Andre的答案有一個小小的錯誤，因爲獲得的座標沒有考慮DataGrid中的行和列標題。至少在我在Visual Basic中實現解決方案時就是這種情況。
您還可以修改顯示的示例來說明大型DataGrid。在我看來，有基於滾動的看法，所以我表現出這種修正的兩種實現方式的限制：
Private Sub myGrid_MouseMove(sender As Object, e As MouseEventArgs) Handles myGrid.MouseMove
Dim total As Double
Dim myScrollViewer As ScrollViewer = FindVisualChild(Of ScrollViewer)(myGrid)
Dim cursorPositionX = e.GetPosition(myGrid).X
Dim columnIndex As Integer = -1
total = 0
'Horizontal offset'
Dim rowHeaders As DataGridRowHeader = FindVisualChild(Of DataGridRowHeader)(myGrid)
cursorPositionX -= (rowHeaders.ActualWidth - myScrollViewer.HorizontalOffset)
For Each column As DataGridColumn In myGrid.Columns
If cursorPositionX < total Then Exit For
columnIndex += 1
total += column.Width.DisplayValue
Next
Dim cursorPositionY = e.GetPosition(myGrid).Y
Dim rowIndex As Integer = -1
total = 0
'Vertical offset'
Dim originalOffset As Double = myScrollViewer.VerticalOffset
Dim colHeadersPresenter As DataGridColumnHeadersPresenter = FindVisualChild(Of DataGridColumnHeadersPresenter)(myGrid)
cursorPositionY -= colHeadersPresenter.ActualHeight
For Each row As System.Data.DataRowView In myGrid.Items
If cursorPositionY < total Then Exit For
rowIndex += 1
Dim dgRow As DataGridRow = GetRowByIndex(myGrid, rowIndex)
total += dgRow.ActualHeight
'GetRowByIndex will scroll the view to bring the DataGridRow of interest into view, which throws off the counter. This adjusts for that'
myGrid.UpdateLayout()
If Not myScrollViewer.VerticalOffset = originalOffset Then myGrid.ScrollIntoView(myGrid.Items(CInt(myScrollViewer.ViewportHeight + originalOffset - 1)))
myGrid.UpdateLayout()
If myScrollViewer.VerticalOffset > rowIndex Then cursorPositionY += dgRow.ActualHeight
Next
End Sub
注意，ScrollViewer.HorizontalOffset Property返回與設備無關的像素值，所以我只是彌補我的位置一次循環遍歷列之前。
請注意，如果CanContentScroll = True，則ScrollViewer.VerticalOffset Property將返回項目數。所以在我的例子中，在每個循環中，我用一個項目（DataGridRow）的高度來抵消計數器。如果CanContentScroll = False，那麼可以像列索引循環一樣處理它。
我無法找到.NET 4.0中DataGrid行定義在Visual Basic中，但下面的支撐作用有助於獲得的DataGridRow：
Function GetRowByIndex(ByVal p_dataGrid As DataGrid,
ByVal p_index As Integer) As DataGridRow
Dim row As DataGridRow
row = CType(p_dataGrid.ItemContainerGenerator.ContainerFromIndex(p_index), DataGridRow)
If IsNothing(row) Then
'May be virtualized, bring into view and try again.'
p_dataGrid.UpdateLayout()
p_dataGrid.ScrollIntoView(p_dataGrid.Items(p_index))
row = CType(p_dataGrid.ItemContainerGenerator.ContainerFromIndex(p_index), DataGridRow)
End If
Return row
End Function
和Visual Basic的FindVisualChild功能：
Function FindVisualChild(Of childItem As DependencyObject)(ByVal p_obj As DependencyObject) As childItem
For i As Integer = 0 To VisualTreeHelper.GetChildrenCount(p_obj) - 1
Dim child As DependencyObject = VisualTreeHelper.GetChild(p_obj, i)
If child IsNot Nothing AndAlso TypeOf child Is childItem Then
Return CType(child, childItem)
Else
Dim childOfChild As childItem = FindVisualChild(Of childItem)(child)
If childOfChild IsNot Nothing Then
Return childOfChild
End If
End If
Next i
Return Nothing
End Function
查看FluidKit中的拖放功能。你不必擔心像這樣的hacky shnit。 – Will 2009-08-11 11:12:19
我已經在使用FluidKit，'MouseMove'實際上是'OnDropCompleted'，鼠標位置實際上是'dropPoint' - 我希望能夠放入表格中的特定單元格，而我無法獲得工作尚未。 – Wilka 2009-08-11 12:18:14