c#判断输入文字是否是数字

/**//// <summary> 
/// 名称：IsNumberic 
/// 功能：判断输入的是否是数字 
/// 参数：string oText：源文本 
/// 返回值：　bool true:是　false:否 
/// </summary> 
public bool IsNumberic(string oText) 
{ 
try 
{ 
int var1=Convert.ToInt32 (oText); 
return true; 
} 
catch 
{ 
return false; 
} 
}
     try catch方法
     例：
     try
     {
       Convert.ToInt32("123"):
       Console.Write("是数字");
     }
     catch(Exception ex)
     {
       Console.Write("非数字");
     }
     注：如果有很多字符串要求判断，此方法需要大量的try catch 以及finally来处理后续的程序.不建议使用此方法。
改进一下:
因为可以转int 可以转Decimal
    public bool IsNumberic(string oText)
    {
        try
        {
            Decimal Number = Convert.ToDecimal (oText);
            return true;
        }
        catch
        {
            return false;
        }
    }

//如果是纯数字还可以采用ASCII码进行判断
/// <summary>   
/// 判断是否是数字   
/// </summary>   
/// <param name="str">字符串</param>   
/// <returns>bool</returns>   
public bool IsNumeric(string str)   
{   
    if (str == null || str.Length == 0)   
        return false;   
    System.Text.ASCIIEncoding ascii = new System.Text.ASCIIEncoding();   
    byte[] bytestr = ascii.GetBytes(str);   
    foreach (byte c in bytestr)   
    {   
        if (c < 48 || c > 57)   
        {   
            return false;   
        }   
    }   
    return true;   
} 

using System;
using System.Collections.Generic;
using System.Text.RegularExpressions;
namespace LBC.Number
{
    /// <summary>
    /// 数字判断的类
    /// </summary>
    public class NumberClass
    {
        /// <summary>
        /// 判断是否是数字
        /// </summary>
        /// <param name="strNumber">要判断的字符串</param>
        /// <returns></returns>
        public static bool IsNumber(String strNumber)
        {
            Regex objNotNumberPattern = new Regex("[^0-9.-]");
            Regex objTwoDotPattern = new Regex("[0-9]*[.][0-9]*[.][0-9]*");
            Regex objTwoMinusPattern = new Regex("[0-9]*[-][0-9]*[-][0-9]*");
            String strValidRealPattern = "^([-]|[.]|[-.]|[0-9])[0-9]*[.]*[0-9]+___FCKpd___0quot;;
            String strValidIntegerPattern = "^([-]|[0-9])[0-9]*___FCKpd___0quot;;
            Regex objNumberPattern = new Regex("(" + strValidRealPattern + ")|(" + strValidIntegerPattern + ")");
            return !objNotNumberPattern.IsMatch(strNumber) &&
            !objTwoDotPattern.IsMatch(strNumber) &&
            !objTwoMinusPattern.IsMatch(strNumber) &&
            objNumberPattern.IsMatch(strNumber);
        }
        /// <summary>
        /// 判断是否是int类型
        /// </summary>
        /// <param name="Value">要判断的字符串</param>
        /// <returns></returns>
        public static bool IsInt(string Value)
        {
            return Regex.IsMatch(Value, @"^[+-]?/d*___FCKpd___0quot;);
        }
        /// <summary>
        /// 判断是否是数字
        /// </summary>
        /// <param name="Value">要判断的字符串</param>
        /// <returns></returns>
        public static bool IsNumeric(string Value)
        {
            return Regex.IsMatch(Value, @"^[+-]?/d*[.]?/d*___FCKpd___0quot;);
        }
    }
}