Validation via DataAnnotation Example?

[Jonathan]

Is their an example of how to implement form validation via Annotations?

[Ivaylo Gergov]

Hello,

Currently the Validation in RadDataForm can be achieved either if your item implements ISupportEntityValidation or if you provide the implementation of the interface through the RadDataForm.EntityProvider. I have prepared a sample project which demonstrates the second approach. Please, see the attached file.

I hope this helps. Let me know should you need further assistance.

Regards,
Ivaylo Gergov
Telerik by Progress

[Jonathan]

This helped me get the basic structure in place, but I still don't see how to use Data Annotations from my model in validation.

I could create hardcoded validation for each form in my application, but thats not really a valid solution.

In ValidatePropertyAsync I can access the Entity object and its properties, but I can't access its annotations.  I can see them via Reflection, but not utilize them.

Here's what I'm seeing

        [Telerik.Data.Core.Display(Header = "Value")]
        [Telerik.Data.Core.Required]
        [StringLength(3)]
        public string SomeValue
        

The "Required" annotation sets "IsRequired" on the property that I can use in validation.  How do I access the StringLength annotation and use it in the validation process? 

 

 

[Ivaylo Gergov]

Hello,

Sorry for the late response.

Through the Entity you have access to your business item. For example: 

var item = entity.GetEntityProperty("Value").DataItem;

I hope this helps.

Regards,
Ivaylo Gergov
Telerik by Progress