假定一个类，类名是EtyBase，另一个类类名是EtyTwo，EtyTwo继承自EtyBase。现在要求EtyTwo的属性值从一个EtyBase中复制过来传统做法是
public void CopyEty(EtyBase from, EtyBase to)
{
to.AccStatus = from.AccStatus;
to.Alarm = from.Alarm;
to.AlarmType = from.AlarmType;
to.CarNum = from.CarNum;
to.DevNum = from.DevNum;
to.DeviceNum = from.DeviceNum;
to.Direct = from.Direct;
to.DriveCode = from.DriveCode;
to.GpsData = from.GpsData;
to.GpsEnvent = from.GpsEnvent;
to.GpsOdo = from.GpsOdo;
to.GpsSpeed = from.GpsSpeed;
to.GpsStatus = from.GpsStatus;
to.GpsrevTime = from.GpsrevTime;
to.Gsmci = from.Gsmci;
to.Gsmci1 = from.Gsmci1;
to.Gsmloc = from.Gsmloc;
to.Gsmloc1 = from.Gsmloc1;
to.IsEffective = from.IsEffective;
to.IsJump = from.IsJump;
to.IsReply = from.IsReply;
to.Latitude = from.Latitude;
to.LaunchStatus = from.LaunchStatus;
to.Longitude = from.Longitude;
to.MsgContent = from.MsgContent;
to.MsgExId = from.MsgExId;
to.MsgId = from.MsgId;
to.MsgLength = from.MsgLength;
to.MsgType = from.MsgType;
to.NowOverArea = from.NowOverArea;
to.NowStatus = from.NowStatus;
to.Oil = from.Oil;
to.PulseCount = from.PulseCount;
to.PulseOdo = from.PulseOdo;
to.PulseSpeed = from.PulseSpeed;
to.ReplyContent = from.ReplyContent;
to.RevMsg = from.RevMsg;
to.Speed = from.Speed;
to.Status = from.Status;
to.Temperture = from.Temperture;
to.UserName = from.UserName;
}
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这样子做有几点不好的地方
EtyBase的属性改变时复制的属性也得改变，耦合较高；
若EtyBase的属性比较多，那么这个复制方法将显得比较冗长，写的人手累。
如果用反射来做，我是这么做的
public void CopyEty(EtyBase from, EtyBase to)
{
//利用反射获得类成员
FieldInfo[] fieldFroms = from.GetType().GetFields();
FieldInfo[] fieldTos = to.GetType().GetFields();
int lenTo = fieldTos.Length;
for (int i = 0, l = fieldFroms.Length; i < l; i++)
{
for (int j = 0; j < lenTo; j++)
{
if (fieldTos[j].Name != fieldFroms[i].Name) continue;
fieldTos[j].SetValue(to, fieldFroms[i].GetValue(from));
break;
}
}
}
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反射可以解决上述的两个缺点，当类属性改变或增加时，此复制方法无需改变。当然这是要付出些许运行效率的。