Question

There are many questions concerning this issue here, but I have tried the solutions posted and still don’t get it to work.

I have a datagridview where I want to show the rownumber on the row headers.
This is what I have tried:

 gridView.RowHeadersWidthSizeMode = System.Windows.Forms.DataGridViewRowHeadersWidthSizeMode.AutoSizeToDisplayedHeaders;           
            gridView.AutoResizeRowHeadersWidth(
                DataGridViewRowHeadersWidthSizeMode.AutoSizeToAllHeaders);


            foreach (DataGridViewRow row in gridView.Rows)
            {
                row.HeaderCell.Value = (row.Index + 1).ToString();
            }

This code is called from the OnLoad event, since in other questions it is stated that the code should not be run in the constructor.

Advice? Thanks!

Answer 1

I think my approach would be to bind a row on the ItemDataBound event rather than going over the rows all a single place. Something along the lines of:

    /// <summary>
    /// Which row is currently being rendered
    /// </summary>
    protected int RowIndex { get; set; }

    protected override void OnLoad(EventArgs e)
    {      
      this.RowIndex = 0;
      this.DataGrid.DataSource = new string[] { "a", "b", "c" }; // bind the contents
      this.DataGrid.DataBind();      
    }

    /// <summary>
    /// When an item is bound
    /// </summary>
    protected void OnItemDataBound(object sender, DataGridItemEventArgs e)
    {
      this.RowIndex++;
      Label label = e.Item.FindControl("RowLabel") as Label;
      if (label != null)
      {
        label.Text = this.RowIndex.ToString();
      }
    }