https://bugzilla.novell.com/show_bug.cgi?id=325979
Summary: NullReferenceException when looking up cell in
DataGridViewCellCollection by column name
Product: Mono: Class Libraries
Version: unspecified
Platform: x86
OS/Version: openSUSE 10.2
Status: NEW
Severity: Normal
Priority: P5 - None
Component: Windows.Forms
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
QAContact: [EMAIL PROTECTED]
Found By: ---
If I populate a DataTable and then set it as the DataSource for a DataGridView,
and then attempt to lookup a cell in a DataGridViewCellCollection by column
name, I get a NullReferenceException. This works fine with MS .NET.
I did some investigation and believe that the problem is that the OwningColumn
property of each DataGridViewCell is not being set when the DataTable is bound
to the DataGridView.
The following code sample can be used to reproduce:
using System;
using System.ComponentModel;
using System.Windows.Forms;
using System.Drawing;
using System.Data;
public class SampleProgram
{
static void Main()
{
Application.Run( new TestForm() );
}
}
public class TestForm : Form
{
private DataGridView grid;
private IContainer components;
private ContextMenuStrip contextMenuStrip;
private ToolStripMenuItem editMenuItem;
public TestForm()
{
DataTable dt = new DataTable();
dt.Columns.Add("Date", typeof(DateTime));
dt.Columns.Add("Event", typeof(string));
DataRow row;
row = dt.NewRow();
row["Date"] = DateTime.Now;
row["Event"] = "one";
dt.Rows.Add(row);
row = dt.NewRow();
row["Date"] = DateTime.Now;
row["Event"] = "two";
dt.Rows.Add(row);
components = new Container();
editMenuItem = new ToolStripMenuItem();
editMenuItem.Enabled = false;
editMenuItem.Name = "editMenuItem";
editMenuItem.Size = new Size(162, 22);
editMenuItem.Click += new EventHandler(this.editMenuItem_Click);
editMenuItem.Text = "&Edit";
contextMenuStrip = new ContextMenuStrip(this.components);
contextMenuStrip.Items.AddRange(new ToolStripItem[] { this.editMenuItem }
);
contextMenuStrip.Name = "contextMenuStrip";
contextMenuStrip.Size = new Size(163, 170);
contextMenuStrip.Opening += new
CancelEventHandler(this.contextMenuStrip_Opening);
contextMenuStrip.ShowImageMargin = false;
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(0, 0);
grid.SelectionMode = DataGridViewSelectionMode.FullRowSelect;
grid.ContextMenuStrip = this.contextMenuStrip;
grid.DataSource = dt;
Controls.Add(grid);
Show();
}
private void editMenuItem_Click(object sender, EventArgs e)
{
if (grid.SelectedRows.Count > 0)
{
DataGridViewCellCollection cells = grid.SelectedRows[0].Cells;
MessageBox.Show( String.Format("{0}", cells["Event"].Value));
}
}
private void contextMenuStrip_Opening(object sender, CancelEventArgs e)
{
editMenuItem.Enabled = (grid.SelectedRows.Count > 0)? true: false;
}
}
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