基于反射解決類復制的實現方法

更新時間：2013年05月06日 18:27:03 作者：

本篇文章對反射解決類復制的實現方法進行了詳細的分析介紹。需要的朋友參考下

假定一個類，類名是EtyBase，另一個類類名是EtyTwo，EtyTwo繼承自EtyBase。現在要求EtyTwo的屬性值從一個EtyBase中復制過來傳統做法是

View Code

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;
}

這樣子做有幾點不好的地方

EtyBase的屬性改變時復制的屬性也得改變，耦合較高；
若EtyBase的屬性比較多，那么這個復制方法將顯得比較冗長，寫的人手累。

如果用反射來做，我是這么做的

復制代碼代碼如下:

View Code

public void CopyEty(EtyBase from, EtyBase to)
{
//利用反射獲得類成員
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;
    }
}
}

反射可以解決上述的兩個缺點，當類屬性改變或增加時，此復制方法無需改變。當然這是要付出些許運行效率的。

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