将普通字符串格式化为HTML C#_c# 字符串

本文介绍了一种将普通文本转换成HTML的方法，支持格式化文本并自动识别URL与Email地址，将其转化为带有超链接的HTML格式。

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/// <summary>
    /// 将普通字符串格式化为HTML
    /// </summary>
    /// <param name="textStr">所要格式化的字符串</param>
    /// <param name="spotUrlEmail">是否自动识别"http://"或"https://"开头的URL和Email地址，识别出来的URL和Email将会自动加上超链接</param>
    /// <returns>格式化后的HTML代码</returns>
    public static string TextToHTML(string textStr, bool spotUrlEmail)
    {
        StringBuilder html = new StringBuilder(textStr);

        //html.Replace("&", "&");   //2006-4-26修改。不对"&"进行转义了，不然无法处理好多个QueryString的URL
        html.Replace(" ", "  "); //两个空格才转义，是为了较好处理带QueryString的URL后接空格的情况
        html.Replace("<", "<");
        html.Replace(">", ">");
        html.Replace("/"", """);
        html.Replace("/n", "<br />"); //IE中的换行为"/r/n"，FF中为"/n"

        if (spotUrlEmail)
        {
            int offset;

            Regex linkRegex = new Regex("(http(s)?://)([//w-]+//.)+[//w-]+(/[//w-./?&%=]*)?");
            MatchCollection linkMatches = linkRegex.Matches(html.ToString());
            offset = 0;
            foreach (Match match in linkMatches)
            {
                string linkHead = string.Format("<a href=/"{0}/">", match.Value);

html.Insert(match.Index + offset, linkHead);
offset += linkHead.Length;

                html.Insert(match.Index + match.Length + offset, "</a>");
                offset += 4;
            }

            Regex emailRegex = new Regex("//w+([-+.']//w+)*@//w+([-.]//w+)*//.//w+([-.]//w+)*");
            MatchCollection emailMatches = emailRegex.Matches(html.ToString());
            offset = 0;
            foreach (Match match in emailMatches)
            {
                string emailHead = string.Format("<a href=/"mailto:{0}/">", match.Value);

html.Insert(match.Index + offset, emailHead);
offset += emailHead.Length;

                html.Insert(match.Index + match.Length + offset, "</a>");
                offset += 4;
            }
        }

return html.ToString();
}