[研究][ASP.NET]RSS (用 FileStream 和 StreamWriter)
2022-12-23
RSS（英文全稱：RDF Site Summary 或 Really Simple Syndication），中文譯作簡易資訊聚合，也稱聚合內容，是一種訊息來源格式規範，用以聚合多個網站更新的內容並自動通知網站訂閱者。使用 RSS 後，網站訂閱者便無需再手動檢視網站是否有新的內容，同時 RSS 可將多個網站更新的內容進行整合，以摘要的形式呈現，有助於訂閱者快速獲取重要資訊，並選擇性地點閱檢視。
環境：Visual Studio 2022 + ASP.NET + WebForm + Web Application + C#
********************************************************************************
Default.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs"
Inherits="WebApplication1.Default" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<a href="myfeed.xml">myfeed.xml</a>
</div>
</form>
</body>
</html>
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Default.aspx.cs
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace WebApplication1
{
public partial class Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
FileStream fs = null;
StreamWriter sw = null;
try
{
fs = new FileStream(Server.MapPath(".") + "\\myfeed.xml", System.IO.FileMode.Create,
System.IO.FileAccess.Write);
sw = new StreamWriter(fs);
// Write header of RSS file.
sw.WriteLine("<?xml version=\"1.0\"?>");
sw.WriteLine("<rss version=\"2.0\" xml:base=\"http://www.myWebSite.com\">");
sw.WriteLine("<channel>");
sw.WriteLine("<title>My RSS Feed Title</title>");
sw.WriteLine("<link>http://www.myWebsite.com</link>");
sw.WriteLine("<description>My feed description</description>");
sw.WriteLine("<language>en-us</language>");
sw.WriteLine("<image>");
sw.WriteLine("<title>My Title</title>");
sw.WriteLine("<url>http://www.myWebsite.com/image.gif</url>");
sw.WriteLine("<link>http://www.myWebsite.com</link>");
sw.WriteLine("<width>50</width>");
sw.WriteLine("<height>60</height>");
sw.WriteLine("</image>");
// Done adding header of RSS file.
// Begin adding items (article content).
sw.WriteLine("<item>");
sw.WriteLine("<title>Title of article</title>");
sw.WriteLine("<link>http://www.myWebsite.com/page1.html</link>");
sw.WriteLine("<description><![CDATA[Body of content goes here.<BR>HTML text can be included inside this tag.<BR>]]></description>");
sw.WriteLine("<pubDate>" + System.DateTime.Now.ToString("r") + "</pubDate>");
sw.WriteLine("</item>");
// End adding item (you can continue adding items here).
// Write footer of RSS feed.
sw.WriteLine("</channel>");
sw.WriteLine("</rss>");
}
catch (Exception exp)
{
//Debug.WriteLine("Error: " + exception.Message);
}
finally
{
sw.Close();
fs.Close();
}
}
}
}
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敝人測試，這種作法有個缺點，輸入的文字是靜態確認的，如果參雜了不確定內容的字串變數，會出錯。(例如從資料庫抓出的資料)（有點怪，待研究)
(完)
相關
RSS - 維基百科，自由的百科全書
https://zh.m.wikipedia.org/zh-tw/RSS
System.ServiceModel.Syndication 命名空間
https://learn.microsoft.com/zh-tw/dotnet/api/system.servicemodel.syndication?view=dotnet-plat-ext-7.0
Rss20FeedFormatter 類別 (System.ServiceModel.Syndication) | Microsoft Learn
https://learn.microsoft.com/zh-tw/dotnet/api/system.servicemodel.syndication.rss20feedformatter?view=dotnet-plat-ext-7.0
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