Add Design Patterns

VisitorLib/Circle.cs

@@ -0,0 +1,10 @@
+namespace VisitorLib;
+
+public class Circle: Shape
+{
+    public int Radius { get; set; }
+    public override void Accept(IShapeVisitor visitor)
+    {
+        visitor.VisitCircle(this);
+    }
+}

VisitorLib/IShapeVisitor.cs

@@ -0,0 +1,7 @@
+namespace VisitorLib;
+
+public interface IShapeVisitor
+{
+    void VisitRectangle(Rectangle rectangle);
+    void VisitCircle(Circle rectangle);
+}

VisitorLib/Rectangle.cs

@@ -0,0 +1,10 @@
+namespace VisitorLib;
+
+public class Rectangle: Shape
+{
+    public int Area { get; set; }
+    public override void Accept(IShapeVisitor visitor)
+    {
+        visitor.VisitRectangle(this);
+    }
+}

VisitorLib/Shape.cs

@@ -0,0 +1,6 @@
+namespace VisitorLib;
+
+public abstract class Shape
+{
+    public abstract void Accept(IShapeVisitor visitor);
+}

VisitorLib/VisitorLib.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>net10.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+        <RootNamespace>VisitorLib</RootNamespace>
+    </PropertyGroup>
+
+</Project>