[Mono-winforms-list] problems with DataGridView and DataTable binding

[Chris Toshok]

All aspects of DataGridView need a lot of work, not just the databinding
(although I disagree that it requires specialized logic for DataTable
binding.  check out the databinding stuff in DataGrid.cs as an example.)

DataGridView really isn't complete enough to use - Would DataGrid be
enough for your usage?

Chris

On Sun, 2007-02-25 at 19:04 -0500, Mark Traudt wrote:
> 
> The example below works with .NET but not with Mono
> (mono-1.2.3.2007023 on openSUSE 10.2).  I encountered the following
> issues when using Mono:
> 
> 1- I do not see any column headers when the form is first displayed.
> 
> 2- The view is not refreshed automatically when I add rows by clicking
> the button (I have to force a repaint).
> 
> 3- When I switch data sources, it does not seem to clear the column
> headers from the previous data source.  Instead, it seems to add the
> columns for my current data source.  So I end up with these column
> headers to the right that have no data associated with them.
> 
> 4- If I have more than one row, then the scrollbar at the bottom
> flickers.
> 
> I investigated the first problem in more detail.  In DataGridView.cs,
> the DataSource setter calls BindIList, which can only display column
> headers if the list is not empty.  I am not an expert in winforms, but
> it seems to me that this method needs specialized logic to bind
> DataTable values, in order to take advantage of the DataColumn
> metadata.
> 
> 
> using System;
> using System.Windows.Forms;
> using System.Drawing;
> using System.Data;
> 
> public class OneOffApp
> {
>   static void Main()
>   {
>     Application.Run( new OneOffForm() );
>   }
> }
> 
> public class OneOffForm : Form
> {
>   private DataTable dt1;
>   private DataTable dt2;
>   private DataGridView grid;
>   private Button button;
> 
>   public OneOffForm()
>   {
>     dt1 = new DataTable();
>     dt1.Columns.Add("Date", typeof(DateTime));
>     dt1.Columns.Add("Event", typeof(string));
> 
>     dt2 = new DataTable();
>     dt2.Columns.Add("Date2", typeof(DateTime));
>     dt2.Columns.Add("Event2", typeof(string));
> 
>     button = new Button();
>     button.FlatStyle = FlatStyle.System;
>     button.Click += new EventHandler(button_Click);
>     button.Location = new Point(8, 8);
>     button.Name = "Switch";
>     button.Text = "Switch";
>     Controls.Add(button);
> 
>     grid = new DataGridView();
>     grid.MultiSelect = true;
>     grid.RowHeadersVisible = false;
>     grid.AllowUserToAddRows = false;
>     grid.AllowUserToDeleteRows = false;
>     grid.AllowUserToResizeRows = false;
>     grid.ShowCellToolTips = false;
>     grid.RowTemplate.Height = 18;
>     grid.ReadOnly = true;
>     grid.Location = new Point(8, button.Height * 2);
>     grid.SelectionMode = DataGridViewSelectionMode.FullRowSelect;
>     grid.DataSource = dt1;
>     Controls.Add(grid);
> 
>     Show();
>   }
> 
>   private void button_Click(object sender, System.EventArgs e)
>   {
>     DataTable dt = (grid.DataSource == dt1)? dt2 : dt1;
> 
>     DataRow r = dt.NewRow();
>     r[0] = DateTime.Now;
>     r[1] = "Button.Click";
>     dt.Rows.Add(r);
> 
>     grid.DataSource = dt;
>   }
> }
> 
> 
> 
> 
> 
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