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My problem with MVC validation is that I have a lot of different condition where different message needs to be shown and there isn't enough default attribute type for me to put all those message in. I am aware that I could create custom attribute to solve this problem, but then I realize a lot of the validation I want could be done with simple regex checking, so instead of creating multiple different classes I tried to find a way to have multiple regexp attribute on a property.

After some research I found this SO post which suggest simply to inherit the RegularExpressionAttribute class, which is EXACTLY what I want, but I couldn't do the actual implementation myself as I am fairly new to .NET.

Here's the suggested code:

[AttributeUsage(AttributeTargets.Field | AttributeTargets.Property, AllowMultiple=true)]
public class MultiRegularExpressionAttribute: RegularExpressionAttribute
{
    ...
}

can anyone help me fill the actual content of the class out? I tried to fiddle around and it ran without error, but the isValid method never got visited and I am so very lost.

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  • What do you mean have more error message variety? You can only display one message. Commented Sep 27, 2015 at 11:45
  • I have a lot of different condition where different message needs to be shown and there isn't enough attribute type for me to put all those message in, that's what i meant. Commented Sep 27, 2015 at 11:49
  • You cannot apply AllowMultiple=true to a validation attribute if your expecting to use client side validation. Commented Sep 27, 2015 at 11:53
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