访问者模式

XINCGer · XINCGer · commit 1e24faffd4eb · 2017-08-30T20:50:23.000+08:00
diff --git a/DesignPatterns/VisitorPattern/VisitorPattern/ObjectStructure.cs b/DesignPatterns/VisitorPattern/VisitorPattern/ObjectStructure.cs
@@ -0,0 +1,34 @@
+&#65279;using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace VisitorPattern
+{
+    /// <summary>
+    /// &#32467;&#26500;&#23545;&#35937;&#31867;&#65292;&#32467;&#26500;&#23545;&#35937;&#21487;&#20197;&#35748;&#20026;&#26159;&#19968;&#20010;&#23545;&#35775;&#38382;&#36827;&#34892;&#25511;&#21046;&#30340;&#31649;&#29702;&#32773;
+    /// </summary>
+    class ObjectStructure
+    {
+        private List<Element> elements = new List<Element>();
+
+        public void Attach(Element element)
+        {
+            elements.Add(element);
+        }
+
+        public void Detch(Element element)
+        {
+            elements.Remove(element);
+        }
+
+        public void Accept(Visitor visitor)
+        {
+            foreach (var element in elements)
+            {
+                element.Accept(visitor);
+            }
+        }
+    }
+}
diff --git a/DesignPatterns/VisitorPattern/VisitorPattern/Program.cs b/DesignPatterns/VisitorPattern/VisitorPattern/Program.cs
@@ -10,6 +10,12 @@ class Program
     {
         static void Main(string[] args)
         {
+
+            ObjectStructure obj = new ObjectStructure();
+            obj.Attach(new ConcreteElementA());
+            obj.Attach(new ConcreteElementB());
+            ConcreteVisitor visitor = new ConcreteVisitor();
+            obj.Accept(visitor);
         }
     }
 }
diff --git a/DesignPatterns/VisitorPattern/VisitorPattern/Visitor.cs b/DesignPatterns/VisitorPattern/VisitorPattern/Visitor.cs
@@ -14,4 +14,17 @@ abstract class Visitor
         public abstract void VisitConcreteElementA(ConcreteElementA element);
         public abstract void VisitConcreteElementB(ConcreteElementB element);
     }
+
+    class ConcreteVisitor : Visitor
+    {
+        public override void VisitConcreteElementA(ConcreteElementA element)
+        {
+            Console.WriteLine("&#20803;&#32032;A&#34987;&#35775;&#38382;&#32773;&#35775;&#38382;");
+        }
+
+        public override void VisitConcreteElementB(ConcreteElementB element)
+        {
+            Console.WriteLine("&#20803;&#32032;B&#34987;&#35775;&#38382;&#32773;&#35775;&#38382;");
+        }
+    }
 }
diff --git a/DesignPatterns/VisitorPattern/VisitorPattern/VisitorPattern.csproj b/DesignPatterns/VisitorPattern/VisitorPattern/VisitorPattern.csproj
@@ -43,6 +43,7 @@
   </ItemGroup>
   <ItemGroup>
     <Compile Include="Element.cs" />
+    <Compile Include="ObjectStructure.cs" />
     <Compile Include="Program.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="Visitor.cs" />

Original file line number	Diff line number	Diff line change
`@@ -10,6 +10,12 @@ class Program`
`10`	`10`	`{`
`11`	`11`	`static void Main(string[] args)`
`12`	`12`	`{`
	`13`	`+`
	`14`	`+ ObjectStructure obj = new ObjectStructure();`
	`15`	`+ obj.Attach(new ConcreteElementA());`
	`16`	`+ obj.Attach(new ConcreteElementB());`
	`17`	`+ ConcreteVisitor visitor = new ConcreteVisitor();`
	`18`	`+ obj.Accept(visitor);`
`13`	`19`	`}`
`14`	`20`	`}`
`15`	`21`	`}`