[RESOLVED] PropertyGrid and dynamic Enum from DB

[MyKey0815]

We are using the .NET PropertGrid to edit the Usersettings of our application. If we use Strings or integers than it works perfectly.

Now we need a propery, we call them "Vendor", that store a GUID of the Vendor from a database. But the user didn´t see the GUID in the PG. he can choose beetwen the venders Names in a combobox. This combobox must be loaded from the database

I have start to try to solve that with following code:

Public Overrides Function GetStandardValues(ByVal context As System.ComponentModel.ITypeDescriptorContext) As System.ComponentModel.TypeConverter.StandardValuesCollection
    Dim _Values As New Collections.SortedList

    If _dtVendors.Rows.Count > 0 Then
        For Each _rowVendors In _dtVendors.Rows
           _Values.Add(_rowVendors.VendorsGUID, _rowVendors.VendorsName)
        Next
    End If

    Return _Values

End Function

my question: What is the next step? how can i put the data from the SortedList to the needed standardValueCollection?`

What are the next steps to reach the goal, that not the GUID was shown but the name of the vendor. And how can I store it?

[NickThissen]

So you have a property that returns a GUID, but you want the user to see the corresponding name instead of the GUID?

And you are trying to solve this by using a custom TypeDescriptor? I suppose it might be possible (though I doubt it when the types aren't even the same), but why not simply make the GUID property non-browsable, and add a new property that converts to and from the GUID, but displays the name:

Private _Vendor As GUID

<Browsable(False)> _
Public Property Vendor() As GUID
   Get
      Return _Vendor
   End Get
   Set(ByVal value As GUID)
      _Vendor = value
   End Set
End Property

'Add new property that uses the GUID:
Public Property VendorName() As String
   Get
      Dim guid As GUID = Me.Vendor

      ' use database to get Name from guid number
      Dim name As String = GetNameFromGuid(guid)
      Return name
   End Get
   Set(ByVal value As String)
      Dim guid As GUID = GetGuidFromName(value)
      Me.Vendor = guid
   End Set
End Property

The GetNameFromGuid method looks in the database and retrieves the name corresponding to the GUID passed, while the GetGuidFromName method does the reverse, it uses the name to look up the corresponding guid. This might be a problem if the name isn't unique, but you're going to have that problem anyway. You might also consider making the property ReadOnly, in which case there is no Setter, but the user cannot change the value (only read it).

[MyKey0815]

Very nice and very easy

It´s good that we spoke about that - Tank you