学步园

    protected void Page_Load(object sender, EventArgs e)
    {
        string str = "asdf进杂货";
        Response.Write(GetChineseWords(str));
        Response.Write("<br/>");
        foreach (char c in str)
        {
            if (Regex.IsMatch(c.ToString (), "^[\u4E00-\u9FFF]+$"))
                Response.Write(c);
        }
    }

    private string GetChineseWords(string str)
    {
        string strRet = string.Empty;
        int start = Convert.ToInt32("4e00", 16);    //范围（0x4e00～0x9fff）
        int end = Convert.ToInt32("9fff", 16);

        foreach (char c in str)
        {
            int ci = (int)c;
            if (ci >= start && ci <= end)
            {
                strRet += c;
            }
        }
        return strRet;
    }

4e00~9fff是中文字符在unicode中的范围。