How to easily encode and decode a string in Base64 format
Posted on 11/29/2006 3:44:26 AM
in #ASP.NET 2.X
Hi
Yesterday I had a task where I had to encode some string in the Base64 format and then later decode the same back to string. When I first started looking at the System.Convert class, I found the convert to base64 function does not take any string parameter.
You can still convert a string into base64 format in one line of code. The code to convert a string to base64 format is
string str64;
string str64back;
string str="Vikram";
str64 = Convert.ToBase64String(System.Text.Encoding.Unicode.GetBytes(str));
str64back = Text.Encoding.Unicode.GetString(Convert.FromBase64String(str64));
Here I am taking 3 string variable. The variable string is the variable to bhe converted. I first convert the variable to a base64Encoded string(str64) and then convert the base64 string back to simple string that we started with.
Hope this helps
Thanks
Vikram
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Posted on 3/28/2007 12:49:36 AM
hi there Vikram,
In this code you used Encoding.Unicode to get the bytes.
I tried to use Encoding.ASCII and UTF8, both gives the same result (ASCII and UTF8). Only Unicode gives different result.
Take a look here
? convert.ToBase64String( system.Text.Encoding.ASCII.GetBytes( "test string here" ) )
"dGVzdCBzdHJpbmcgaGVyZQ=="
? convert.ToBase64String( system.Text.Encoding.utf8.GetBytes( "test string here" ) )
"dGVzdCBzdHJpbmcgaGVyZQ=="
? convert.ToBase64String( system.Text.Encoding.unicode.GetBytes( "test string here" ) )
"dABlAHMAdAAgAHMAdAByAGkAbgBnACAAaABlAHIAZQA="
Can you give me an explanation for this ?
Thanks and kind regards,
SHC
p.s. I hope you can email me if you any answer :)
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