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在把一个对象赋值给另外一个同类型的对象时，意味着两个对象的堆栈信息是一样的。当你想把对象的某一个属性更改后再添加到一个列表的时候，就会被最后的对象替换掉，就不能实现新对象的添加。下面两种方式可以实现对象赋值给同类型的对象，这两个对象的堆栈信息是不一样的。
方法一：
必须对对象进行序列化处理
public static object DeepClone(object obj){BinaryFormatter bFormatter = new BinaryFormatter();MemoryStream stream = new MemoryStream();bFormatter.Serialize(stream, obj);stream.Seek(0, SeekOrigin.Begin);return bFormatter.Deserialize(stream);}测试：
[Serializable]
class User
{public User(){}public int id;public string name;public User(int id, string name){this.id = id;this.name = name;}
}public class test : MonoBehaviour {List<User> users;User user;// Use this for initializationvoid Start () {users = new List<User>();user = new User(2,"小花");}int b = 5;private void Update(){if (Input.GetKeyDown(KeyCode.Q)){var a = new User();a = GameTool.DeepClone(user) as User;a.id = b++;users.Add(a);}}
}
方法二：
public static object CopyObject(object obj){object targetDeepCopyObj;if (obj == null){Debug.Log("copy obj is null");}var targetType = obj.GetType();//值类型 if (targetType.IsValueType == true){targetDeepCopyObj = obj;}//引用类型 else{targetDeepCopyObj = Activator.CreateInstance(targetType); //创建引用对象 MemberInfo[] memberCollection = obj.GetType().GetMembers();foreach (MemberInfo member in memberCollection){if (member.MemberType == MemberTypes.Field){FieldInfo field = (FieldInfo)member;object fieldValue = field.GetValue(obj);if (fieldValue is ICloneable){field.SetValue(targetDeepCopyObj, (fieldValue as ICloneable).Clone());}else{field.SetValue(targetDeepCopyObj, CopyObject(fieldValue));}}else if (member.MemberType == MemberTypes.Property){PropertyInfo myProperty = (PropertyInfo)member;MethodInfo info = myProperty.GetSetMethod(false);if (info != null){object propertyValue = myProperty.GetValue(obj, null);if (propertyValue is ICloneable){myProperty.SetValue(targetDeepCopyObj, (propertyValue as ICloneable).Clone(), null);}else{myProperty.SetValue(targetDeepCopyObj, CopyObject(propertyValue), null);}}}}}return targetDeepCopyObj;}public static void CopyObject(object source, object target){var targetType = target.GetType();if (targetType == null){targetType = source.GetType();}//值类型 if (targetType.IsValueType == true){target = source;}//引用类型 else{if (source == null){return;}MemberInfo[] memberCollection = source.GetType().GetMembers();foreach (MemberInfo member in memberCollection){if (member.MemberType == MemberTypes.Field){FieldInfo field = (FieldInfo)member;object fieldValue = field.GetValue(source);if (fieldValue is ICloneable){field.SetValue(target, (fieldValue as ICloneable).Clone());}else{field.SetValue(target, CopyObject(fieldValue));}}else if (member.MemberType == MemberTypes.Property){PropertyInfo myProperty = (PropertyInfo)member;MethodInfo info = myProperty.GetSetMethod(false);if (info != null){object propertyValue = myProperty.GetValue(source, null);if (propertyValue is ICloneable){myProperty.SetValue(target, (propertyValue as ICloneable).Clone(), null);}else{myProperty.SetValue(target, CopyObject(propertyValue), null);}}}}}}测试：
class User
{public User(){}public int id;public string name;public User(int id, string name){this.id = id;this.name = name;}
}public class test : MonoBehaviour {List<User> users;User user;// Use this for initializationvoid Start () {users = new List<User>();user = new User(2,"小花");}int b = 5;private void Update(){if (Input.GetKeyDown(KeyCode.Q)){var a = new User();a = GameTool.CopyObject(user) as User;a.id = b++;users.Add(a);}}
}
测试结果keyu可以断点查看users数据
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