DataGridView Selected Row Move UP and DOWN

Question

How can I allow selected rows in a DataGridView (DGV) to be moved up or down. I have done this before with a ListView. Unfortunetly, for me, replacing the DGV is not an option (curses). By the way, the DGV datasource is a Generic Collection.

The DGV has two buttons on the side, yes, UP & Down. Can anyone help point me in the right direction. I do have the code that I used for the ListView if it'll help (it did not help me).

Answer 1

Just to expand on Yoopergeek's answer, here's what I have. I was not using a DataSource (data is being dropped to registry on form close, and reload on form load)

This sample will keep rows from being moved off the grid and lost, and reselect the cell the person was in as well.

To make things simpler for copy / paste, I modified so you need only change "gridTasks" to your DataGridView's name, rather than renaming it throughout the code.

This solution works only for single cell/row selected.

private void btnUp_Click(object sender, EventArgs e)
{
    DataGridView dgv = gridTasks;
    try
    {
        int totalRows = dgv.Rows.Count;
        // get index of the row for the selected cell
        int rowIndex = dgv.SelectedCells[ 0 ].OwningRow.Index;
        if ( rowIndex == 0 )
            return;
        // get index of the column for the selected cell
        int colIndex = dgv.SelectedCells[ 0 ].OwningColumn.Index;
        DataGridViewRow selectedRow = dgv.Rows[ rowIndex ];
        dgv.Rows.Remove( selectedRow );
        dgv.Rows.Insert( rowIndex - 1, selectedRow );
        dgv.ClearSelection();
        dgv.Rows[ rowIndex - 1 ].Cells[ colIndex ].Selected = true;
    }
    catch { }
}

private void btnDown_Click(object sender, EventArgs e)
{
    DataGridView dgv = gridTasks;
    try
    {
        int totalRows = dgv.Rows.Count;
        // get index of the row for the selected cell
        int rowIndex = dgv.SelectedCells[ 0 ].OwningRow.Index;
        if ( rowIndex == totalRows - 1 )
            return;
        // get index of the column for the selected cell
        int colIndex = dgv.SelectedCells[ 0 ].OwningColumn.Index;
        DataGridViewRow selectedRow = dgv.Rows[ rowIndex ];
        dgv.Rows.Remove( selectedRow );
        dgv.Rows.Insert( rowIndex + 1, selectedRow );
        dgv.ClearSelection();
        dgv.Rows[ rowIndex + 1 ].Cells[ colIndex ].Selected = true; 
    }
    catch { }
}

Answer 2

This should work. I use a BindingSource instead of binding my List directly to the DataGridView:

    private List<MyItem> items = new List<MyItem> {
        new MyItem {Id = 0, Name = "Hello"},
        new MyItem {Id = 1, Name = "World"},
        new MyItem {Id = 2, Name = "Foo"},
        new MyItem {Id = 3, Name = "Bar"},
        new MyItem {Id = 4, Name = "Scott"},
        new MyItem {Id = 5, Name = "Tiger"},
    };

    private BindingSource bs;
    private void Form1_Load(object sender, EventArgs e)
    {
        bs = new BindingSource(items, string.Empty);
        dataGridView1.DataSource = bs;
    }

    private void button1_Click(object sender, EventArgs e)
    {
        if (bs.Count <= 1) return; // one or zero elements

        int position = bs.Position;
        if (position <= 0) return;  // already at top

        bs.RaiseListChangedEvents = false;

        MyItem current = (MyItem)bs.Current;
        bs.Remove(current);

        position--;

        bs.Insert(position, current);
        bs.Position = position;

        bs.RaiseListChangedEvents = true;
        bs.ResetBindings(false);
    }

    private void button2_Click(object sender, EventArgs e)
    {
        if (bs.Count <= 1) return; // one or zero elements

        int position = bs.Position;
        if (position == bs.Count - 1) return;  // already at bottom

        bs.RaiseListChangedEvents = false;

        MyItem current = (MyItem)bs.Current;
        bs.Remove(current);

        position++;

        bs.Insert(position, current);
        bs.Position = position;

        bs.RaiseListChangedEvents = true;
        bs.ResetBindings(false);
    }

    public class MyItem
    {
        public int Id { get; set; }
        public String Name { get; set; }
    }