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.NET Forum / Languages / C# / February 2008Check Base64String.
How to check if provided string is Base64String. > How to check if provided string is Base64String. The easiest thing would be to call Convert.FromBase64String and catch the FormatException. It's not terribly nice, and will be inefficient if you have *lots* of these strings to convert, but it's reasonable for a one-off. It's likely to be more reliable than writing your own implementation.  SignatureJon Skeet - <skeet@pobox.com> http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet World class .NET training in the UK: http://iterativetraining.co.uk Jon Skeet [C# MVP] skrev: >> How to check if provided string is Base64String. > [quoted text clipped - 3 lines] > one-off. It's likely to be more reliable than writing your own > implementation. It is easier to force it as a requirement from the supplier of the string. It it not worth the time guessing what a input field is. SignatureBjørn Brox > Jon Skeet [C# MVP] skrev: > >> How to check if provided string is Base64String. [quoted text clipped - 7 lines] > It is easier to force it as a requirement from the supplier of the string. > It it not worth the time guessing what a input field is. We can't possibly make that decision without knowing the application in question. In many cases it's much, much cheaper to check the input in one place rather than pass it down a long chain only for it to cause a fatal error later on. SignatureJon Skeet - <skeet@pobox.com> http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet World class .NET training in the UK: http://iterativetraining.co.uk > How to check if provided string is Base64String. A base64 string will: - have a length that are a multipla of 4 - consist of chars from the set "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/" - end with 0, 1 or 2 '=' But it is not particular faster to check that than to actually convert. Arne Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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