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; using System.Xml.Serialization; namespace CommonSD { 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 readonly 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) { if (type.FullName != null) { Type elementType = Type.GetType(type.FullName.Replace("[]", string.Empty)); var array = obj as Array; if (array != null) { Array copied = Array.CreateInstance(elementType ?? throw new InvalidOperationException(), 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) { if (type.FullName != null) { Type elementType = Type.GetType(type.FullName.Replace("[]", string.Empty)); var array = obj as Array; if (array != null) { Array copied = Array.CreateInstance(elementType ?? throw new InvalidOperationException(), 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 == 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（亲测有用） 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); } } } }