check.cs

进存销系统..适合书店的进销存..功能可以满足一般的需求.很简单

using System;
using System.Collections.Generic;
using System.Text;

namespace BookStore.BusinessRule
{
    class Check
    {
        public static bool isNumber(string s)
        {
            int Flag = 0;
            char[] str = s.ToCharArray();
            for (int i = 0; i < str.Length; i++)
            {
                if (Char.IsNumber(str[i]))
                {
                    Flag++;
                }
                else
                {
                    Flag = -1;
                    break;
                }
            }
            if (Flag > 0)
            {
                return true;
            }
            else
            {
                return false;
            }
        }
    }
}