C# 如何去除或有條件保留 HTML 標籤

/// 

/// 去除 HTML 標籤，可自訂合法標籤加以保留
/// 
/// 來源字串
/// 合法標籤集
/// 
public static string StripTags(string src, string[] reservedTagPool)
{
    return Regex.Replace(
        src,
        String.Format("<(?!{0}).*?>", string.Join("|", reservedTagPool)),
        String.Empty);
}

using System;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        string html = "<div><p>OOXXOOXXOOXXOOXXOOXXOOXX！" + "<img src=\"http://www.OX.com.tw/Images/LoGO.gif\" alt=\"Logo\" /></p></div>";
        string[] reservedTagPool = { "img", "br" };

        TextBox1.Text = html;
        TextBox2.Text = HtmlRemoval.StripTags(html, reservedTagPool);
        Literal1.Text = HtmlRemoval.StripTags(html, reservedTagPool);
    }
}

轉自 http://www.dotblogs.com.tw/hunterpo/archive/2010/11/26/19732.aspx