Is Base Encoded - CSharp System

CSharp examples for System:String Encode Decode

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Description

Is Base Encoded

Demo Code


using System.Windows.Forms;
using System.IO;/*from   w w w  .  j  av  a2s. c  om*/
using System.Text;
using System.Linq;
using System.Collections.Generic;
using System;

public class Main{
        public static bool IsBase64Encoded(string base64String)
        {
            // /part of the code came from: oybek http://stackoverflow.com/users/794764/oybek
            //string s = base64String.Trim();
            //base64String = base64String.Trim();

            if (base64String == null ||
                base64String.Length == 0 ||
                base64String.Length % 4 != 0 ||
                base64String.Contains(" ") ||
                base64String.Contains("\t") ||
                base64String.Contains("\r") ||
                base64String.Contains("\n"))
                return false;

            // String length should be divisible by 4 with no remainder.

            // https://en.wikipedia.org/wiki/Base64
            // Base64 transfer encoding for MIME manates a '=' pad character. (RFC 2045)
            // Standard 'base64' encoding for RFC 3548 or RFC 4648 - mandated '=' unless another doc says otherwise.
            // In testing of various base64 encoded strings I see that some will not end with an equal sign.
            //if (!base64String.EndsWith("="))
            //    return false;

            try
            {
                Convert.FromBase64String(base64String);
                return true;
            }
            catch (Exception ex)
            {
                // Handle the exception
            }
            return false;
        }
}

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