Using dynamic object in ASP.NET MVC model

Question

Edit 1:

I have done some research and would like to simplify the question :

I would like to have a model with a dynamic object.

public dynamic AdditionRuntimeData;

this object will be populated at runtime using a database table. I want to decorate this object as well as property inside this object with DataAnnotations like Required , Range etc at runtime.

It looks like the way to go ahead is to implement ICustomTypeDescriptor however even after the implementation , MVC doesnt like the dynamic object in my model and will not even request metadata for it using the DataAnnotationsModelMetadataProvider.CreateMetadata() method.

Is there a way to get around this problem ?

class Absence
{
    [Required()]
    public Guid EmpID { get; set; }

    [Required(ErrorMessage = "Start date is  manadatory")]
    [DataType(DataType.Date)]
    [DisplayName("Absence Start Date")]
    public DateTime AbsenceStart { get; set; }

    [Required(ErrorMessage = "End date is  manadatory")]
    [DataType(DataType.Date)]
    [DisplayName("Absence End Date")]
    public DateTime AbsenceEnd { get; set; }


    //Populate this using a helper class which reads from DB and creates a object tree at runtime.
    public dynamic AdditionRuntimeData;

}

Note : AdditionRuntimeData could be a object which has child objects or it could just be a simple property with value.

The answer given does not allow such depth.

Community · Accepted Answer · 2017-05-23 12:28:05Z

0

ModelState.AddModelError("Fields[x].SomeProperty", "The Error Message you want to show.);

Check the following link:

Validation of dynamic fields in a MVC

edited May 23, 2017 at 12:28

CommunityBot

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answered Oct 24, 2013 at 13:23

Carlos Landeras

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1 Comment

Pratik Over a year ago

Thanks Carlos , this answers the question partially. I have a more complex object than a List<ClassName> . the custom object I have might contain simple properties( str , int) or it may contain complex object as well e.g : AdditionRuntimeData might have a AdditionRuntimeData.CAR object which has AdditionRuntimeData.CAR.CarMake AdditionRuntimeData.CAR.CarEnginePower property . The CAR child object might have WHEEL obj. I need to have a generic way of being able to assign attributes like REQUIRED or DataType(..Password) to it. Hence need to implemet it as a dynamic object.

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