rss.cs

该项目中对 SQLHelper 类进行了简单封装

/* 
 * Rss.cs @Microsoft Visual Studio 2008 <.NET Framework 3.5>
 * AfritXia
 * 2007-04-01
 * 
 * Copyright(c) http://www.AfritXia.NET/
 * 
 */

using System;
using System.Collections;
using System.IO;
using System.Text;
using System.Xml;

namespace NET.AfritXia.RssFoundation
{
	/// <summary>
	/// RSS 聚合功能类
	/// </summary>
	public sealed class Rss
	{
		// rss 根标记
		private RssRootTag m_root = null;
		// Item 列表
		private IList m_objectItemList = null;
		// RSS 项目转换器
		private IRssItemTagConverter m_itemTagConverter = null;

		#region 类构造器
		/// <summary>
		/// 类默认构造器
		/// </summary>
		internal Rss()
		{
			// 根标记
			this.m_root = new RssRootTag();
			// /.version
			this.m_root.Version = "2.0";
			// /channel/generator
			this.m_root.Channel.Generator = "NET.AfritXia.RssFoundation";
		}
		#endregion

		/// <summary>
		/// 获取 rss 根标记
		/// </summary>
		public RssRootTag Root
		{
			get
			{
				return m_root;
			}
		}

		/// <summary>
		/// 设置或获取项目转换器
		/// </summary>
		public IRssItemTagConverter ItemTagConverter
		{
			internal set
			{
				this.m_itemTagConverter = value;
			}

			get
			{
				return this.m_itemTagConverter;
			}
		}

		/// <summary>
		/// 添加一组 item 数据对象
		/// </summary>
		/// <param name="enumerable"></param>
		public void AddDataItems(IEnumerable enumerable)
		{
			for (IEnumerator enumerator = enumerable.GetEnumerator(); enumerator.MoveNext();
				this.AddDataItem(enumerator.Current)) ;
		}

		/// <summary>
		/// 添加一个 item 数据对象
		/// </summary>
		/// <param name="value"></param>
		public void AddDataItem(object value)
		{
			if (this.ItemTagConverter == null)
				throw new NullReferenceException("转换器为空 ( ItemTagConverter is null )");

			if (this.m_objectItemList == null)
				this.m_objectItemList = new ArrayList();

			// 将 value 转换为 item 标记
			this.Root.Channel.ItemList.Add(this.ItemTagConverter.Convert(value));
		}

		/// <summary>
		/// 清除 item 数据集合
		/// </summary>
		public void ClearDataItems()
		{
			if (this.m_objectItemList == null)
				return;

			this.m_objectItemList.Clear();
		}

		/// <summary>
		/// 将 XML 字符串保存到流中
		/// </summary>
		/// <param name="output"></param>
		public void WriteXmlContent(Stream output)
		{
			if (output == null)
				return;

			// XML 写出流设置类
			XmlWriterSettings xwSettings = new XmlWriterSettings();
			// UTF-8
			xwSettings.Encoding = Encoding.UTF8;
			// 缩进元素
			xwSettings.Indent = true;

			// 创建 XML 文本写出器
			XmlWriter writer = XmlWriter.Create(output, xwSettings);

			// 输出 XML
			this.Root.WriteXml(writer);

			writer.Flush();
			writer.Close();
		}
	}
}