字符串截取

        /// <summary>
        /// 字符串截取
        /// </summary>
        /// <param name="sourse">源数据字符串</param>
        /// <param name="startstr">开始字符串</param>
        /// <param name="endstr">结束字符串</param>
        /// <returns></returns>
        private static string MidStrEx(string sourse, string startstr, string endstr)
        {
            string result = string.Empty;
            int startindex, endindex;
            try
            {
                startindex = sourse.IndexOf(startstr);
                if (startindex == -1)
                    return result;
                string tmpstr = sourse.Substring(startindex + startstr.Length);
                endindex = tmpstr.IndexOf(endstr);
                if (endindex == -1)
                    return result;
                result = tmpstr.Remove(endindex);
            }
            catch (Exception ex)
            {
            }
            return result;
        }