Check Numeric Only - CSharp System

CSharp examples for System:Int64

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Description

Check Numeric Only

Demo Code


using System.Text;
using System.Collections.Generic;
using System;/*from   w  w  w.j  a  v  a2 s. co  m*/

public class Main{
        internal static bool CheckNumericOnly(string Data)
        {
            //This function takes a string of data and breaks it into parts and trys to do Int64.TryParse
            //This will verify that only numeric data is contained in the string passed in.  The complexity below
            //was done to ensure that the minimum number of interations and checks could be performed.

            //early check to see if the whole number can be parsed to improve efficency of this method
            long value = 0;
            if (Data != null)
            {
                if (Int64.TryParse(Data, out value))
                    return true;
            }
            else
            {
                return false;
            }

            //9223372036854775808 is the largest number a 64bit number(signed) can hold so ... make sure its less than that by one place
            int STRING_LENGTHS = 18;

            string temp = Data;
            string[] strings = new string[(Data.Length / STRING_LENGTHS) + ((Data.Length % STRING_LENGTHS == 0) ? 0 : 1)];

            int i = 0;
            while (i < strings.Length)
            {
                if (temp.Length >= STRING_LENGTHS)
                {
                    strings[i++] = temp.Substring(0, STRING_LENGTHS);
                    temp = temp.Substring(STRING_LENGTHS);
                }//if
                else
                    strings[i++] = temp.Substring(0);
            }

            foreach (string s in strings)
            {
                if (!Int64.TryParse(s, out value))
                    return false;
            }//foreach

            return true;
        }//CheckNumericOnly
}

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