本文實例講述了C#定義簡單的反射工廠用法。分享給大家供大家參考。具體分析如下:
首先,定義一個水果抽象類,代碼如下:
class Fruit{ //定義虛方法 public virtual void Eating() { Console.WriteLine("水果有各種吃法。。。"); }}
然后,實例化幾個水果類,代碼如下:
class Banana : Fruit{ public override void Eating() { Console.WriteLine("香蕉扒皮吃。。。"); }}class Orange : Fruit{ public override void Eating() { Console.WriteLine("橘子剝皮吃。。。"); }}class Apple : Fruit{ public new void Eating() { Console.WriteLine("蘋果洗了吃。。。"); } //public override void Eating() //{ // Console.WriteLine("蘋果洗了吃。。。"); //}}
最后,創建水果工廠,代碼如下:
//水果工廠class FruitFactory{ //生成水果 public Fruit CreateFruit(string _fruitname) { //不使用反射的做法如下: //if ("Apple" == _fruitname) //{ // return new Apple(); //} //else if ("Banana" == _fruitname) //{ // return new Banana(); //} //else if ("Orange" == _fruitname) //{ // return new Orange(); //} //else //{ // throw new Exception("您指定的水果不生產!"); //} //獲得當前程序的命名空間 string strNamespace = Assembly.GetExecutingAssembly().GetName().Name; //調用方法一:使用 Type 類 //Type type = Type.GetType("ConsoleApplication1." + _fruitname); //ConstructorInfo ctorInfo = type.GetConstructor(System.Type.EmptyTypes); //// Invoke()方法:返回與構造函數關聯的類的實例。 //Fruit fruitA = (Fruit)ctorInfo.Invoke(new object[0]); //return fruitA; //調用方法二:使用 Assembly 類 //Assembly myAssembly = Assembly.GetExecutingAssembly(); //Fruit fruitB = (Fruit)myAssembly.CreateInstance("ConsoleApplication1." + _fruitname); //return fruitB; //調用方法三:使用 Activator 類 Fruit fruitC = (Fruit)Activator.CreateInstance(Type.GetType("ConsoleApplication1." + _fruitname, false, true)); return fruitC; }}
測試代碼如下:
class Program{ static void Main(string[] args) { FruitFactory ff = new FruitFactory(); //打?。▉碜愿割惖模核懈鞣N吃法。。。 Fruit fA = ff.CreateFruit("Apple"); fA.Eating(); //打?。▉碜宰宇惖模禾O果洗了吃。。。 Apple apple = ff.CreateFruit("Apple") as Apple; apple.Eating(); Fruit fB = ff.CreateFruit("Banana"); fB.Eating(); Fruit fC = ff.CreateFruit("Orange"); fC.Eating(); }}
利用反射創建實例對象的常用三種方式:
// 方式一:使用 Type 類Type type = Type.GetType("ConsoleApplication1." + _fruitname);ConstructorInfo ctorInfo = type.GetConstructor(System.Type.EmptyTypes);// Invoke()方法:返回與構造函數關聯的類的實例。Fruit fruitA = (Fruit)ctorInfo.Invoke(new object[0]);return fruitA;// 方式二:使用 Assembly 類Assembly myAssembly = Assembly.GetExecutingAssembly();Fruit fruitB = (Fruit)myAssembly.CreateInstance("ConsoleApplication1." + _fruitname);return fruitB;// 方式三:使用 Activator 類Fruit fruitC = (Fruit)Activator.CreateInstance(Type.GetType("ConsoleApplication1." + _fruitname, false, true));return fruitC;示例的全部代碼如下:using System;using System.Collections.Generic;using System.Text;using System.Reflection;//抽象類可以繼承抽象類namespace ConsoleApplication1{ class Fruit { //定義虛方法 public virtual void Eating() { Console.WriteLine("水果有各種吃法。。。"); } } //水果工廠 class FruitFactory { //生成水果 public Fruit CreateFruit(string _fruitname) { //不使用反射的做法如下: //if ("Apple" == _fruitname) //{ // return new Apple(); //} //else if ("Banana" == _fruitname) //{ // return new Banana(); //} //else if ("Orange" == _fruitname) //{ // return new Orange(); //} //else //{ // throw new Exception("您指定的水果不生產!"); //} //獲得當前程序的命名空間 string strNamespace = Assembly.GetExecutingAssembly().GetName().Name; //調用方法一:使用 Type 類 //Type type = Type.GetType("ConsoleApplication1." + _fruitname); //ConstructorInfo ctorInfo = type.GetConstructor(System.Type.EmptyTypes); //// Invoke()方法:返回與構造函數關聯的類的實例。 //Fruit fruitA = (Fruit)ctorInfo.Invoke(new object[0]); //return fruitA; //調用方法二:使用 Assembly 類 //Assembly myAssembly = Assembly.GetExecutingAssembly(); //Fruit fruitB = (Fruit)myAssembly.CreateInstance("ConsoleApplication1." + _fruitname); //return fruitB; //調用方法三:使用 Activator 類 Fruit fruitC = (Fruit)Activator.CreateInstance(Type.GetType("ConsoleApplication1." + _fruitname, false, true)); return fruitC; } } class Banana : Fruit { public override void Eating() { Console.WriteLine("香蕉扒皮吃。。。"); } } class Orange : Fruit { public override void Eating() { Console.WriteLine("橘子剝皮吃。。。"); } } class Apple : Fruit { public new void Eating() { Console.WriteLine("蘋果洗了吃。。。"); } //public override void Eating() //{ // Console.WriteLine("蘋果洗了吃。。。"); //} } class Program { static void Main(string[] args) { FruitFactory ff = new FruitFactory(); //打印(來自父類的):水果有各種吃法。。。 Fruit fA = ff.CreateFruit("Apple"); fA.Eating(); //打?。▉碜宰宇惖模禾O果洗了吃。。。 Apple apple = ff.CreateFruit("Apple") as Apple; apple.Eating(); Fruit fB = ff.CreateFruit("Banana"); fB.Eating(); Fruit fC = ff.CreateFruit("Orange"); fC.Eating(); } }}
希望本文所述對大家的C#程序設計有所幫助。
新聞熱點
疑難解答