1、正则表达式

public static string MidStrEx_New(string sourse, string startstr, string endstr)        {            Regex rg = new Regex("(?<=(" + startstr + "))[.\\s\\S]*?(?=(" + endstr + "))", RegexOptions.Multiline | RegexOptions.Singleline);            return rg.Match(sourse).Value;        }

 

2.利用字符串indexof截取：

public 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)            {                Log.WriteLog("MidStrEx Err:" + ex.Message);            }            return result;        }