V1.2
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277
CapMachine.Core/DeepCopyHelper.cs
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277
CapMachine.Core/DeepCopyHelper.cs
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Linq.Expressions;
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using System.Reflection;
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using System.Runtime.Serialization.Formatters.Binary;
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using System.Text;
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using System.Threading.Tasks;
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using System.Xml.Serialization;
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namespace CapMachine.Core
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{
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public class DeepCopyHelper
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{
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// 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
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static readonly Dictionary<Type, int> TypereflectionCountDic = new Dictionary<Type, int>();
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//static object _deepCopyDemoClasstypeRef = null;
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// 利用反射实现深拷贝
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public static T DeepCopyWithReflection<T>(T obj)
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{
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Type type = obj.GetType();
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// 如果是字符串或值类型则直接返回
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if (obj is string || type.IsValueType) return obj;
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if (type.IsArray)
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{
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if (type.FullName != null)
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{
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Type elementType = Type.GetType(type.FullName.Replace("[]", string.Empty));
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var array = obj as Array;
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if (array != null)
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{
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Array copied = Array.CreateInstance(elementType ?? throw new InvalidOperationException(), array.Length);
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for (int i = 0; i < array.Length; i++)
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{
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copied.SetValue(DeepCopyWithReflection(array.GetValue(i)), i);
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}
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return (T)Convert.ChangeType(copied, obj.GetType());
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}
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}
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}
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object retval = Activator.CreateInstance(obj.GetType());
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PropertyInfo[] properties = obj.GetType().GetProperties(
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BindingFlags.Public | BindingFlags.NonPublic
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| BindingFlags.Instance | BindingFlags.Static);
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foreach (var property in properties)
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{
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var propertyValue = property.GetValue(obj, null);
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if (propertyValue == null)
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continue;
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property.SetValue(retval, DeepCopyWithReflection(propertyValue), null);
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}
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return (T)retval;
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}
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public static T DeepCopyWithReflection_Second<T>(T obj)
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{
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Type type = obj.GetType();
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// 如果是字符串或值类型则直接返回
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if (obj is string || type.IsValueType) return obj;
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if (type.IsArray)
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{
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if (type.FullName != null)
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{
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Type elementType = Type.GetType(type.FullName.Replace("[]", string.Empty));
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var array = obj as Array;
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if (array != null)
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{
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Array copied = Array.CreateInstance(elementType ?? throw new InvalidOperationException(), array.Length);
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for (int i = 0; i < array.Length; i++)
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{
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copied.SetValue(DeepCopyWithReflection_Second(array.GetValue(i)), i);
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}
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return (T)Convert.ChangeType(copied, obj.GetType());
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}
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}
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}
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// 对于类类型开始记录对象反射的次数
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int reflectionCount = Add(TypereflectionCountDic, obj.GetType());
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if (reflectionCount > 1)
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return obj;
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object retval = Activator.CreateInstance(obj.GetType());
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PropertyInfo[] properties = obj.GetType().GetProperties(
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BindingFlags.Public | BindingFlags.NonPublic
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| BindingFlags.Instance | BindingFlags.Static);
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foreach (var property in properties)
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{
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var propertyValue = property.GetValue(obj, null);
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if (propertyValue == null)
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continue;
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property.SetValue(retval, DeepCopyWithReflection_Second(propertyValue), null);
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}
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return (T)retval;
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}
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//public static T DeepCopyWithReflection_Third<T>(T obj)
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//{
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// Type type = obj.GetType();
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// // 如果是字符串或值类型则直接返回
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// if (obj is string || type.IsValueType) return obj;
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// if (type.IsArray)
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// {
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// Type elementType = Type.GetType(type.FullName.Replace("[]", string.Empty));
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// var array = obj as Array;
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// Array copied = Array.CreateInstance(elementType, array.Length);
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// for (int i = 0; i < array.Length; i++)
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// {
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// copied.SetValue(DeepCopyWithReflection_Second(array.GetValue(i)), i);
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// }
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// return (T) Convert.ChangeType(copied, obj.GetType());
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// }
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// int reflectionCount = Add(typereflectionCountDic, obj.GetType());
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// if (reflectionCount > 1 && obj.GetType() == typeof(DeepCopyDemoClass))
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// return (T) DeepCopyDemoClasstypeRef; // 返回deepCopyClassB对象
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// object retval = Activator.CreateInstance(obj.GetType());
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// if (retval.GetType() == typeof(DeepCopyDemoClass))
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// DeepCopyDemoClasstypeRef = retval; // 保存一开始创建的DeepCopyDemoClass对象
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// PropertyInfo[] properties = obj.GetType().GetProperties(
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// BindingFlags.Public | BindingFlags.NonPublic
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// | BindingFlags.Instance | BindingFlags.Static);
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// foreach (var property in properties)
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// {
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// var propertyValue = property.GetValue(obj, null);
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// if (propertyValue == null)
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// continue;
