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作者:terrylee 来源:博客园 2007年11月3日
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public abstract class LogWrapper : Log { private Log _log; public LogWrapper(Log log) { _log = log; } public override void Write(string log) { _log.Write(log); } } |
public class LogErrorWrapper : LogWrapper { public LogErrorWrapper(Log _log) :base(_log){} public override void Write(string log) { SetError(); //......功能扩展 base.Write(log); } public void SetError() { //......实现了记录错误严重级别 } } public class LogPriorityWrapper : LogWrapper { public LogPriorityWrapper(Log _log): base(_log){} public override void Write(string log) { SetPriority(); //......功能扩展 base.Write(log); } public void SetPriority() { //......实现了记录优先级别 } } |
public class Program { public static void Main(string[] args) { Log log = new DatabaseLog(); LogWrapper lew1 = new LogErrorWrapper(log); //扩展了记录错误严重级别 lew1.Write( "Log Message"); LogPriorityWrapper lpw1 = new LogPriorityWrapper(log); //扩展了记录优先级别 lpw1.Write( "Log Message"); LogWrapper lew2 = new LogErrorWrapper(log); LogPriorityWrapper lpw2 = new LogPriorityWrapper(lew2); //这里是lew2 //同时扩展了错误严重级别和优先级别 lpw2.Write( "Log Message"); } } |
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