C#判断字符串中是否有数字

 // <summary>
        /// 提取字符串中的数字字符串
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static bool IsNumber(String str)
        {
            bool result = false;
            for (int i = ; i < str.Length; i++)
            {
                if (Char.IsNumber(str, i))
                {
                    result = false;
                }
                else
                {
                    result = true;
                }
            }
            return result;
        }

       /// <summary>
       /// 判断是否是数字还是自负串
       /// </summary>
       /// <param name="str"></param>
       /// <returns></returns>
        private bool IsNumeric(string str)
        {

            foreach (char c in str)
            {
                if (!Char.IsNumber(c))
                {
                    return false;
                }
            }
            return true;
        }

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