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ÔÚÈí¼þ¿ª·¢ÖУ¬¾­³£»áÓöµ½¶¯Ì¬µØÎªÒ»¸ö¶ÔÏó¶ø²»ÊÇÕû¸öÀàÔö¼ÓһЩ¹¦ÄܵÄÎÊÌ⣬»¹ÊÇÒÔÎÒ¹ßÓõļǼÈÕÖ¾µÄÀý×ÓÀ´ËµÃ÷°É£¨Ò²ÐíÔÚDecoratorģʽÀïÃæÓÃÕâ¸öÀý×Ó²»ÊÇÌØ±ðºÏÊÊ£©¡£ÏÖÔÚÒªÇóÎÒÃÇ¿ª·¢µÄ¼Ç¼ÈÕÖ¾µÄ×é¼þ£¬³ýÁËÒªÖ§³ÖÊý¾Ý¿â¼Ç¼DatabaseLogºÍÎı¾Îļþ¼Ç¼TextFileLogÁ½ÖÖ·½Ê½Í⣬ÎÒÃÇ»¹ÐèÒªÔÚ²»Í¬µÄÓ¦Óû·¾³ÖÐÔö¼ÓһЩ¶îÍâµÄ¹¦ÄÜ£¬±ÈÈçÐèÒª¼Ç¼ÈÕÖ¾ÐÅÏ¢µÄ´íÎóÑÏÖØ¼¶±ð£¬ÐèÒª¼Ç¼ÈÕÖ¾ÐÅÏ¢µÄÓÅÏȼ¶±ð£¬»¹ÓÐÈÕÖ¾ÐÅÏ¢µÄÀ©Õ¹ÊôÐԵȹ¦ÄÜ¡£ÔÚÕâÀÈç¹ûÎÒÃDz»È¥¿¼ÂÇÉè¼ÆÄ£Ê½£¬½â¾öÎÊÌâµÄ·½·¨ÆäʵºÜ¼òµ¥£¬¿ÉÒÔͨ¹ý¼Ì³Ð»úÖÆÈ¥ÊµÏÖ£¬ÈÕÖ¾Àà½á¹¹Í¼ÈçÏ£º

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public abstract class Log

{

    public abstract void Write(string log);

}

public class DatabaseLog : Log

{

    public override void Write(string log)

    {

        //......¼Ç¼µ½Êý¾Ý¿âÖÐ

    }

}

public class TextFileLog : Log

{

    public override void Write(string log)

    {

        //......¼Ç¼µ½Îı¾ÎļþÖÐ

    }

}

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public interface IError

{

    void SetError();

}

public interface IPriority

{

    void SetPriority();

}

public class DBErrorLog : DatabaseLog, IError

{

    public override void Write(string log)

    {

        base.Write(log);

    }

    public void SetError()

    {

       //......¹¦ÄÜÀ©Õ¹£¬ÊµÏÖÁ˼Ǽ´íÎóÑÏÖØ¼¶±ð

    }

}

public class DBPriorityLog : DatabaseLog, IPriority

{

    public override void Write(string log)

    {

        base.Write(log);

    }

    public void SetPriority()

    {

        //......¹¦ÄÜÀ©Õ¹£¬ÊµÏÖÁ˼ǼÓÅÏȼ¶±ð

    }

}

public class TFErrorLog : TextFileLog, IError

{

    public override void Write(string log)

    {

        base.Write(log);

    }

    public void SetError()

    {

        //......¹¦ÄÜÀ©Õ¹£¬ÊµÏÖÁ˼Ǽ´íÎóÑÏÖØ¼¶±ð

    }

}

public class TFPriorityLog : TextFileLog, IPriority

{

    public override void Write(string log)

    {

        base.Write(log);

    }

    public void SetPriority()

    {

        //......¹¦ÄÜÀ©Õ¹£¬ÊµÏÖÁ˼ǼÓÅÏȼ¶±ð

    }

}

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public class DBEPLog : DatabaseLog, IError, IPriority

{

    public override void Write(string log)

    {

        SetError();

        SetPriority();

        base.Write(log);

    }

    public void SetError()

