如何取消选择 DataGridView 控件中的所有选定行? [英] How to deselect all selected rows in a DataGridView control?

问题描述

当用户单击控件的空白(非行)部分时，我想取消选择 DataGridView 控件中的所有选定行.
我该怎么做?

I'd like to deselect all selected rows in a DataGridView control when the user clicks on a blank (non-row) part of the control.
How can I do this?

推荐答案

要取消选择 DataGridView 中的所有行和单元格，您可以使用 ClearSelection 方法:

To deselect all rows and cells in a DataGridView, you can use the ClearSelection method:

myDataGridView.ClearSelection()

如果您甚至不想显示第一行/单元格被选中，您可以设置CurrentCell 属性 到 Nothing/null，这将暂时隐藏焦点矩形，直到控件再次获得焦点:

If you don't want even the first row/cell to appear selected, you can set the CurrentCell property to Nothing/null, which will temporarily hide the focus rectangle until the control receives focus again:

myDataGridView.CurrentCell = Nothing

要确定用户何时单击了 DataGridView 的空白部分，您将必须处理其 MouseUp 事件.在这种情况下，您可以 HitTest 单击位置并注意它以指示 HitTestInfo.Nowhere.例如:

To determine when the user has clicked on a blank part of the DataGridView, you're going to have to handle its MouseUp event. In that event, you can HitTest the click location and watch for this to indicate HitTestInfo.Nowhere. For example:

Private Sub myDataGridView_MouseUp(ByVal sender as Object, ByVal e as System.Windows.Forms.MouseEventArgs)
    ''# See if the left mouse button was clicked
    If e.Button = MouseButtons.Left Then
        ''# Check the HitTest information for this click location
        If myDataGridView.HitTest(e.X, e.Y) = DataGridView.HitTestInfo.Nowhere Then
            myDataGridView.ClearSelection()
            myDataGridView.CurrentCell = Nothing
        End If
    End If
End Sub

当然，您也可以对现有的 DataGridView 控件进行子类化，以将所有这些功能组合到一个自定义控件中.您需要覆盖它的 OnMouseUp 方法 类似于上面显示的方式.为了方便起见，我还想提供一个公共 DeselectAll 方法，该方法既调用 ClearSelection 方法，又将 CurrentCell 属性设置为 Nothing.

Of course, you could also subclass the existing DataGridView control to combine all of this functionality into a single custom control. You'll need to override its OnMouseUp method similar to the way shown above. I also like to provide a public DeselectAll method for convenience that both calls the ClearSelection method and sets the CurrentCell property to Nothing.

(代码示例都是在 VB.NET 中随意的，因为问题没有指定语言 - 如果这不是您的母语方言，请道歉.)

(Code samples are all arbitrarily in VB.NET because the question doesn't specify a language—apologies if this is not your native dialect.)

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