I am trying to add a key event handler to a Datagridview.

I have added this (below) to my code:L

private void DgvDb_KeyUp(object sender, KeyEventArgs e)
{
    colI = DgvDb.CurrentCell.ColumnIndex;
    if (colI < 3 | colI == 12 | colI == 13 | colI == 15 | colI == 16 | colI == 17 | colI == 18 | colI == 19 | colI == 20 | colI == 21 | colI == 22)
    {
        vlue = Convert.ToString(DgvDb[colI, rowI - 1].Value);
        DgvDb[colI, rowI].Value = vlue;
    }
}

It shows "0 references" and in the code there is a redline under DgvDB saying it "does not exist in the current context". In the rest of the program, DgvDB is recognized.

I looked at similar code elsewhere in my application and looked at a reference in the XXX.Designer.cs.

I added to my designer under //DgvDB

this.DgvDB.KeyUp  = new System.Windows.Forms.KeyEventHandler(this.DgvDB_KeyUp);

Here, DgvDB_KeyUp is redlined saying does not contain a definition for DgvDB_KeyUp.

CodePudding user response：

I'm sure you wanted to writeif (colI < 3 || colI == 12 || colI == 13 || .....

CodePudding user response：

Double check if the event is tied to the datagridview and thats all:

You should see 1 reference.

Please notice,do not modify the designer since it can be automatically changed.

CodePudding user response：

You could instead have an array of column names and test against them rather than indices.

public partial class Form1 : Form
{

    /// <summary>
    /// Add each column name for logic in DgvDBOnKeyUp
    /// </summary>
    private readonly string[] _columns = new[]
    {
        "Column1", "Column2", "Column3", "Column12",
    };
    public Form1()
    {
        InitializeComponent();


        Shown  = OnShown;
    }

    private void OnShown(object? sender, EventArgs e)
    {
        DgvDB.KeyUp  = DgvDBOnKeyUp;
    }

    private void DgvDBOnKeyUp(object? sender, KeyEventArgs e)
    {
        if (_columns.Contains(DgvDB.CurrentCell.OwningColumn.Name))
        {
            // do your task
        }
    }
}