How to find out which DataGridView rows are currently onscreen?

c# datagridview virtualmode
Seidleroni picture Seidleroni · May 18, 2011 · Viewed 22.4k times · Source

In my C# (2010) application I have a DataGridView in Virtual Mode which holds several thousand rows. Is it possible to find out which cells are onscreen at the moment?

Answer

Alireza Maddah picture Alireza Maddah · May 18, 2011 
public void GetVisibleCells(DataGridView dgv)
    {
        var visibleRowsCount = dgv.DisplayedRowCount(true);
        var firstDisplayedRowIndex = dgv.FirstDisplayedCell.RowIndex;
        var lastvisibleRowIndex = (firstDisplayedRowIndex + visibleRowsCount) - 1;
        for (int rowIndex = firstDisplayedRowIndex; rowIndex <= lastvisibleRowIndex; rowIndex++)
        {
            var cells = dgv.Rows[rowIndex].Cells;
            foreach (DataGridViewCell cell in cells)
            {
                if (cell.Displayed)
                {
                    // This cell is visible...
                    // Your code goes here...
                }
            }
        }
    }

Updated: It now finds visible cells.

Related questions

implementing virtual mode for a datagridview that is databound

A general question for advice on the implementation. I've got a collection bound to a datagridview. BindingList<Line> allLines = new BindingList<Line>(); dataGridView1.DataSource = allLines; I want to implement virtual mode because the collection could contain …

Read More
How to add a new row to datagridview programmatically

if add row to DataTable DataRow row = datatable1.NewRow(); row["column2"]="column2"; row["column6"]="column6"; datatable1.Rows.Add(row); How about DataGridView??

Read More
Index of Currently Selected Row in DataGridView

It's that simple. How do I get the index of the currently selected Row of a DataGridView? I don't want the Row object, I want the index (0 .. n).

Read More