大家可不可以帮我写一个示例..判断用户输入的是否为数字..

我自己试着写的..using System;

namespace my {
    public class chooseshubject {
        static void Main() {
            Byte chooseid=0;
            Boolean TorF = false;
            do
            {
                TorF = Byte.TryParse(Console.ReadLine(), out chooseid);
                Conlose.WriteLine("sorry!");
            }
            while (TorF);
        }
    }
}

不行啊..

如果用户输入的不是数字.刚要求用户一直输入,直到输入为数字为至..

用 if 判断

写一个方法...将输入的每个字符和0-9的数字判断...
如果不等就返回false并中断...

用try catch 很简单

输入的字符 回被 Console.ReadLine() 自动转成字符串
所以还要把这个输入变量转成 数字才可以和 0~9 比较

谢谢大家~,,已经改好了..
using System;

    public class chooseshubject {
        static void Main() {

            Byte chooseid=0;
            Boolean TorF = false;
            do
            {
                TorF = Byte.TryParse(Console.ReadLine(), out chooseid);
                if (!TorF)
                {
                    Console.WriteLine("你输入的不是一个数字!");
                }
            }
            while (!TorF);
            }
        }
    }

using System;

namespace ConApp3
{
    /// <summary>
    /// Class1 的摘要说明。
    /// </summary>
    class InputDoubles
    {
        /// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [STAThread]
        static void Main()
        {
            double dBase = GetDouble("Enter the base: ");
            double dExp = GetDouble("Enter the exponent: ");
            Console.WriteLine("{0} th the power of {1} is {2}",
                dBase,dExp,Math.Pow(dBase,dExp));
        }

        static double GetDouble(string strPrompt)
        {
            double dValue = Double.NaN;
            do
            {
                Console.Write(strPrompt);
                try
                {
                    dValue = Double.Parse(Console.ReadLine());
                }
                catch (System.Exception e)
                {
                    Console.WriteLine();
                    Console.WriteLine("You typed an invaild number!");
                    Console.WriteLine("Please try again.");
                    Console.WriteLine();
                }
            } while (Double.IsNaN(dValue));

            return dValue;
        }
    }
}