c# 中验证输入字符串是否是数字（包括小数）

      public bool CheckMoney(string money)  //验证输入字符串是否是数字（包括小数）

      {

            bool flag = true;

            int count = 0;

            if (money.Length == 0)

            {

                flag = false;

                MessageBox.Show("请输入金额！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);

            }

            else

            {

                char[] x = money.ToCharArray();

                for (int i = 0; i < money.Length; i++)

                {

                    if (!char.IsNumber(x[i]) && x[i] != '.')

                    {

                        flag = false; break;

                    }

                    if (x[i] == '.')

                    {

                        count++;

                        if (i == 0 || i == money.Length - 1) flag = false;

                    }

                }

                if (count > 1) flag = false;

                if (!flag) MessageBox.Show("输入金额的格式不正确！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);

            }

            return flag;

        }