C#中判断一个输入是否为整数的函数是什么？

Question

public static bool ifNumber(object sNum, out long outint) 
{ 
if (sNum == null) 
{ 
outint = 0; 
return false; 
} 
if (long.TryParse(sNum.ToString(), out outint)) 
return true; 
else 
return false; 
}

Answer 1

        private Boolean IsInteger(String strSrc)
        {
            Boolean bRet = false;   
            if (!String.IsNullOrEmpty(strSrc))
            {
                if (Regex.IsMatch(strSrc, @"[+-]?\d+"))
                {
                    try
                    {
                        Int64 iTemp = Convert.ToInt64(strSrc);
                        bRet = true;
                    }
                    catch
                    {
                    }
                }
            }
            return bRet;
        }

Answer 2

using System;
using System.Collections.Generic;
using System.Text;namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {            string myObj = "a53078323469";            Console.WriteLine(IsNumber(myObj));
            Console.ReadLine();        }        //判断是否数字
        public static bool IsNumber(object sNum)
        {
            long num;   //临时变量
            if (sNum == null)
            {
                return false;   //如果传入的值为NULL，返回False
            }
            if (long.TryParse(sNum.ToString(), out num))    //尝试转换传入的值
                return true;    //成功返回True
            else
                return false;   //失败返回False
        }
    }
}

Answer 3

刚才的正则有点错误，这次的应该可以了        private Boolean IsInteger(String strSrc)
        {
            Boolean bRet = false;
            if (!String.IsNullOrEmpty(strSrc))
            {
                if (Regex.IsMatch(strSrc, @"^[+-]?\d+$"))
                {
                    try
                    {
                        Int64 iTemp = Convert.ToInt64(strSrc);
                        bRet = true;
                    }
                    catch
                    {
                    }
                }
            }
            return bRet;
        }

Answer 4

public void IsNum(string str)
        {
            int b = 123;
            if (int.TryParse(str, out b))
            {
                Response.Write(b);
            }
            else
            {
                Response.Write("Failed to Parse to Int");
            }
        }

Answer 5

你所说的整数有要求么 比如  000001 算么
有最大/小数的限制么.......如果没什么特别要求  用Convert.ToInt32/64 或 int.TryParse ... 等尝试转换就可以了