C#之—委托
2024-08-29 06:15:36
（1）定义委托：（百度百科样例，只有写了才有收获）
namespace Entrust
{
public delegate void GreetingDelegate(string name); //定义委托
class Class1
{
public void EnglishGreeting(string name)
{
Console.WriteLine("Good Morning." + name);
} public void ChineseGreeting(string name)
{
Console.WriteLine("早上好." +name);
} public void GreetPeople(string name, GreetingDelegate MakeGreeting)
{
MakeGreeting(name);
}
}
}
测试类：
namespace Entrust
{
class TestMain
{
static void Main(string[] args)
{
Class1 c = new Class1(); //c.GreetPeople("San Zhang",c.EnglishGreeting);
//c.GreetPeople("张三", c.ChineseGreeting); //Console.WriteLine("委托变量！");
//GreetingDelegate delegate1 = c.EnglishGreeting;
//GreetingDelegate delegate2 = c.ChineseGreeting;
//c.GreetPeople("张三", delegate2);
//c.GreetPeople("San Zhang", delegate1); //Console.WriteLine("多个方法绑定同一个委托！");
//GreetingDelegate delegate1;
//delegate1 = c.EnglishGreeting;
//delegate1 += c.ChineseGreeting;
//c.GreetPeople("李四",delegate1); //Console.WriteLine("直接调用委托！");
//GreetingDelegate delegate1;
//delegate1 = c.EnglishGreeting;
//delegate1 += c.ChineseGreeting;
//delegate1("小张"); //GreetingDelegate delegate1 = new GreetingDelegate(c.EnglishGreeting);
//delegate1 += c.ChineseGreeting;
//delegate1("小李"); GreetingDelegate delegate1 = c.EnglishGreeting;
delegate1 += c.ChineseGreeting; //绑定委托
delegate1 -= c.EnglishGreeting; //解除委托
delegate1("小张");
}
}
}
（2）定义委托事件（封装属性和方法）
namespace Entrust
{
public delegate void GreetingDelegate1(string name); class GreetingManage
{
public event GreetingDelegate1 MakeGreet;//这里声明一个事件 public GreetingDelegate1 delegate1;
public void GreetPeople(string name)
{
//if (delegate1 != null)
// delegate1(name);
MakeGreet(name);
}
}
}
执行的方法类
namespace Entrust
{
class GreetingLanguage
{
public void EnglishGreeting(string name)
{
Console.WriteLine("Morning, " + name);
} public void ChineseGreeting(string name)
{
Console.WriteLine("早上好, " + name);
}
}
}
测试类：
namespace Entrust
{
class TestMain
{
static void Main(string[] args)
{
GreetingLanguage gl = new GreetingLanguage();
GreetingManage gm = new GreetingManage();
//gm.delegate1 = gl.EnglishGreeting;
gm.MakeGreet += gl.ChineseGreeting;
gm.GreetPeople("小张");
Console.ReadKey();
}
}
}
（3）委托弥补观察者模式的不足（若观察者不存在）详见（设计模式之—观察者模式）
通知者接口类（Subject）
namespace Observer_Pattern.CLASS
{
interface Subject
{
void Notify(); //通知
string SubjectState
{
get;
set;
}
}
}
秘书类（secreter）实现通知者接口
namespace Observer_Pattern.CLASS
{
public delegate void EventHandler(); //声明一个委托
class Secretary:Subject
{
public event EventHandler Update; //声明一事件Update，类型为委托EventHandler
private string action; /// <summary>
/// 通知
/// </summary>
public void Notify()
{
Update();
} public string SubjectState
{
get { return action; }
set { action = value; }
}
}
}
炒股工作者（stockWorker）
namespace Observer_Pattern.CLASS
{
class StockObserver
{
private string name;
private Subject sub;
public StockObserver(string name, Subject sub)
{
this.name = name;
this.sub = sub;
}
public void StockUpdate()
{
Console.WriteLine("{0} ，{1} 关闭股票软件，继续工作！",sub.SubjectState,name);
}
}
}
看NBA工作者（NBAWorker）
namespace Observer_Pattern.CLASS
{
class NBAObserver
{
private string name;
private Subject sub;
public NBAObserver(string name, Subject sub)
{
this.name = name;
this.sub = sub;
} public void NBAUpdate()
{
Console.WriteLine("{0} ，{1} 关闭NBA视频，继续工作！",sub.SubjectState,name);
}
}
}
测试类（TestMain）
namespace ObserverPattern_Entrust_
{
class TestMain
{
static void Main(string[] args)
{
Secretary mishu = new Secretary();
StockObserver worker1 = new StockObserver("小张", mishu);
NBAObserver worker2 = new NBAObserver("小李", mishu); mishu.Update += worker1.StockUpdate; //绑定委托
mishu.Update += worker2.NBAUpdate; //绑定委托 mishu.SubjectState = "老板回来了";
mishu.Notify(); //调用委托 Console.ReadLine();
}
}
}
测试结果：
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