public static T DeepCloneObject<T>(T obj) where T : class { //System.String类型似乎比较特殊,复制它的所有字段,并不能复制它本身 //不过由于System.String的不可变性,即使指向同一对象,也无所谓 //而且.NET里本来就用字符串池来维持 if (obj == null || obj.GetType() == typeof(string)) return obj; object newObj = null; try { //尝试调用默认构造函数 newObj = Activator.CreateInstance(obj.GetType()); } catch { //失败的话,只好枚举构造函数了 foreach (ConstructorInfo ci in obj.GetType().GetConstructors(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic)) { try { ParameterInfo[] pis = ci.GetParameters(); object[] objs = new object[pis.Length]; for (int i = 0; i < pis.Length; i++) { if (pis[i].ParameterType.IsValueType) objs[i] = Activator.CreateInstance(pis[i].ParameterType); else //参数类型可能是抽象类或接口,难以实例化 //我能想到的就是枚举应用程序域里的程序集,找到实现了该抽象类或接口的类 //但显然过于复杂了 objs[i] = null; } newObj = ci.Invoke(objs); //无论调用哪个构造函数,只要成功就行了 break; } catch { } } } foreach (FieldInfo fi in obj.GetType().GetFields(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance)) { if (fi.FieldType.IsValueType || fi.FieldType == typeof(string)) fi.SetValue(newObj, fi.GetValue(obj)); else fi.SetValue(newObj, DeepCloneObject(fi.GetValue(obj))); } //基类的私有实例字段在子类里检索不到,但它仍占据子类对象的内存空间 Deep(newObj, obj); return (T)newObj; } //克隆继承树上的私有实例字段 public static void Deep(object newObj, object obj) { for (Type father = newObj.GetType().BaseType; father != typeof(object); father = father.BaseType) { foreach (FieldInfo fi in father.GetFields(BindingFlags.NonPublic | BindingFlags.Instance)) { //只需要处理私有字段,因为非私有成员已经在子类处理过了 if (fi.IsPrivate) { if (fi.FieldType.IsValueType || fi.FieldType == typeof(string)) { fi.SetValue(newObj, fi.GetValue(obj)); } else { fi.SetValue(newObj, DeepCloneObject(fi.GetValue(obj))); } } } } }