判断一个字符串是否包含另外一个字符串

        /// <summary>
        /// 蛮力法实现字符串匹配
        /// </summary>
        /// <param name="longStr"></param>
        /// <param name="shortStr"></param>
        /// <returns></returns>
        private static bool IsContains(string longStr, string shortStr)
        {
            //字符串总长度
            int longLength = longStr.Length;
            //匹配字符串的长度
            int shortLength = shortStr.Length;
            int j;
            //是否匹配成功的标志，默认未匹配成功
            bool isFunded = false;
            for (int i = 0; i <= longLength-shortLength; i++)
            {
                j = 0;
                while (j < shortLength && shortStr[j] == longStr[i + j])
                {
                    j++;
                }
                if (j == shortLength)
                {
                    isFunded = true;
                    break;
                }
            }
            return isFunded;
        }