Error Object of type 'System.Windows.Data.Binding' cannot be converted to type 'System.String'

Question

Hello,
I've this usercontrol here: showthread.php
that have the property SelectedEndianess

and in my app the the property:

  Private Const m_Defaultendianess = 0
    Private _myendianess As String = m_Defaultendianess
    <DefaultValue(m_Defaultendianess)>
    Public Property myEndianess() As String
        Get
            Return _myendianess
        End Get
        Set(ByVal value As String)
            SetAndNotify(_myendianess, value) 
        End Set
    End Property

I'm trying to bind them so:

<local:myBitButton  x:Name="mybtnBitButton" Grid.Row="1" EndianessChanged="{s:Action mybtnBitButton_EndianessChanged}" SelectedEndianess="{Binding myEndianess , UpdateSourceTrigger=PropertyChanged}" ></local:myBitButton>

but I'm getting this error: XDG0062 Object of type 'System.Windows.Data.Binding' cannot be converted to type 'System.String'.

I've also another similar usercontrol with the same iusse..
I get also System.Windows.Markup.XamlParseException: 'You cannot set 'Binding' for the 'SelectedEndianess' property of type 'myBitButton'. You can only set 'Binding' for a DependencyProperty element of a DependencyObject element.'

Any advice?

Answer 1

Hi Ajeje,
for binding you must implement DependencyProperty like this:

  Public Shared ReadOnly myEndianessProperty As DependencyProperty =
            DependencyProperty.RegisterAttached("myEndianess", GetType(String),
              GetType(Window023UC1), New PropertyMetadata(String.Empty, AddressOf OnmyEndianessPropertyChanged))

  Private Shared Sub OnmyEndianessPropertyChanged(d As DependencyObject, e As DependencyPropertyChangedEventArgs)
    Dim uc = TryCast(d, Window023UC1)
    If uc Is Nothing OrElse e.NewValue Is Nothing Then Exit Sub
    uc.myEndianess = e.NewValue.ToString
  End Sub

  Public Shared Function GetFarbe(obj As DependencyObject) As Brush
    Return CType(obj.GetValue(myEndianessProperty), Brush)
  End Function

  Public Shared Sub SetFarbe(obj As DependencyObject, value As Brush)
    obj.SetValue(myEndianessProperty, value)
  End Sub

  Private Const m_Defaultendianess = "0"
  Private _myendianess As String = m_Defaultendianess
  <DefaultValue(m_Defaultendianess)>
  Public Property myEndianess() As String
    Get
      Return _myendianess
    End Get
    Set(ByVal value As String)
      SetAndNotify(_myendianess, value)
    End Set
  End Property