book.cs

来自「OOP With Microsoft VB.NET And Csharp Ste」· CS 代码 · 共 69 行

using System;

namespace ReadMoreBooks
{
	/// <summary>
	/// Summary description for Book.
	/// </summary>
	public class Book {
		private string m_text = "";
		public int PageLength = 10;
		private string m_title;       

		public string Title 
		{
			get {
				return m_title;
			}
			set {
				m_title = value;
			}
		}

		public string Text 
		{
			get {return m_text;}
			set {m_text =value;}
		}

		public Book() {
			//
			// TODO: Add constructor logic here
			//
		}
		
		public Book(string title,string text)
		{
		
			if ((title !="")&&(text !="")&&(title !=null)&&(text !=null)){
				m_title =title;
				m_text =text;
			}
			else {
				throw new System.Exception("Title or text is an empty string.");
			}
		}
		
		
		public string GetPage(int pageNumber) {
			int start = (pageNumber-1) * PageLength;
			if ((start < Text.Length) && (start >= 0)) {
				if ((start + PageLength) < Text.Length) {
					return Text.Substring(start, PageLength);
				} 
				else {
					return Text.Substring(start, Text.Length - start);
				}
			} 
			else {
				return "";
			}
		}

		public override string ToString()
		{
			return m_title;
		}
	}
}