问题
is there any C# method that works similar to Convert.ToBase64String but doesn't generate anything except alphanumeric output?
Thanks!
回答1:
You're probably looking at using something like Base32 encoding then. There is a Base32 encoder/decoder for C# here by Michael Giagnocavo. It uses a combination of capitalized letters and numbers.
There's also a related discussion on StackOverflow here.
EDIT: And if by any chance this is for URL-safe related Base64 encoding, just do Base64 and replace "+" with "-" and "/" with "_". But I'm guessing, you may not want it for that.
回答2:
The answers are a bit outdated now. For the benefit of future searchers: The best way to handle this now in C# is:
byte[] b; // fill your byte array somehow
string s = System.Web.HttpServerUtility.UrlTokenEncode(b);
This returns a Base64-encoded string that is URL-safe (which is what you said you were really after in the comments to your question).
You can then decode it again using, you guessed it:
byte[] b = System.Web.HttpServerUtility.UrlTokenDecode(s);
回答3:
you can replace + or slash with some predefined string if possible.
回答4:
A common variant of base-64 (for use on query-string) is to use '-' and '_' in place of '+' and '/'. Perhaps a bit of Replace(...) at each end would do the job?
回答5:
You can use BitConverter.ToString() which will give you a hex string. However the resulting strings will be longer than Base64 encoding.
回答6:
I was searching for a such like encoder and I used https://github.com/renmengye/base62-csharp/
It's an encoder/decoder in "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz" character space range.
I just wrapped its methods with
System.Text.Encoding.UTF8.GetBytes(plainText);
and
System.Text.Encoding.UTF8.GetString(decoded);
calls to allow it to work easily with strings.
来源：https://stackoverflow.com/questions/933503/c-sharp-method-like-base64string-but-only-alphanumeric-no-plus-or-slash