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东软内部材料（四）asp等相关的教学案例

<%@Page Language="C#"%>

<script runat=server>

	// Defines a product

	public class Product
	{

		// Private members

		string _code;
		string _description;
		double _price;

		// Constructor

		public Product( string initialCode, 
				 string initialDescription,
				 double initialPrice)
		{

			Code = initialCode;
			Description = initialDescription;
			Price = initialPrice;
		}

		public string Description
		{

			get { return _description; }

			set { _description = value; }
			
		}

		public string Code
		{
		
			get { return _code; }
			set { _code = value; }
		}


		public double Price
		{
			get { return _price; }

			set { _price = value; }
		}
	}

	// Define a Products Collection
	public class ProductCollection : IEnumerable
	{

		Hashtable _products;

		public ProductCollection()
		{
			_products = new Hashtable();
		}

		// Implement an enumerator for the products

		public IEnumerator GetEnumerator()
		{
		
			return _products.Values.GetEnumerator();
		}	


		public Product this[ string Code ]
		{

			get { return (Product) _products[Code]; }
			
			set { Add(value); }
		}
		
		public void Add( Product Item )
		{
		
			if ( Item == null )
				throw new ArgumentException("Product can not be null");

			_products.Add(Item.Code,Item);
		}

		public void Remove( Product Item )
		{
			_products.Remove( Item.Code );
		}

	}
	
</script>

<%

	// List products where the price is greater than 40 dollars


	ProductCollection products;
	Product p;

	products = new ProductCollection();

	p = new Product("CAR", "A New Car", 19999.99 );
	products.Add( p );

	p = new Product("HOUSE", "A New House", 299999.99 );
	products.Add( p );

	p = new Product("BOOK", "A New Book", 49.99 );
	products[p.Code] = p;


	Response.Write("<h4>Product List</h4>");

	foreach( Product p2 in products )
	{
		Response.Write (p2.Code + "-" + p2.Description + "-" + p2.Price );
		Response.Write("<BR>");
	}

	products.Remove( products["HOUSE"] );

	Response.Write("<h4>Product List (HOUSE removed)</h4>");

	foreach( Product p2 in products )
	{
		Response.Write (p2.Code + "-" + p2.Description + "-" + p2.Price );
		Response.Write("<BR>");
	}

	Response.Write("<p>");

	Response.Write("<BR>Description for code CAR is:" + 
	                products["CAR"].Description );

%>