C# 依賴注入那些事兒

原文地址：http://www.cnblogs.com/leoo2sk/archive/2009/06/17/1504693.html

?

里面有一個例子差了些代碼，補全后貼上。

3.1.3 依賴獲取

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml;//定義了三個接口 IWindow IButton ITextBox
namespace DependencyLocate
{internal interface IWindow{String ShowInfo();}internal interface IButton{String ShowInfo();}internal interface ITextBox{String ShowInfo();}
}//實現接口 IWindow， 實現類 WindowsWindow、MacWindow
namespace DependencyLocate
{internal sealed class WindowsWindow : IWindow{public String Description { get; private set; }public WindowsWindow(){this.Description = "Windows風格窗體";}public String ShowInfo(){return this.Description;}}internal sealed class MacWindow : IWindow{public String Description { get; private set; }public MacWindow(){this.Description = " Mac風格窗體";}public String ShowInfo(){return this.Description;}}
}//實現接口 IButton， 實現類 WindowsButton、MacButton
namespace DependencyLocate
{internal sealed class WindowsButton : IButton{public String Description { get; private set; }public WindowsButton(){this.Description = "Windows風格按鈕";}public String ShowInfo(){return this.Description;}}internal sealed class MacButton : IButton{public String Description { get; private set; }public MacButton(){this.Description = " Mac風格按鈕";}public String ShowInfo(){return this.Description;}}
}//實現接口 ITextBox， 實現類 WindowsTextBox、MacTextBox
namespace DependencyLocate
{internal sealed class WindowsTextBox : ITextBox{public String Description { get; private set; }public WindowsTextBox(){this.Description = "Windows風格文本框";}public String ShowInfo(){return this.Description;}}internal sealed class MacTextBox : ITextBox{public String Description { get; private set; }public MacTextBox(){this.Description = " Mac風格文本框";}public String ShowInfo(){return this.Description;}}
}namespace DependencyLocate
{internal interface IFactory{IWindow MakeWindow();IButton MakeButton();ITextBox MakeTextBox();}
}namespace DependencyLocate
{internal sealed class WindowsFactory : IFactory{public IWindow MakeWindow(){return new WindowsWindow();}public IButton MakeButton(){return new WindowsButton();}public ITextBox MakeTextBox(){return new WindowsTextBox();}}
}namespace DependencyLocate
{internal sealed class MacFactory : IFactory{public IWindow MakeWindow(){return new MacWindow();}public IButton MakeButton(){return new MacButton();}public ITextBox MakeTextBox(){return new MacTextBox();}}
}namespace DependencyLocate
{internal static class FactoryContainer{public static IFactory factory { get; private set; }/// <summary>/// 靜態構造函數：///     是一個特殊的函數，將在其他所有方法執行之前以及變量或屬性被第一次訪問之前執行。///     這個構造函數是屬于類的，而不是屬于哪里實例的，就是說這個構造函數只會被執行一次。///     也就是在創建第一個實例或引用任何靜態成員之前，由.NET自動調用。///     可以使用該函數來初始化靜態變量，不應該使用實例構造函數初始化靜態變量。/// 地址：https://www.cnblogs.com/aimi/p/5499711.html/// </summary>static FactoryContainer(){XmlDocument xmlDoc = new XmlDocument();xmlDoc.Load("Config.xml");XmlNode xmlNode = xmlDoc.ChildNodes[1].ChildNodes[0].ChildNodes[0];if ("Windows" == xmlNode.Value){factory = new WindowsFactory();}else if ("Mac" == xmlNode.Value){factory = new MacFactory();}else{throw new Exception("Factory Init Error");}}}
}namespace DependencyLocate
{class Program{static void Main(string[] args){IFactory factory = FactoryContainer.factory;IWindow window = factory.MakeWindow();Console.WriteLine("創建 " + window.ShowInfo());IButton button = factory.MakeButton();Console.WriteLine("創建 " + button.ShowInfo());ITextBox textBox = factory.MakeTextBox();Console.WriteLine("創建 " + textBox.ShowInfo());Console.ReadLine();}}
}

?