    {

        //......¹¦ÄÜÀ©Õ¹£¬ÊµÏÖÁ˼Ǽ´íÎóÑÏÖØ¼¶±ð

    }

    public void SetPriority()

    {

        //......¹¦ÄÜÀ©Õ¹£¬ÊµÏÖÁ˼ǼÓÅÏȼ¶±ð

    }

}

public class TFEPLog : DatabaseLog, IError, IPriority

{

    public override void Write(string log)

    {

        SetError();

        SetPriority();

base.Write(log);

    }

    public void SetError()

    {

        //......¹¦ÄÜÀ©Õ¹£¬ÊµÏÖÁ˼Ǽ´íÎóÑÏÖØ¼¶±ð

    }

    public void SetPriority()

    {

        //......¹¦ÄÜÀ©Õ¹£¬ÊµÏÖÁ˼ǼÓÅÏȼ¶±ð

    }

}

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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);

    }

}

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public class LogErrorWrapper : LogWrapper

{

    public LogErrorWrapper(Log _log)

        :base(_log)

    {

       

    }

    public override void Write(string log)

    {

        SetError(); //......¹¦ÄÜÀ©Õ¹

 

        base.Write(log);

    }

    public void SetError()

    {

        //......ʵÏÖÁ˼Ǽ´íÎóÑÏÖØ¼¶±ð

    }

}

public class LogPriorityWrapper : LogWrapper

{

    public LogPriorityWrapper(Log _log)

        : base(_log)

    {

 

    }

    public override void Write(string log)

    {

        SetPriority(); //......¹¦ÄÜÀ©Õ¹

 

        base.Write(log);

    }

    public void SetPriority()

    {

        //......ʵÏÖÁ˼ǼÓÅÏȼ¶±ð

    }

}

µ½ÕâÀLogErrorWrapperÀàºÍLogPriorityWrapperÀàÕæÕýʵÏÖÁ˶ԴíÎóÑÏÖØ¼¶±ðºÍÓÅÏȼ¶±ðµÄ¹¦ÄܵÄÀ©Õ¹¡£ÎÒÃÇÀ´¿´Ò»Ï¿ͻ§³ÌÐòÈçºÎÈ¥µ÷ÓÃËü£º

public class Program

{

    public static void Main(string[] args)

    {

        Log log = new DatabaseLog();

        LogWrapper lew1 = new LogErrorWrapper(log);

        //À©Õ¹Á˼Ǽ´íÎóÑÏÖØ¼¶±ð

        lew1.Write("Log Message");

 

        LogPriorityWrapper lpw1 = new LogPriorityWrapper(log);

        //À©Õ¹Á˼ǼÓÅÏȼ¶±ð

        lpw1.Write("Log Message");

 

        LogWrapper lew2 = new LogErrorWrapper(log);

        LogPriorityWrapper lpw2 = new LogPriorityWrapper(lew2); //ÕâÀïÊÇlew2

        //ͬʱÀ©Õ¹ÁË´íÎóÑÏÖØ¼¶±ðºÍÓÅÏȼ¶±ð

        lpw2.Write("Log Message");

    }

}

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1£®.NETÖÐDecoratorģʽһ¸öµäÐ͵ÄÔËÓþÍÊǹØÓÚStream£¬Ëü´æÔÚ×ÅÈçϵÄÀà½á¹¹£º

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class Program

{

    public static void Main(string[] args)

    {

        MemoryStream ms =

            new MemoryStream(new byte[] { 100,456,864,222,567});

 

        //À©Õ¹ÁË»º³åµÄ¹¦ÄÜ

        BufferedStream buff = new BufferedStream(ms);

 

        //À©Õ¹ÁË»º³å£¬¼ÓÃܵŦÄÜ

        CryptoStream crypto = new CryptoStream(buff);

    }

}

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public sealed class BufferedStream : Stream

{

    // Methods

    private BufferedStream();

    public BufferedStream(Stream stream);

    public BufferedStream(Stream stream, int bufferSize);

    // Fields

    private int _bufferSize;

    private Stream _s;

}

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public abstract class DBCommandWrapper : MarshalByRefObject, IDisposable

{

 

}

public class SqlCommandWrapper : DBCommandWrapper

{

   

}

public class OracleCommandWrapper : DBCommandWrapper

{

 

}

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