Raising event in custom control.

Question

Hi all,

I'm writing a custom textblock control thats populate hyperlinks and raises event when clicked to hyperlink.

I wrote this code but I got stucked.

My code is :

Imports System.Text.RegularExpressions
Public Class CustomTextBlock
Inherits TextBlock

Public Event Klik As EventHandler(Of EventArgs)
Public ReadOnly InlineCollectionProperty As DependencyProperty = DependencyProperty.Register("InlineCollection", GetType(String), GetType(CustomTextBlock), New PropertyMetadata(New PropertyChangedCallback(AddressOf CustomTextBlock.InlineChanged)))

Private Shared Sub InlineChanged(ByVal sender As DependencyObject, ByVal e As DependencyPropertyChangedEventArgs)

    DirectCast(sender, CustomTextBlock).Inlines.Clear()

    Dim kelimeler = Split(e.NewValue, " ")
    For i = 0 To kelimeler.Length - 1
        If Regex.Match(kelimeler(i), "(http|ftp|https):\/\/[\w\-_]+(\.[\w\-_]+)+([\w\-\.,@?^=%&:/~\+#]*[\w\-\@?^=%&/~\+#])?").Success Then

            Dim x = New Hyperlink(New Run(kelimeler(i)))
            x.AddHandler(Hyperlink.ClickEvent, New RoutedEventHandler(AddressOf t_Click))
            x.ToolTip = kelimeler(i)
            x.Tag = kelimeler(i)
            DirectCast(sender, CustomTextBlock).Inlines.Add(x)
            If Not i = kelimeler.Length Then DirectCast(sender, CustomTextBlock).Inlines.Add(" ")
        Else
            DirectCast(sender, CustomTextBlock).Inlines.Add(kelimeler(i))
            If Not i = kelimeler.Length Then DirectCast(sender, CustomTextBlock).Inlines.Add(" ")
        End If
        ''//Console.WriteLine(kelime(i).ToString.StartsWith("@"))
    Next
    kelimeler = Nothing
End Sub
Public Property InlineCollection As String
    Get
        Return DirectCast(GetValue(InlineCollectionProperty), String)
    End Get
    Set(ByVal value As String)
        SetValue(InlineCollectionProperty, value)
    End Set
End Property

Private Shared Sub t_Click(ByVal sender As Hyperlink, ByVal e As System.Windows.RoutedEventArgs)
    e.Handled = True
    RaiseEvent Klik(sender, EventArgs.Empty)
End Sub
End Class

This code gives error at RaiseEvent Klik(sender, EventArgs.Empty)

Error is : Cannot refer to an instance member of a class from within a shared method or shared member initializer without an expliticit instance of the class.

Thanks for your answers, Alper

Answer 1

The problem is clearly stated in the exception message. The t_Click method is Shared (which means common to all instances of the class), so it cannot raise an Event that is specific to an instance of the class. You should only raise the event from a method that is not shared.