去掉html标签

原地址：http://www.cnblogs.com/youring2/archive/2013/04/03/2997826.html

public static string ReplaceHtmlTag(string html, int length = 0)
{
string strText = System.Text.RegularExpressions.Regex.Replace(html, "<[^>]+>", "");
strText = System.Text.RegularExpressions.Regex.Replace(strText, "&[^;]+;", "");

if (length > 0 && strText.Length > length)
return strText.Substring(0, length);

return strText;
}