Question

I often use the validation framework with something like :

[StringLength(10, MinimumLength=5)]
public string MyString{ get; set; }

This allows me specify the MyString length must be between 5 and 10 characters long.

Now I have to check if the string is either 5 long, or 10 long. No other length are allowed.
I’m quite sure the StringLength attribute is inadequate, so how to do that ? Have I to extend the validation framework and how ?

thx

Answer 1

If you can (I’m not familiar with the validation library in question) you can use a regular expression.

The regular expression to validate any character, length 5 or 10, would be:

^.{5}(.{5})?$

If you only have digits, you can use:

^\d{5}(\d{5})?$