DataGridView and Key events

[Lost User]

You need to explain what not working" actually means. As it stands it is anyone's guess what you are doing wrong.

[michaelbarb]

There is not much more to say. Create a new windows form project. Put a DataGridView in the form. Go to the events for the DataGridView. Double click any or all of the key events. Go to the code behind. Put trivial line in each event (int i = 0; i = I+1;) and set a break point. You will never trip the key events. I tried each event without the others present. As a last test I added event "CellValueChanged" to see if I was getting some event and it worked.

namespace DataGridView_Events
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
InitializeTable();
}

    private void InitializeTable()
    {
        dataGridView1.ColumnCount = 3;
        dataGridView1.Columns\[0\].Name = "Column0";
        dataGridView1.Columns\[1\].Name = "Column1";
        dataGridView1.Columns\[2\].Name = "Column2";

        dataGridView1.Rows.Add(5);
        dataGridView1.Rows\[0\].HeaderCell.Value = "Row1";
        dataGridView1.Rows\[1\].HeaderCell.Value = "Row2";
        dataGridView1.Rows\[2\].HeaderCell.Value = "Row3";

        for (int i = 0; i < 3; i++)
        {
            dataGridView1.Rows\[i\].Cells\[0\].Value = 0 + i;// TheTrayHandler.Axis\[i\].MaxSpeed;
            dataGridView1.Rows\[i\].Cells\[1\].Value = 10 + i;// TheTrayHandler.Axis\[i\].SpeedPercent;
            dataGridView1.Rows\[i\].Cells\[2\].Value = 20 + i;// TheTrayHandler.Axis\[i\].HighAccel;
        }
        dataGridView1.Refresh();
    }

    private void dataGridView1\_KeyPress(object sender, KeyPressEventArgs e)
    {
        int i = 0; i = i + 1;
    }

    private void dataGridView1\_KeyDown(object sender, KeyEventArgs e)
    {
        int i = 0; i = i + 1;
    }

    private void dataGridView1\_KeyUp(object sender, KeyEventArgs e)
    {
        int i = 0; i = i + 1;
    }

    private void dataGridView1\_CellValueChanged(object sender, DataGridViewCellEventArgs e)
    {
        int i = 0; i = i + 1;
    }
}

}

So many years of programming I have forgotten more languages than I know.

[Lost User]

keypress event in Datagridview[^]

[michaelbarb]

Thanks. I needed to add the following to pass the event up:

    private void dataGridView1\_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e)
    {
        e.Control.KeyPress += new KeyPressEventHandler(dataGridView1\_KeyPress);
    }

So many years of programming I have forgotten more languages than I know.

[michaelbarb]

Now how do I do it when I put it in a custom control.

   protected override void OnKeyPress(KeyPressEventArgs e)
    {
        // Key checking
        base.OnKeyPress(e);
    }

    protected override void OnEditingControlShowing(DataGridViewEditingControlShowingEventArgs e)
    {
        e.Control.KeyPress += new KeyPressEventHandler(OnKeyPress);
        base.OnEditingControlShowing(e);
    }

I get an error on the OnKeyPress in setting the event handler: No overload for 'OnKeyPress' matches delegate in 'KeyPressEventHandler'

So many years of programming I have forgotten more languages than I know.

[Richard Deeming]

Simple:

protected override void OnKeyPress(KeyPressEventArgs e)
{
base.OnKeyPress(e);
HandleKeyPress(this, e);
}

protected override void OnEditingControlShowing(DataGridViewEditingControlShowingEventArgs e)
{
base.OnEditingControlShowing(e);
e.Control.KeyPress += HandleKeyPress;
}

protected virtual void HandleKeyPress(object sender, KeyPressEventArgs e)
{
// Key checking...
}

---

"These people looked deep within my soul and assigned me a number based on the order in which I joined." - Homer

[michaelbarb]

Beautiful, Thank you. The event OnKeyPress never gets used.

So many years of programming I have forgotten more languages than I know.

[Lost User]

The documentation is quite clear: KeyPressEventHandler Delegate (System.Windows.Forms) | Microsoft Docs[^]

[michaelbarb]

It is clear if you can find it by guessing the right search que. Thanks again.

So many years of programming I have forgotten more languages than I know.

[Lost User]

You can see the keyword KeyPressEventArgs in your code, so that should be a starting point.