如何用C#實現開閉原則？

像類別、模組和函數這樣的軟體實體應該對擴充功能開放，但對修改關閉。

定義 - 開放關閉原則指出程式碼的設計和編寫應該以這樣的方式完成：在現有程式碼中進行最少的變更來新增功能。設計的方式應該允許添加新功能作為新類別，並儘可能保持現有程式碼不變。

範例

打開關閉之前的程式碼原理

using System;
using System.Net.Mail;
namespace SolidPrinciples.Open.Closed.Principle.Before{
   public class Rectangle{
      public int Width { get; set; }
      public int Height { get; set; }
   }
   public class CombinedAreaCalculator{
      public double Area (object[] shapes){
         double area = 0;
         foreach (var shape in shapes){
            if(shape is Rectangle){
               Rectangle rectangle = (Rectangle)shape;
               area += rectangle.Width * rectangle.Height;
            }
         }
         return area;
      }
   }
   public class Circle{
      public double Radius { get; set; }
   }
   public class CombinedAreaCalculatorChange{
      public double Area(object[] shapes){
         double area = 0;
         foreach (var shape in shapes){
            if (shape is Rectangle){
               Rectangle rectangle = (Rectangle)shape;
               area += rectangle.Width * rectangle.Height;
            }
            if (shape is Circle){
               Circle circle = (Circle)shape;
               area += (circle.Radius * circle.Radius) * Math.PI;
            }
         }
         return area;
      }
   }
}

OpenClosed原則之後的程式碼

namespace SolidPrinciples.Open.Closed.Principle.After{
   public abstract class Shape{
      public abstract double Area();
   }
   public class Rectangle: Shape{
      public int Width { get; set; }
      public int Height { get; set; }
      public override double Area(){
         return Width * Height;
      }
   }
   public class Circle : Shape{
      public double Radius { get; set; }
      public override double Area(){
         return Radius * Radius * Math.PI;
      }
   }
   public class CombinedAreaCalculator{
      public double Area (Shape[] shapes){
         double area = 0;
         foreach (var shape in shapes){
            area += shape.Area();
         }
         return area;
      }
   }
}

#

以上是如何用C#實現開閉原則？的詳細內容。更多資訊請關注PHP中文網其他相關文章！