Custom ValidatorAttribute does not work

[Zombie]

I am not able to make a custom ValidatorAttribute work for a property. This is a short version of my code:

[AttributeUsage(AttributeTargets.Property, AllowMultiple = false, Inherited = false)]
sealed public class TestThisAttribute : ValidationAttribute
{
   public TestThisAttribute()
   {
       NinjaScript.Log("TestThisAttribute::TestAttribute: constructor", LogLevel.Information);
   }

   public override bool RequiresValidationContext { get { return true; } }

   protected override ValidationResult IsValid(object value, ValidationContext validationContext)
   {
      NinjaScript.Log("TestThisAttribute::IsValid: called", LogLevel.Information);
      return new ValidationResult("Input invalid");
   }
}


[NinjaScriptProperty]
[TestThis]
[Display(ResourceType=typeof(Resource), Name="Test integer", GroupName="Test", Order=0)]
public int testInt { get; set; }

I can see that the constructor is being called from the log, but the IsValid method is never called. If it were, it would say that the input is not valid.

Any idea on what I need to do to make a custom ValidationAttribute work for a property in NinjaTrader 8?

[NinjaTrader_ChrisL]

Hello Zombie, thanks for your post.

This topic falls outside of the realm of what our support team is able to assist with. This thread will remain open for any community members to assist. We have a collection of TypeConverters here that you may reference and see if you can find a solution from one of these:

https://ninjatrader.com/support/help...r_to_custo.htm

Best regards.

[Zombie]

Hi Chris,

thanks for the reply. My question is because the code is theoretically correct and follows the guidelines for implementing a custom ValidationAttribute.

I am just wondering if there is something else required from the NT8 side to make it work.

[NinjaTrader_ChrisL]

Hello Zombie, thanks for your reply.

We have never used this kind of property before, and there are no existing examples on how it would work within the platform so trial and error testing would be required to get it to work in the context of NinjaTrader.

Please let me know if I can assist any further.

[Zombie]

Thanks NinjaTrader_ChrisL

[Zombie]

NinjaTrader_ChrisL

I noticed that even built-in validation attributes from System.ComponentModesl.DataAnnotations are not working, except for Range.

For instance, the code below should make sure that the string is non-null and its length does not exceed 5 characters, but the UI completely ignores both requirements:

#region Properties

[Required]
[StringLength(5, ErrorMessage = "The string value cannot exceed 5 characters. ")]
[Display(ResourceType=typeof(Resource), Name="String test", GroupName="NinjaScriptSetup", Order=0)]
public string StringTest { get; set; }

#endregion

Is this expected?

[NinjaTrader_ChrisL]

Hello Zombie, thanks for your reply.

I apologize, but can not speculate. This item is beyond the scope of support I am able to provide, so I am not able to go further into testing it or getting it to work within the context of a NinjaScript object.

Kind regards.

[kujista]

Hello Zombie: Did you solve this problem about validation string?