截取字符串，采集文章时用的到

        /// <summary>
        /// 取中间部分字符串
        /// </summary>
        /// <param name="strBody">原来的主字符串</param>
        /// <param name="strStart">开始截取的字符串（不包含此段代码）</param>
        /// <param name="strEnd">停止截取的字符串（不包含此段代码）</param>
        /// <returns>返回strBody字符串</returns>
        public static string GetMidString(string strBody,string strStart, string strEnd)
        {
            int intStart = strBody.IndexOf(strStart) + strStart.Length;
            int intEnd = strBody.IndexOf(strEnd);
            int intLength = intEnd - intStart;
            strBody = strBody.Substring(intStart, intLength);
            return strBody;       
        }