attribute dependent on another field

Question

In a model of my ASP.NET MVC application I would like validate a textbox as required only if a specific checkbox is checked.

Something like

public bo         


        

Answer 1

Using NuGet Package Manager I intstalled this: https://github.com/jwaliszko/ExpressiveAnnotations

And this is my Model:

using ExpressiveAnnotations.Attributes;

public bool HasReferenceToNotIncludedFile { get; set; }

[RequiredIf("HasReferenceToNotIncludedFile == true", ErrorMessage = "RelevantAuditOpinionNumbers are required.")]
public string RelevantAuditOpinionNumbers { get; set; }

I guarantee you this will work!