xmlpagecounter.cs

投票系统模块设计

using System;
using System.Configuration;
using System.IO;
using System.Xml;
using System.Web;

namespace Common
{
	/// <summary>
	/// XmlPageCounter 的摘要说明。
	/// </summary>
	public class XmlPageCounter : IPageCounter
	{
		private string _filepath = string.Empty;
		public XmlPageCounter()
		{
			//从配置文件中读取xml文件路径
			_filepath = ConfigurationSettings.AppSettings["FilePath"];
			_filepath = HttpContext.Current.Server.MapPath(_filepath);

			//初始化XML文档
			InitPageCounter(_filepath);
		}
		#region IPageCounter 成员

		public int GetPageCount()
		{
			//加载XML文档
			XmlDocument doc = new XmlDocument();
			doc.Load(_filepath);

			//定位PageCount节点
			XmlNode node = doc.SelectSingleNode("/SiteStat/PageCount");

			//获取计数器计数结果
			return Convert.ToInt32(node.InnerText);
		}

		public void SetPageCount(int iCount)
		{
			//加载XML文档
			XmlDocument doc = new XmlDocument();
			doc.Load(_filepath);

			//定位PageCount节点
			XmlNode node = doc.SelectSingleNode("/SiteStat/PageCount");

			//设置计数器值
			node.InnerText = iCount.ToString();

			//保存XML文档
			doc.Save(_filepath);
		}

		public void IncreasePageCount()
		{
			//计数器结果加1
			SetPageCount(GetPageCount() + 1);
		}

		#endregion

		/// <summary>
		/// 初始化计数器xml文件
		/// </summary>
		private void InitPageCounter(string strFilePath)
		{
			XmlDocument doc = new XmlDocument();
			if (!File.Exists(strFilePath)) //如果制定的xml文件不存在
			{
				doc.LoadXml("<?xml version='1.0' ?><SiteStat><PageCount>" +
					"0</PageCount></SiteStat>");
				doc.Save(strFilePath);
			}
		}
	}
}