Adding attributes to Entity Framework autogenerated properties

Question

I need to add some attributes to properties that were autogenerated by Entity Framework and do not want to lose them when regenerating objects. I don't want to touch T4 either.

Looking interenet I found that the partial class can be added MetaDataType like:

<MetadataType(GetType(Employee_Metadata))> _
Partial Public Class employee
...

And then create another class where we add the actual metadata to properties:

Public Class Employee_Metadata

    <Category("General"), DisplayName("Name"), Description("Employee name.")> _
    Public Property employee_name() As String
        Get
            Return _employee_name
        End Get
        Set(value As String)
            _employee_name = value
        End Set
    End Property
    Private _employee_name As String

End Class

Now, what else I need to do to get access to the attributes? I am currently binding a UI component to class employee autogenerated property "employee_name" (using MVVM). Do I need to change further something in my partial class or should I change the databinding itself (WPF in this case)?

Costas · Accepted Answer · 2013-08-21 12:51:45Z

1

This should work:

Choose a different name for the mapped property in the designer (e.g. employee_name_private) and mark both setter and getter in the designer as Private.

In a partial class file define the public property with the required attributes:

Partial Public Class Employee

    <Category("General"), DisplayName("Name"), Description("Employee name.")> _
    Public Property employee_name() As String
        Get
            Return employee_name_private
        End Get
        Set(value As String)
            employee_name_private = value
        End Set
    End Property

End Class

answered Aug 21, 2013 at 12:51

Costas

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