C#提取html中的汉字

using System.Text.RegularExpressions;      

private string StripHT(string strHtml)  //从html中提取纯文本
        {
            Regex regex = new Regex("<.+?>", RegexOptions.IgnoreCase);
string strOutput = regex.Replace(strHtml, "");//替换掉"<"和">"之间的内容
            strOutput = strOutput.Replace("<", "");
            strOutput = strOutput.Replace(">", "");
            strOutput = strOutput.Replace("&nbsp;", "");
return strOutput;
        }