c# - Validating property value, based on another model property -

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i have question regarding property validation, however, haven't yet been able find appropriate answer.

i have following classes

public class indexviewmodel {     public film film { get; set; }      public reviewmodel review { get; set; } }  public class reviewmodel {     [requiredif // fire if 'genre' equal genre.horror]     public string text { get; set; } }  public class film {     public string title { get; set; }     public director director { get; set; }     public genre genre { get; set; } }  public class director {     public string name { get; set; } }  public enum genre {     horror,     thriller,     scifi,     drama }

is possible add [requiredif] attribute on text property in reviewmodel fires validation based on value of genre in film model. appreciated.

i wouldn't recommend using validation attributes when properties need validated aren't in class it's associated with. haven't seen requiredifattribute implementation cuts across models that. (here's 1 different question.)

what simple implementation of ivalidatableobject? quite clear, , mvc check when constructing model.

public class indexviewmodel : ivalidatableobject {     public film film { get; set; }      public reviewmodel review { get; set; }      public ienumerable<validationresult> validate(validationcontext validationcontext)     {         if (film.genre == genre.horror && string.isnullorwhitespace(review.text))         {             yield return new validationresult(                 "please provide review film.",                 new string[] { nameof(review.text) });         }     } }

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