检查滚动条在数据网格视图中是否可见

Question

I would like to display something if the data grid View is long and showing a scroll bar but don't know how to check if the scroll bar is visible. I can't simply add the rows since some may be not visible. I can't use an event since my code is already in an event.

Answer 1

you can try this out:

foreach (var scroll in dataGridView1.Controls.OfType<VScrollBar>())
{
   //your checking here
   //specifically... if(scroll.Visible)
}

Answer 2

I prefer this one :

//modif is a modifier for the adjustment of the Client size of the DGV window
//getDGVWidth() is a custom method to get needed width of the DataGridView

int modif = 0;
if (DataGridView.Controls.OfType<VScrollBar>().First().Visible)
{
    modif = SystemInformation.VerticalScrollBarWidth;
}
this.ClientSize = new Size(getDGVWidth() + modif, [wantedSizeOfWindow]);

so the only Boolean condition you need is:

if (DataGridView.Controls.OfType<VScrollBar>().First().Visible)
{
    //want you want to do
}

Answer 3

The DataGridView 's Scrollbars Property can be questioned using the ScrollBars Enumeration by masking it with the one you are interested in like this:

if ((dataGridView1.ScrollBars & ScrollBars.Vertical) != ScrollBars.None) ...

Note, that the two 'ScrollBars' are different things here!

Answer 4

To determine if the vertical scrollbar is present, you need to check how tall your visible rows are and compare against the datagridview height.

if(dgv1.Height > dgv1.Rows.GetRowsHeight(DataGridViewElementStates.Visible))
{
    // Scrollbar not visible
}
else
{
    // Scrollbar visible
}

Though to be more exact you may need to include a check of column widths as the presence of a horizontal scrollbar could create a vertical scrollbar that otherwise isn't there.

Answer 5

The answer from terrybozzio works only if you use the System.Linq namespace. A solution without using System.Linq is shown below:

foreach (var Control in dataGridView1.Controls)
{
    if (Control.GetType() == typeof(VScrollBar))
    {
        //your checking here
        //specifically... if (((VScrollBar)Control).Visible)
    }
}