C#•2w ago

Immediate.Validations conditional validators and delegates

Trying to reimplement some of my FluentValidation rules in IV and a lot of my rules depend on .When() and Must(). I see that AdditionalValidators is something I can define but the example in the docs makes it look like a lot of boilerplate in comparison

13 Replies

viceroypenguin•2w ago

keep in mind that you can create your own attribute validators for use as well

KevSOP•2w ago

If I do and it feels like a common thing, such as "Valid File Path", should I submit a PR?

viceroypenguin•2w ago

in your case, if you want to validate an IPAddress, then you could do something like:

public sealed class IpAddressAttribute : ValidatorAttribute
{
  public static bool ValidateProperty(string target)
  {
    // check whether `target` is an ip address
    return true;
  }

  public static string DefaultMessage => "Invalid IP Address";
}

public sealed class IpAddressAttribute : ValidatorAttribute
{
  public static bool ValidateProperty(string target)
  {
    // check whether `target` is an ip address
    return true;
  }

  public static string DefaultMessage => "Invalid IP Address";
}

then you can apply it like:

[IpAddress]
public required string Address { get; init; }

[IpAddress]
public required string Address { get; init; }

KevSOP•2w ago

Oh I see, that's less work than I thought it would be

viceroypenguin•2w ago

valid file path probably would not make it in, since that's actually fairly application specific (unix vs windows, is there an abstraction layer of some kind that changes what a "valid" file path is, etc.)

KevSOP•2w ago

Fair. What about conditional validation? I.e. only care about property B if property A is true

viceroypenguin•2w ago

haven't really run into that very often, and i usually just do that via AdditionalValidations

KevSOP•2w ago

Yeah I have a lot of that in my startup options

viceroypenguin•2w ago

you could write a multi-rgument validator

public sealed class NotEmptyIfAttribute(
  [TargetType]
  object isTrue
) : ValidatorAttribute
{
  public static bool ValidateProperty(string target, bool isTrue)
  {
    if (!isTrue)
      return true;

    return !string.IsNullOrWhitespace(target);
  }

  public static string DefaultMessage => "Property is null or whitespace";
}

public sealed class NotEmptyIfAttribute(
  [TargetType]
  object isTrue
) : ValidatorAttribute
{
  public static bool ValidateProperty(string target, bool isTrue)
  {
    if (!isTrue)
      return true;

    return !string.IsNullOrWhitespace(target);
  }

  public static string DefaultMessage => "Property is null or whitespace";
}

KevSOP•2w ago

Like I can pass other properties into a validator?

    
    public bool BoolProp { get; set; } = false;
    [NotEmptyIf(BoolProp)]
    public string TargetProp { get; set; } = string.Empty;

    
    public bool BoolProp { get; set; } = false;
    [NotEmptyIf(BoolProp)]
    public string TargetProp { get; set; } = string.Empty;

viceroypenguin•2w ago

public required bool Enabled { get; init; }
[NotEmptyIf(nameof(Enabled))]
public required string Value { get; init; }

public required bool Enabled { get; init; }
[NotEmptyIf(nameof(Enabled))]
public required string Value { get; init; }

KevSOP•2w ago

Ah nameof okay got it Okay awesome well that's super nice Thanks!

viceroypenguin•2w ago

see this section for more info on that: https://github.com/ImmediatePlatform/Immediate.Validations?tab=readme-ov-file#referencing-other-properties

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Immediate.Validations conditional validators and delegates

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