p127.cs

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using System;

namespace exam1
{
//	public delegate void ChangedEventHandler(System.DateTime pt);
	//显示了一个类，它包含了具有各种可访问性的成员。调用在Form1的btnP127_Click中
	class MyClass
	{
		public MyClass() 
		{
			Console.WriteLine("Instance constructor");
		}
		public MyClass(int value) 
		{
			MyField = value;
			Console.WriteLine("Instance constructor");
		}
		~MyClass() 
		{
			Console.WriteLine("Destructor");
		}
		public const int MyConst = 12;
		public int MyField = 34;
		public void MyMethod()
		{
			Console.WriteLine("MyClass.MyMethod");
		}
		public int MyProperty 
		{
			get 
			{
				return MyField;
			}
			set 
			{
				MyField = value;
			}
		}
		public int this[int index] 
		{
			get 
			{
				return 0;
			}
			set 
			{
				Console.WriteLine("this[{0}] = {1}", index, value);
			}
		}
		//public event ChangedEventHandler MyEvent;	//声明事件本身
		public event EventHandler MyEvent;

		public void OnEvent()
		{
			System.EventArgs e=null;
			if (MyEvent!= null) MyEvent(this,e);
		}

		public static MyClass operator+(MyClass a, MyClass b) 
		{
			return new MyClass(a.MyField + b.MyField);
		}
	}

	//重载示例
	public struct Complex 
	{
		public int real;
		public int imaginary;

		public Complex(int real, int imaginary) 
		{
			this.real = real;
			this.imaginary = imaginary;
		}

		// Declare which operator to overload (+), the types 
		// that can be added (two Complex objects), and the 
		// return type (Complex):
		public static Complex operator +(Complex c1, Complex c2) 
		{
			return new Complex(c1.real + c2.real, c1.imaginary + c2.imaginary);
		}
		// Override the ToString method to display an complex number in the suitable format:
		public override string ToString()
		{
			return(String.Format("{0} + {1}i", real, imaginary));
		}

		public static void Display() 
		{
			Complex num1 = new Complex(2,3);
			Complex num2 = new Complex(3,4);

			// Add two Complex objects (num1 and num2) through the
			// overloaded plus operator:
			Complex sum = num1 + num2;

			// Print the numbers and the sum using the overriden ToString method:
			Console.WriteLine("First complex number:  {0}",num1);
			Console.WriteLine("Second complex number: {0}",num2);
			Console.WriteLine("The sum of the two numbers: {0}",sum);
 
		}

	}


	//委托示例
	public delegate void SimpleDelegate();	//声明
	class delegateTest
	{
		static void F() 
		{
			System.Console.WriteLine("Test.F");
		}

		public void CallDelegate() 
		{
			SimpleDelegate d = new SimpleDelegate(F); //声明
			d();
		}

		public void MultiCall(SimpleDelegate d, int count) 
		{
			for (int i = 0; i < count; i++) 
			{
				d();
			}
		}

	}


}