How to automatically set default value for custom property in EDMX Designer Extension?

Question

I created EDM Designer Extension with custom property BaseDiagram. I would like to automatically set BaseDiagram property when adding new entity to diagram. Default BaseDiagram value should be set according to name of diagram where is new entity added. I can set default value in getter, but this value is still the same for all Entities.

using Microsoft.Data.Entity.Design.Extensibility;
using System.ComponentModel;
using System.ComponentModel.Composition;
using System.Linq;
using System.Xml.Linq;

namespace MyNamespace.EFExtPackage
{
  [PartCreationPolicy(CreationPolicy.Shared)]
  [Export(typeof(IEntityDesignerExtendedProperty))]
  [EntityDesignerExtendedProperty(EntityDesignerSelection.ConceptualModelEntityType)]
  public class EFDesignerCustomPropertiesFactory : IEntityDesignerExtendedProperty
  {
    public object CreateProperty(XElement element, PropertyExtensionContext context)
    {
      return new EFDesignerCustomProperties(element, context);
    }
  }

  public class EFDesignerCustomProperties
  {
    internal static readonly string _namespace = "http://myaddress.cz/";
    internal static XName _ns_BaseDiagram = XName.Get("BaseDiagram", _namespace);
    internal const string _category = "Custom";

    private XElement _parent;
    private PropertyExtensionContext _context;

    public EFDesignerCustomProperties(XElement parent, PropertyExtensionContext context)
    {
      _context = context;
      _parent = parent;
    }

    [DisplayName("Base Diagram")]
    [Description("Specifies base diagram for current table")]
    [Category(EFDesignerCustomProperties._category)]
    [DefaultValue(BaseDiagram.Common)]
    public BaseDiagram CustomBaseDiagram
    {
      get
      {
        BaseDiagram propertyValue = BaseDiagram.Common;
        if (_parent.HasElements)
        {
          foreach (XElement element in _parent.Elements())
          {
            if (element.Name == EFDesignerCustomProperties._ns_BaseDiagram)
            {
              string bv = element.Value.Trim();

              switch (bv)
              {
                case "Accounting": propertyValue = BaseDiagram.Accounting; break;
                case "Bussiness": propertyValue = BaseDiagram.Bussiness; break;
                case "Clients": propertyValue = BaseDiagram.Clients; break;
                case "Common": propertyValue = BaseDiagram.Common; break;
                case "Finance": propertyValue = BaseDiagram.Finance; break;
                case "Products": propertyValue = BaseDiagram.Products; break;
                case "Service": propertyValue = BaseDiagram.Service; break;
                case "Stock": propertyValue = BaseDiagram.Stock; break;
              }
            }
          }
        }
        return propertyValue;
      }

      set
      {
        BaseDiagram propertyValue = value;
        using (EntityDesignerChangeScope scope = _context.CreateChangeScope("Set Base Diagram"))
        {
          if (_parent.HasElements)
          {
            bool updated = false;
            foreach (XElement element in _parent.Elements())
            {
              if (element.Name == EFDesignerCustomProperties._ns_BaseDiagram)
              {
                element.SetValue(propertyValue.ToString().Trim());
                updated = true;
                break;
              }
            }

            if (!updated)
            {
              XElement lastChild = _parent.Elements().Last();
              lastChild.AddAfterSelf(new XElement(_ns_BaseDiagram, propertyValue));
            }
          }
          else
          {
            _parent.Add(new XElement(_ns_BaseDiagram, propertyValue.ToString().Trim()));
          }

          scope.Complete();
        }
      }
    }

    public enum BaseDiagram
    {
      Accounting,
      Bussiness,
      Clients,
      Common,
      Finance,
      Products,
      Service,
      Stock
    }
  }
}

---

Pavel Bily

Answer 1

Hi Pavel,

Welcome to the MSDN forum.

I am trying to involve a senior expert into your thread. Please wait for the response. Sorry for any inconvenience.

Good day.

---

Alexander Sun [MSFT]
MSDN Community Support | Feedback to us
Develop and promote your apps in Windows Store
Please remember to mark the replies as answers if they help and unmark them if they provide no help.

Answer 2

Hello,

I´m still waiting for response. Thanks for response.

---

Pavel Bily

Answer 3

Hi Pavel,

Is it possible for you to create a small application which reproduces what you are seeing? This will help us have something which we can have a look at, at our end.

Thanks,

Kunal (MSFT)

Answer 4

I created sample application demonstrating my problem. It´s HERE. First I create New Entity type (table). Then open diagram and click on "Add to diagram". I would like to automatically set my property "Base diagram" according to name of diagram where I first add entity type. 

Example: When I add Entity Type to diagram Stock, I would like to have "Base diagram" property automatically set on Stock.

---

Pavel Bily

Answer 5

Hi Pavel,

There is no way currently to get the diagram the entity belongs to with the public API. I would suggest you to report this issue on the http://entityframework.codeplex.com/ site. Doing this you can provide suggestions to include this in the next release.

Thanks,

Kunal (MSFT)