Invalid length for a Base-64 char array error

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System.Text.UTF8Encoding encoder = new System.Text.UTF8Encoding();
System.Text.Decoder utf8Decode = encoder.GetDecoder();
byte[] todecode_byte = Convert.FromBase64String(DTourPrNo);----->here i am getting error.

int charCount = utf8Decode.GetCharCount(todecode_byte, 0, todecode_byte.Length);
char[] decoded_char = new char[charCount]; utf8Decode.GetChars(todecode_byte, 0, todecode_byte.Length, decoded_char, 0);
string result = new String(decoded_char); return result;

Posted 7-Oct-10 23:14pm

spandananair

Updated 7-Oct-10 23:34pm

v2

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LittleYellowBird 8-Oct-10 5:25am

Hi, I think you need to improve your question, could you explain what the error is? Also, what is the data? You may get answers a bit quicker if you can provide more information. Just a sugggestion. :)

spandananair 8-Oct-10 5:34am

the error is invalid length for base 64 char array

2 solutions

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Nathan St · Answer 1 · 2010-10-08T00:04:00

Solution 1

The contents of DTourPrNo isn't properly base 64 encoded. It should be produced using something like this:

string DTourPrNo = Convert.ToBase64String(System.Text.UnicodeEncoding.Unicode.GetBytes("string content"));

Posted 8-Oct-10 0:04am

Nathan St

Comments

spandananair 8-Oct-10 7:36am

i am sending a mail notification to the user as a link abt this page ,wen the user is clicking the link no error,but wen i login to web and doing the same the page is giving error.

tpno = Request.QueryString["tour"].ToString();
tpno = ObjCon.base64Decode(tpno);
tpno = tpno.Replace("P!r@u#o$t", "");

after this code it goes to that loop.

Nathan St 8-Oct-10 7:49am

That still doesn't show the part where you encode the string - that's where the problem most likely is.

Rajesh Anuhya · Answer 2 · 2010-10-08T00:16:00

hi ..,

i think you are not passing the correct encoding string to the method
FromBase64String

here am explaining with an example...

let say the original string is rajesh
if you encode it using base64 you will get cmFqZXNoDQo=

if decode the encoded sting you will get original string like this ....

<pre lang="vb">? Convert.FromBase64String("cmFqZXNoDQo=")
{byte[8]}
    [0]: 114
    [1]: 97
    [2]: 106
    [3]: 101
    [4]: 115
    [5]: 104
    [6]: 13
    [7]: 10

Thanks
Rajesh B