C#替换字符串起始/结尾指定的字符串

　　　　 #region 替换字符串起始位置(开头)中指定的字符串
        /// <summary>  
        /// 替换字符串起始位置(开头)中指定的字符串  
        /// </summary>  
        /// <param name="s">源串</param>  
        /// <param name="searchStr">查找的串</param>  
        /// <param name="replaceStr">替换的目标串</param>  
        /// <returns></returns>  
        public static string CutStarStr(string s, string searchStr, string replaceStr)
        {
            var result = s;
            try
            {
                if (string.IsNullOrEmpty(result))
                {
                    return result;
                }
                if (s.Length < searchStr.Length)
                {
                    return result;
                }
                if (s.IndexOf(searchStr, 0, searchStr.Length, StringComparison.Ordinal) > -1)
                {
                    result = s.Substring(searchStr.Length);
                }
                return result;
            }
            catch (Exception e)
            {
                return result;
            }
        }
        #endregion

        #region 替换字符串末尾位置中指定的字符串
        /// <summary>  
        /// 替换字符串末尾位置中指定的字符串  
        /// </summary>  
        /// <param name="s">源串</param>  
        /// <param name="searchStr">查找的串</param>  
        /// <param name="replaceStr">替换的目标串</param>  
        public static string CutEndStr(string s, string searchStr, string replaceStr)
        {
            var result = s;
            try
            {
                if (string.IsNullOrEmpty(result))
                {
                    return result;
                }
                if (s.Length < searchStr.Length)
                {
                    return result;
                }
                if (s.IndexOf(searchStr, s.Length - searchStr.Length, searchStr.Length, StringComparison.Ordinal) > -1)
                {
                    result = s.Substring(0, s.Length - searchStr.Length);
                }
                return result;
            }
            catch (Exception e)
            {
                return result;
            }
        }
        #endregion
　　

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