CODEWITHSUNDEEP
c#asp.net-mvcasp.net-mvc-5
SamJolly
SamJolly

Reputation: 6477

Best way to prevent repetition of Validation annotations in VIewModel?

I have a Viewmodel with about 30 input properties with decimal regex validation ie:

[RegularExpression(@"\d+(\.\d{1,2})?", ErrorMessage = "Invalid decimal")]
public string strProperty { get; set; }

However I do not want to repeat this for every property. Is there a way to more central and DRY about this.

One idea is to define "\d+(.\d{1,2})?" as a constant.

Thanks....

Upvotes: 1

Views: 165

Answers (1)

Evk
Evk

Reputation: 101483

One way that comes to mind is inherit from RegularExpressionAttribute:

public class DecimalAttribute : RegularExpressionAttribute {
    public DecimalAttribute() : base(@"\d+(\.\d{1,2})?") {
        this.ErrorMessage = "Invalid decimal";
    }
}

Then it becomes just:

[Decimal]
public string strProperty { get; set; }

That is assuming you know what you are doing and cannot just make property decimal instead of string.

Upvotes: 2

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