Reading encoded url in asp.net code behind

Question

I am using this encoding/decoding javascript 64bit from here http://www.webtoolkit.info/javascript-base64.html

so here is the scanrio: from JavaScript i am redireting to a new aspx page and on the page_load i am reading the QueryString id.

Everything working fine but the question is, if i want to encode/decode in asp.net in codebehind how would i do?

i am planning to encode before i redirect to a page from .JS but how would i read the encoded in asp.net code behind?

Damith · Accepted Answer · 2012-04-20 15:25:20Z

1

Everything working fine but the question is, if i want to encode/decode in asp.net in codebehind how would i do?

use below methods in code behind to encode and decode.

static public string DecodeFrom64(string encodedData)
{
    byte[] encodedDataAsBytes
        = System.Convert.FromBase64String(encodedData);
    string returnValue =
        System.Text.ASCIIEncoding.ASCII.GetString(encodedDataAsBytes);
    return returnValue;
}

static public string EncodeTo64(string toEncode)
{
    byte[] toEncodeAsBytes
            = System.Text.ASCIIEncoding.ASCII.GetBytes(toEncode);
    string returnValue
            = System.Convert.ToBase64String(toEncodeAsBytes);
    return returnValue;
}

i am planning to encode before i redirect to a page from .JS but how would i read the encoded in asp.net code behind?

you can call DecodeFrom64 method to decode encoded text using JS.

Test :

 input = "Abu Hamzah"
 JS encoded text = "QWJ1IEhhbXphaA=="

DecodeFrom64("QWJ1IEhhbXphaA==") result is "Abu Hamzah" and EncodeTo64("Abu Hamzah") result is "QWJ1IEhhbXphaA==" as expected.

Edit:

Add base64 encode decode java script

<script type="text/javascript" src="/js/webtoolkit.base64.js">

you can download it from here http://www.webtoolkit.info/djs/webtoolkit.base64.js

in your javascript you can call this method as below

window.location.href="mypage.aspx?id=" + Base64.encode('Test');

if you want to decode this query string parameter from server side, then you can use DecodeFrom64 method

edited Apr 20, 2012 at 15:25

answered Apr 20, 2012 at 4:31

Damith

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7 Comments

Nick Kahn Over a year ago

thanks for the detail answer, but i am still not sure, how the encode/decode will work from js, somethign like this.. window.location.href="mypage.aspx?id= + EncodeTo64("Test") ? how does the javascript have a ref to EncodeTo64 method?

Damith Over a year ago

you don't need to call C# method from js for encode and decode. use js functions for that. when you need to do it from code behind you can use C# methods. both encode and decode will give you same results.

Nick Kahn Over a year ago

i am getting this error Microsoft JScript runtime error: Object expected i tried using like this in js window.location.href="mypage.aspx?id= + EncodeTo64("Test")

Nick Kahn Over a year ago

i am getting this error now in DecodeFrom64 method Invalid character in a Base-64 string.

Nick Kahn Over a year ago

i have a guid id 37945704-cf86-4b2e-a4b5-0db0204902c8

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