State

最新推荐文章于 2024-06-27 08:49:26 发布

原创最新推荐文章于 2024-06-27 08:49:26 发布 · 238 阅读

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#class #constructor #string #user #c

本文通过一个切换状态的例子介绍了状态模式的实现方法。该模式利用抽象基类定义了一个接口，并由具体的状态类来实现这个接口，从而使得对象可以在不同的行为之间切换。

using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace State { class Program { static void Main(string[] args) { // Setup context in a state Context c = new Context(new ConcreteStateA()); // Issue requests, which toggles state c.Request(); c.Request(); c.Request(); c.Request(); // Wait for user Console.ReadKey(); } } /// <summary> /// The 'State' abstract class /// </summary> abstract class State { public abstract void Handle(Context context); } /// <summary> /// A 'ConcreteState' class /// </summary> class ConcreteStateA : State { public override void Handle(Context context) { context.State = new ConcreteStateB(); } } /// <summary> /// A 'ConcreteState' class /// </summary> class ConcreteStateB : State { public override void Handle(Context context) { context.State = new ConcreteStateA(); } } /// <summary> /// The 'Context' class /// </summary> class Context { private State _state; // Constructor public Context(State state) { this.State = state; } // Gets or sets the state public State State { get { return _state; } set { _state = value; Console.WriteLine("State: " + _state.GetType().Name); } } public void Request() { _state.Handle(this); } } }