如何取消选中DataGridView控件中的所有行？ [英] How to deselect all selected rows in a DataGridView control?

问题描述

当用户点击控件的空白（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 ，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()

如果您不想让第一行/单元格显示选择，您可以设置 CurrentCell 属性到没有 / null ，这将暂时隐藏焦点矩形直到控件再次收到焦点：

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

要确定用户何时点击了 DataGridView 的空白部分，您将不得不处理其 MouseUp 事件。在这种情况下，您可以 HitTest 点击位置，并观看此表示 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，您也可以将现有的 DataGridView 控件子类化将所有这些功能组合到单个自定义控件中。您需要覆盖其 OnMouseUp 方法与上述方式类似。我也想提供一个公开的 DeselectAll 方法，以便方便地调用 ClearSelection 方法并设置 CurrentCell property to 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.

（代码示例都是任意的在VB .NET，因为这个问题没有指定一个语言 - 如果这不是你的本地方言，那就是道歉。）

(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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