Csharp: Searching Within a String

 /// <summary>    /// 20130118    /// 搜索字符串    /// 塗聚文 締友計算機信息技術有限公司    /// 捷為工作室    /// </summary>    public class StringSearchClass    {        /// <summary>        /// 查找字符串        /// StringIndexOf("1,2,3,4,5,6", "1,8");        /// </summary>        /// <param name="str1">字符串</param>        /// <param name="judgestr">找查的字符串</param>        /// <returns>返回是否存在</returns>        public static bool StringIndexOf(string str1, string searchstr)        {            bool isExist = true;            str1 = "," + str1 + ",";            string[] strs = searchstr.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);            foreach (string strtemp in strs)            {                if (str1.IndexOf(',' + strtemp + ',') == -1)                {                    isExist = false;                    break;                }            }            return isExist;        }        /// <summary>        /// 查找字符串         /// 塗聚文        /// </summary>        /// <param name="str1">字符串</param>        /// <param name="judgestr">找查的字符串</param>        /// <returns></returns>        public static bool StringContains(string str1, string searchstr)        {            bool isExist = true;            str1 = "," + str1 + ",";            string[] strs = searchstr.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);            foreach (string strtemp in strs)            {                if (!str1.Contains(',' + strtemp + ','))                {                    isExist = false;                    break;                }            }            return isExist;        }        /// <summary>        /// 查找字符串        /// 塗聚文        /// </summary>        /// <param name="str1">字符串</param>        /// <param name="judgestr">找查的字符串</param>        /// <returns></returns>        public static bool StringRegex(string str1, string searchstr)        {            bool isExist = true;            str1 = "," + str1 + ",";            string[] strs = searchstr.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);            foreach (string strtemp in strs)            {                if (!Regex.Match(str1, strtemp, RegexOptions.IgnoreCase).Success)                {                    isExist = false;                }            }            return isExist;        }    }

測出試：

//測試            Stopwatch sw = new Stopwatch();                        sw.Start();           // bool s = StringIndexOf("1,2,3,4,5,6", "1,6");//True,所耗時間：00:00:00.0003557           // bool s = StringContains("1,2,3,4,5,6", "1,6");//True,所耗時間：00:00:00.0003625            bool s = StringRegex("1,2,3,4,5,6", "1,6");//False,所耗時間：00:00:00.0286617 //True,所耗時間：00:00:00.0008295 //True,所耗時間：00:00:00.0008237           sw.Stop();           this.textBox1.Text=s.ToString()+",所耗時間："+sw.Elapsed.ToString();