ISimpleWriter
1using System; 2using System.Collections.Generic; 3using System.Text; 4 5namespace Gof.Nan.Test.Decorator 6{ 7 public interface ISimpleWriter 8 { 9 void Write(char c);10 void Write(string s);11 void WriteLine();12 void Close();13 }14}
SimpleStreamWriter
1using System; 2using System.Collections.Generic; 3using System.Text; 4using System.IO; 5 6namespace Gof.Nan.Test.Decorator 7{ 8 public class SimpleStreamWriter : StreamWriter,ISimpleWriter 9 {10 public SimpleStreamWriter(Stream s)11 : base(s)12 { 13 }1415 public SimpleStreamWriter(string path)16 : base(path)17 {18 }19 }20}
OozinozFilter
1using System; 2using System.Collections.Generic; 3using System.Text; 4 5namespace Gof.Nan.Test.Decorator 6{ 7 public abstract class OozinozFilter : ISimpleWriter 8 { 9 protected ISimpleWriter _writer;1011 public OozinozFilter(ISimpleWriter w)12 {13 _writer = w;14 }1516 ISimpleWriter 成员#region ISimpleWriter 成员1718 public abstract void Write(char c);1920 public virtual void Write(string s)21 {22 foreach (char c in s.ToCharArray())23 {24 Write(c);25 }26 }2728 public virtual void WriteLine()29 {30 _writer.WriteLine();31 }3233 public void Close()34 {35 _writer.Close();36 }3738 #endregion39 }40}
LowerCaseFilter
1using System; 2using System.Collections.Generic; 3using System.Text; 4 5namespace Gof.Nan.Test.Decorator 6{ 7 public class LowerCaseFilter : OozinozFilter 8 { 9 public LowerCaseFilter(ISimpleWriter w)10 : base(w)11 {12 }1314 public override void Write(char c)15 {16 _writer.Write(char.ToLower(c));17 }18 }19}20
客户代码
1using System; 2using System.Collections.Generic; 3using System.Text; 4 5namespace Gof.Nan.Test.Decorator 6{ 7 public class ShowLowerCase 8 { 9 static void Main(string[] args)10 {11 ISimpleWriter w = new SimpleStreamWriter("sample.txt");12 ISimpleWriter x = new LowerCaseFilter(w);13 x.Write("This Text,notably ALL in LoweR CasE!");14 x.Close();15 }16 }17}
类图：
The Decorator Pattern attaches additional responsibilities to an object dynamically. Decorators provide a flexible alternative to subclassing for extending functionality.
转载于:https://www.cnblogs.com/nanshouyong326/archive/2007/01/15/620897.html
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