本文整理汇总了VB.NET中System.Windows.DragDrop.DragEnter Attached事件的典型用法代码示例。如果您正苦于以下问题：VB.NET DragDrop.DragEnter Attached事件的具体用法？VB.NET DragDrop.DragEnter Attached怎么用？VB.NET DragDrop.DragEnter Attached使用的例子？那么恭喜您, 这里精选的事件代码示例或许可以为您提供帮助。
在下文中一共展示了DragDrop.DragEnter Attached事件的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的VB.NET代码示例。
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