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// property.SetValue(retval, DeepCopyWithReflection_Third(propertyValue), null);
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// }
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// return (T) retval;
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//}
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//private static T SetArrayObject<T>(T arrayObj)
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//{
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// Type elementType = Type.GetType(arrayObj.GetType().FullName.Replace("[]", string.Empty));
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// var array = arrayObj as Array;
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// Array copied = Array.CreateInstance(elementType, array.Length);
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// for (int i = 0; i < array.Length; i++)
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// {
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// copied.SetValue(DeepCopyWithReflection_Third(array.GetValue(i)), i);
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// }
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// return (T) Convert.ChangeType(copied, arrayObj.GetType());
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//}
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private static int Add(Dictionary<Type, int> dict, Type key)
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{
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if (key == typeof(string) || key.IsValueType) return 0;
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if (!dict.ContainsKey(key))
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{
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dict.Add(key, 1);
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return dict[key];
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}
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dict[key] += 1;
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return dict[key];
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}
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// 利用XML序列化和反序列化实现
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public static T DeepCopyWithXmlSerializer<T>(T obj)
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{
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object retval;
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using (MemoryStream ms = new MemoryStream())
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{
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XmlSerializer xml = new XmlSerializer(typeof(T));
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xml.Serialize(ms, obj);
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ms.Seek(0, SeekOrigin.Begin);
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retval = xml.Deserialize(ms);
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ms.Close();
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}
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return (T)retval;
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}
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// 利用二进制序列化和反序列实现（亲测有用）
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public static T DeepCopyWithBinarySerialize<T>(T obj)
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{
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object retval;
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using (MemoryStream ms = new MemoryStream())
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{
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BinaryFormatter bf = new BinaryFormatter();
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// 序列化成流
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bf.Serialize(ms, obj);
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ms.Seek(0, SeekOrigin.Begin);
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// 反序列化成对象
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retval = bf.Deserialize(ms);
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ms.Close();
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}
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return (T)retval;
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}
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// 利用DataContractSerializer序列化和反序列化实现
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//public static T DeepCopy<T>(T obj)
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//{
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// object retval;
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// using (MemoryStream ms = new MemoryStream())
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// {
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// DataContractSerializer ser = new DataContractSerializer(typeof(T));
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// ser.WriteObject(ms, obj);
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// ms.Seek(0, SeekOrigin.Begin);
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// retval = ser.ReadObject(ms);
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// ms.Close();
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// }
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// return (T) retval;
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//}
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// 表达式树实现
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// ....
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public static class TransExpV2<TIn, TOut>
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{
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private static readonly Func<TIn, TOut> cache = GetFunc();
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private static Func<TIn, TOut> GetFunc()
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{
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ParameterExpression parameterExpression = Expression.Parameter(typeof(TIn), "p");
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List<MemberBinding> memberBindingList = new List<MemberBinding>();
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foreach (var item in typeof(TOut).GetProperties())
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{
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if (!item.CanWrite)
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continue;
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MemberExpression property =
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Expression.Property(parameterExpression, typeof(TIn).GetProperty(item.Name));
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MemberBinding memberBinding = Expression.Bind(item, property);
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memberBindingList.Add(memberBinding);
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}
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MemberInitExpression memberInitExpression =
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Expression.MemberInit(Expression.New(typeof(TOut)), memberBindingList.ToArray());
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Expression<Func<TIn, TOut>> lambda = Expression.Lambda<Func<TIn, TOut>>(memberInitExpression,
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new ParameterExpression[] { parameterExpression });
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return lambda.Compile();
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}
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public static TOut Trans(TIn tIn)
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{
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return cache(tIn);
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}
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}
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}
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//public static class TransExpV2<TIn, TOut>
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//{
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// private static readonly Func<TIn, TOut> cache = GetFunc();
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// private static Func<TIn, TOut> GetFunc()
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// {
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// ParameterExpression parameterExpression = Expression.Parameter(typeof(TIn), "p");
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// List<MemberBinding> memberBindingList = new List<MemberBinding>();
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// foreach (var item in typeof(TOut).GetProperties())
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// {
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// if (!item.CanWrite) continue;
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// MemberExpression property = Expression.Property(parameterExpression, typeof(TIn).GetProperty(item.Name));
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// MemberBinding memberBinding = Expression.Bind(item, property);
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// memberBindingList.Add(memberBinding);
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// }
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// MemberInitExpression memberInitExpression = Expression.MemberInit(Expression.New(typeof(TOut)), memberBindingList.ToArray());
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// Expression<Func<TIn, TOut>> lambda = Expression.Lambda<Func<TIn, TOut>>(memberInitExpression, new ParameterExpression[] { parameterExpression });
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// return lambda.Compile();
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// }
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// public static TOut Trans(TIn tIn)
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// {
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// return cache(tIn);
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// }
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//}
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}
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