Add Adaptive AutoSizeColumnsMode to DataGridView

[AssistoraNova]

Currently, DataGridView only supports static sizing modes (AllCells, Fill, etc.).

• AllCells ensures readability but leaves empty space if the total column width is smaller than the grid.
• Fill occupies the full width but may truncate data.

Proposal: Add a new Adaptive mode that first applies AllCells, then checks the total width. If the columns don’t fill the grid, it automatically switches to Fill.

Example usage:
dataGridView1.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.Adaptive;

This would improve usability, save developer time, and provide a responsive layout out-of-the-box.

dataGridView1.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.Adaptive;
var dgv =DataGridView1; dgv.AutoResizeColumns(DataGridViewAutoSizeColumnsMode.AllCells); int totalWidth = dgv.Columns.Cast<DataGridViewColumn>().Sum(c => c.Width); dgv.AutoSizeColumnsMode = totalWidth < dgv.ClientSize.Width ? DataGridViewAutoSizeColumnsMode.Fill : DataGridViewAutoSizeColumnsMode.AllCells;
This would improve usability, save developer time, and provide a responsive layout out‑of‑the‑box.

[paul1956]

@AssistoraNova if you were going to do that today manually where would the code go.

[AssistoraNova]

If I were doing this manually today, I would place the code right after loading data into the DataGridView (for example in the Form_Load event), and also hook it into the form’s Resize event so the adjustment recalculates whenever the control changes size: