如何确定用户已单击DataGridView而不是单元格

Question

I want to prompt the user to enter new elements into a databound collection when they click in the empty area of a DataGridView . How can I find out if the user has clicked inside of the DataGridView (the grey area by default), but not in a Column / Row / Cell ?

Answer 1

You can use MouseClick event and do a hit test for it.

private void dgv_MouseClick(object sender, MouseEventArgs e)
{
    var ht = dgv.HitTest(e.X, e.Y);

    if (ht.Type == DataGridViewHitTestType.None)
    {
         //clicked on grey area
    }
}

Answer 2

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 void myDataGridView_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e)
{
    //'#See if the left mouse button was clicked
    if (e.Button == MouseButtons.Left) {
        //'#Check the HitTest information for this click location
        if (myDataGridView.HitTest(e.X, e.Y) == HitTestInfo.Nowhere) {
            // Do what you want
        }
    }
}