingFlags.Instance | BindingFlags.Static);
foreach (var property in properties)
{
var propertyValue = property.GetValue(obj, null);
if (propertyValue == null)
continue;
property.SetValue(retval, DeepCopyWithReflection_Second(propertyValue), null);
}
return (T)retval;
}
public static T DeepCopyWithReflection_Third<T>(T obj)
{
Type type = obj.GetType();
// 如果是字符串或值类型则直接返回
if (obj is string || type.IsValueType) return obj;
if (type.IsArray)
{
Type elementType = Type.GetType(type.FullName.Replace("[]", string.Empty));
var array = obj as Array;
Array copied = Array.CreateInstance(elementType, array.Length);
for (int i = 0; i < array.Length; i++)
{
copied.SetValue(DeepCopyWithReflection_Second(array.GetValue(i)), i);
}
return (T)Convert.ChangeType(copied, obj.GetType());
}
int reflectionCount = Add(typereflectionCountDic, obj.GetType());
if (reflectionCount > 1 && obj.GetType() == typeof(DeepCopyDemoClass))
return (T)DeepCopyDemoClasstypeRef; // 返回deepCopyClassB对象
object retval = Activator.CreateInstance(obj.GetType());
if(retval.GetType() == typeof(DeepCopyDemoClass))
DeepCopyDemoClasstypeRef = retval; // 保存一开始创建的DeepCopyDemoClass对象
PropertyInfo[] properties = obj.GetType().GetProperties(
BindingFlags.Public | BindingFlags.NonPublic
| BindingFlags.Instance | BindingFlags.Static);
foreach (var property in properties)
{
var propertyValue = property.GetValue(obj, null);
if (propertyValue == null)
continue;
property.SetValue(retval, DeepCopyWithReflection_Third(propertyValue), null);
}
return (T)retval;
}
private static T SetArrayObject<T>(T arrayObj)
{
Type elementType = Type.GetType(arrayObj.GetType().FullName.Replace("[]", string.Empty));
var array = arrayObj as Array;
Array copied = Array.CreateInstance(elementType, array.Length);
for (int i = 0; i < array.Length; i++)
{
copied.SetValue(DeepCopyWithReflection_Third(array.GetValue(i)), i);
}
return (T)Convert.ChangeType(copied, arrayObj.GetType());
}
private static int Add(Dictionary<Type, int> dict, Type key)
{
if (key.Equals(typeof(String)) || key.IsValueType) return 0;
if (!dict.ContainsKey(key))
{
dict.Add(key, 1);
return dict[key];
}
dict[key] += 1;
return dict[key];
}
// 利用XML序列化和反序列化实现
public static T DeepCopyWithXmlSerializer<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;
}
// 利用二进制序列化和反序列实现
public static T DeepCopyWithBinarySerialize<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;
}
// 利用DataContractSerializer序列化和反序列化实现
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;
}
// 表达式树实现
// ....
public static class TransExpV2<TIn, TOut>
{
private static readonly Func<TIn, TOut> cache = GetFunc();
private static Func<TIn, TOut> GetFunc()
{
ParameterExpression parameterExpression = Expression.Parameter(typeof(TIn), "p");
List<MemberBinding> memberBindingList = new List<MemberBinding>();
foreach (var item in typeof(TOut).GetProperties())
{
if (!item.CanWrite)
continue;
MemberExpression property = Expression.Property(parameterExpression, typeof(TIn).GetProperty(item.Name));
MemberBinding memberBinding = Expression.Bind(item, property);
memberBindingList.Add(memberBinding);
}
MemberInitExpression memberInitExpression = Expression.MemberInit(Expression.New(typeof(TOut)), memberBindingList.ToArray());
Expression<Func<TIn, TOut>> lambda = Expression.Lambda<Func<TIn, TOut>>(memberInitExpression, new ParameterExpression[] { parameterExpression });
return lambda.Compile();
}
public static TOut Trans(TIn tIn)
{
return cache(tIn);
}
}
}
}
