.NET Designtime Datasource (for Combobox)

Question

.NET Designtime Datasource (for Combobox)

I'm trying to create an ObjectDataSource that I can use to bind to a BindingSource, which in turn needs to bind to a ComboBox.

I created a simple class and a simple list for this class (see below)

The Times list class does not appear in my toolbar, so I cannot drag it into the form, so I can select it as the data source for the binding source.
The second option is to create a new project data source (ObjectDataSource). Here you are prompted to "select the object you want to bind to". I've added a friend / public / private variable to Form1 that instantiates the Times class. However, this variable is not displayed. The only object that appears in my project namespace is Form1.

What am I missing?

Public Class Time
    Private _timeValue As String
    Private _timeDisplay As String

    Public Sub New(ByVal Value As String, ByVal Display As String)
        Me._timeDisplay = Display
        Me._timeValue = Value
    End Sub

    Public Property Display() As String
        Get
            Return Me._timeDisplay
        End Get
        Set(ByVal value As String)
            Me._timeDisplay = value
        End Set
    End Property

    Public Property Value() As String
        Get
            Return Me._timeValue
        End Get
        Set(ByVal value As String)
            Me._timeValue = value
        End Set
    End Property
End Class

Public Class Times : Inherits List(Of Time)
    Public Sub New()

    End Sub
End Class

0

.net vb.net combobox design-time objectdatasource

Ropstah Dec 11. '08 at 11:47

source to share

2 answers

To improve your experience with ObjectDataSource

, consider labeling your data types with [DataObject]

. In addition, there is an attribute [DataObjectMethod]

that defines the possible operations.

0

Marc gravell Dec 11. '08 at 12:22

source to share

Ropstah · Accepted Answer · 2008-12-11T12:34:01+0000

I can add an attribute System.ComponentModel.DataObject

to class

. However, I cannot add System.ComponentModel.DataObjectMethod

to mine Display/Value property

. When I change them to Functions

I get the following error:

'Failed to overload because available New()

does not take this number of arguments

'This works
<System.ComponentModel.DataObject()> _
Public Class Time
    Private _timeValue As String
    Private _timeDisplay As String

    Public Sub New()

    End Sub

    Public Sub New(ByVal Value As String, ByVal Display As String)
        Me._timeDisplay = Display
        Me._timeValue = Value
    End Sub

    'This doesn't work
    <System.ComponentModel.DataObjectMethod()> _
    Public Function getDisplay() As String
        Return Me._timeDisplay
    End Function

    'This doesn't work
    <System.ComponentModel.DataObjectMethod()> _
    Public Function getValue() As String
        Return Me._timeValue
    End Function
End Class

.NET Designtime Datasource (for Combobox)

More articles: