I'm encrypting values and adding them to the URL. My problem though is that after I run it through HttpUtility.URLEncode I sometimes come up with bad URLs. I get stuff like
www.mysite.com/page.aspx?id=+jdghogjhior==
I think the it's the leading plus that's giving me trouble. Any ideas? What do you guys do?
Similar problems to what this guy talks about: Server.UrlEncode vs. HttpUtility.UrlEncode
You can try to take an encrypted string, convert it to base64 string and send it via url. When you receive it, decode from base64 and decrypt it.
Encoding:
byte[] bt = Encoding.Unicode.GetBytes("5dnjnbf&&#jnb3=+");
string str = Convert.ToBase64String(bt);
Decode:
byte[] bt = Convert.FromBase64String(str);
string s = Encoding.Unicode.GetString(bt);
Is the thing you're encoding by chance already base64 encoded?
If so you'll need to use a "modified" base64 which is compatible with URLs:
... a modified Base64 for URL variant exists, where no padding '=' will be used, and the '+' and '/' characters of standard Base64 are respectively replaced by '-' and '_'
See Code for decoding/encoding a modified base64 URL for example.
I think the + is the only problem, so habitualy I replace it with something else that I know won't be in the query like space (%20)
But in somme case you need spaces
so have you try : Uri.EscapeDataString
Like the link you have posted ?
I tried this and it brought the id across correctly:
<a href='Page.aspx?ID=
<%=server.urlencode(server.htmlencode("+jdghogjhior==")) %>'>Click here</a>
Encodeis and what you expect as result.