本文整理匯總了VB.NET中System.Windows.DragDrop.DragEnter Attached事件的典型用法代碼示例。如果您正苦於以下問題：VB.NET DragDrop.DragEnter Attached事件的具體用法？VB.NET DragDrop.DragEnter Attached怎麽用？VB.NET DragDrop.DragEnter Attached使用的例子？那麽, 這裏精選的事件代碼示例或許可以為您提供幫助。
在下文中一共展示了DragDrop.DragEnter Attached事件的1個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的VB.NET代碼示例。
示例1: TryCast
Private _previousFill As Brush = Nothing
Private Sub Ellipse_DragEnter(ByVal sender As System.Object, ByVal e As System.Windows.DragEventArgs)
Dim ellipse = TryCast(sender, Ellipse)
If ellipse IsNot Nothing Then
' Save the current Fill brush so that you can revert back to this value in DragLeave.
_previousFill = ellipse.Fill
' If the DataObject contains string data, extract it.
If e.Data.GetDataPresent(DataFormats.StringFormat) Then
Dim dataString = e.Data.GetData(DataFormats.StringFormat)
' If the string can be converted into a Brush, convert it.
Dim converter As New BrushConverter()
If converter.IsValid(dataString) Then
Dim newFill As Brush = CType(converter.ConvertFromString(dataString), Brush)
ellipse.Fill = newFill
End If
End If
End If
End Sub