Question

Taking the database first approach in MVC3 all of my models are created and stored in a designer.cs

In the code below, I want to force a regex validation of the NDC property. The input needs to resemble 1234-1234-12 or 4 digits a dash 4 digits a dash 2 digits.

public partial class Drug : EntityObject

{
    #region Factory Method

    [EdmScalarPropertyAttribute(EntityKeyProperty=true, IsNullable=false)]
    [DataMemberAttribute()]
        public global::System.String NDC
    {
        [Required(ErrorMessage = "Please enter the Rx NDC")]
        [RegularExpression(@"\d\d\d\d-\d\d\d\d-\d\d", ErrorMessage = "Please enter a correctly formatted NDC")]

        get
        {
            return _NDC;
        }
        set
        {
            if (_NDC != value)
            {
                OnNDCChanging(value);
                ReportPropertyChanging("NDC");
                _NDC = StructuralObject.SetValidValue(value, false);
                ReportPropertyChanged("NDC");
                OnNDCChanged();
            }
        }
    }I dont know how to apply the code above in the code below because I get the this error:

Error 13 Attribute ‘Required’ is not valid on this declaration type. It is only valid on ‘property, indexer, field, param’ declarations. C:\Users\Daniel\Desktop\320Final -Updated\320Final\Models\DBModel.Designer.cs

Answer 1

You’re trying to set the attributes inside of the property:

public global::System.String NDC
{
    [Required(ErrorMessage = "Please enter the Rx NDC")]
    [RegularExpression(@"\d\d\d\d-\d\d\d\d-\d\d", ErrorMessage = "Please enter a correctly formatted NDC")]
    get
    {
        return _NDC;
    }
...

You need to set them on the property itself:

[Required(ErrorMessage = "Please enter the Rx NDC")]
[RegularExpression(@"\d\d\d\d-\d\d\d\d-\d\d", ErrorMessage = "Please enter a correctly formatted NDC")]
public global::System.String NDC
{
    get
    {
        return _NDC;
    }
....