在Web站點中創建和使用Rss源（一）

using System;
using System.Data;
using System.Configuration;
using System.Xml;
using System.Text;
using System.IO;
using System.Collections.Generic;

/// <summary>
/// Rss 的摘要說明
/// </summary>
public class Rss
{
    private Stream outputStream;
    public Stream OutputStream
    {
        get { return outputStream; }
        set { outputStream = value; }
    }

    private string rssTitle;
    public string RssTitle
    {
        get { return rssTitle; }
        set { rssTitle = value; }
    }

    private string publisherUrl;
    public string PublisherUrl
    {
        get { return publisherUrl; }
        set { publisherUrl = value; }
    }

    private string description;
    public string Description
    {
        get { return description; }
        set { description = value; }
    }

    private string copyright;
    public string Copyright
    {
        get { return copyright; }
        set { copyright = value; }
    }

    private string generator;
    public string Generator
    {
        get { return generator; }
        set { generator = value; }
    }

    private DataSet itemSource;
    public DataSet ItemSource
    {
        get { return itemSource; }
        set { itemSource = value; }
    }

    private string itemTitleField;
    public string ItemTitleField
    {
        get { return itemTitleField; }
        set { itemTitleField = value; }
    }

    private string itemUrlField;
    public string ItemUrlField
    {
        get { return itemUrlField; }
        set { itemUrlField = value; }
    }

    private string itemDescriptionField;
    public string ItemDescriptionField
    {
        get { return itemDescriptionField; }
        set { itemDescriptionField = value; }
    }

    private string itemPublicationDateField;
    public string ItemPublicationDateField
    {
        get { return itemPublicationDateField; }
        set { itemPublicationDateField = value; }
    }

    private string itemAuthor;
    public string ItemAuthor
    {
        get { return itemAuthor; }
        set { itemAuthor = value; }
    }


    public static void PublishRss(Rss r)
    {
        XmlTextWriter writer = new XmlTextWriter(r.OutputStream, Encoding.UTF8);
        writer.WriteStartDocument();
        writer.WriteStartElement("rss");
        writer.WriteAttributeString("version", "2.0");
        writer.WriteStartElement("channel");
        writer.WriteElementString("title", r.RssTitle);
        writer.WriteElementString("link", r.PublisherUrl);
        writer.WriteElementString("Description", r.Description);
        writer.WriteElementString("copyright", r.Copyright);
        writer.WriteElementString("generator", r.Generator);

        foreach (DataRow row in r.itemSource.Tables[0].Rows)
        {
            writer.WriteStartElement("item");
            writer.WriteElementString("author", row[r.ItemAuthor].ToString());
            writer.WriteElementString("title", row[r.ItemTitleField].ToString());
            writer.WriteElementString("link", row[r.itemUrlField].ToString());
            writer.WriteElementString("description", row[r.ItemDescriptionField].ToString());
            writer.WriteElementString("pubDate", GetRssDate(row[r.ItemPublicationDateField]));
            writer.WriteEndElement();
        }
        writer.WriteEndElement();
        writer.WriteEndElement();
        writer.WriteEndDocument();
        writer.Flush();

    }

    public static string GetRssDate(Object date)
    {
        DateTime rssDate = Convert.ToDateTime(date);
        string[] monthName = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
        StringBuilder sb = new StringBuilder();
        sb.Append(rssDate.Day);
        sb.Append(" ");
        sb.Append(monthName[Convert.ToInt32(rssDate.Month) - 1]);
        sb.Append(" ");
        sb.Append(rssDate.Year);
        sb.Append(" ");
        sb.Append(rssDate.ToLongTimeString());

        return sb.ToString();
    }

}