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c#validationasp.net-mvc-4
loyalflow
loyalflow

Reputation: 14909

Optional validation, if present, must be 8 integers

I have a form field that is optional, but if someone enters data, they have to enter 8 integers only.

What kind of model annotation should I use for this?

Upvotes: 0

Views: 266

Answers (3)

Ilya Ivanov
Ilya Ivanov

Reputation: 23626

Try to use Range attribute, which work properly with nullable types. Specify upper and lower range for your number. Note that if Required is absent - this field is optional. 

[Range(10000000, 99999999, ErrorMessage = "Number must be exactly 8 digit long")]
public int? Field {get; set;}

Upvotes: 1

algreat
algreat

Reputation: 9002

Try this regex expression: ^\d{8}?$

It allows input only 8 digits or nothing.

Upvotes: 0

CorrugatedAir
CorrugatedAir

Reputation: 819

You could try the regular expression attribute with the following regex:

[RegularExpression(@"\d{8}?")]

This means 8 digits, but it's optional

Upvotes: 0

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