Programmatically adding an object and selecting the correspondig row does not make it become the CurrentRow
- by Robert
I'm in a struggle with the DataGridView: I do have a BindingList of some simple objects that implement INotifyPropertyChanged. The DataGridView's datasource is set to this BindingList. Now I need to add an object to the list by hitting the "+" key. When an object is added, it should appear as a new row and it shall become the current row. As the CurrentRow-property is readonly, I iterate through all rows, check if its bound item is the newly created object, and if it is, I set this row to "Selected = true;"
The problem: although the new object and thereby a new row gets inserted and selected in the DataGridView, it still is not the CurrentRow! It does not become the CurrentRow unless I do a mouse click into this new row.
In this test program you can add new objects (and thereby rows) with the "+" key, and with the "i" key the data-bound object of the CurrentRow is shown in a MessageBox.
How can I make a newly added object become the CurrentObject? Thanks for your help!
Here's the sample:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
BindingList<item> myItems;
public Form1()
{
InitializeComponent();
myItems = new BindingList<item>();
for (int i = 1; i <= 10; i++)
{
myItems.Add(new item(i));
}
dataGridView1.DataSource = myItems;
}
public void Form1_KeyDown(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.Add)
{
addItem();
}
}
public void addItem()
{
item i = new item(myItems.Count + 1);
myItems.Add(i);
foreach (DataGridViewRow dr in dataGridView1.Rows)
{
if (dr.DataBoundItem == i)
{
dr.Selected = true;
}
}
}
private void btAdd_Click(object sender, EventArgs e)
{
addItem();
}
private void dataGridView1_KeyDown(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.Add)
{
addItem();
}
if (e.KeyCode == Keys.I)
{
MessageBox.Show(((item)dataGridView1.CurrentRow.DataBoundItem).title);
}
}
}
public class item : INotifyPropertyChanged
{
public event PropertyChangedEventHandler PropertyChanged;
private int _id;
public int id {
get
{
return _id;
}
set
{
this.title = "This is item number " + value.ToString();
_id = value;
InvokePropertyChanged(new PropertyChangedEventArgs("id"));
}
}
private string _title;
public string title {
get
{
return _title;
}
set
{
_title = value;
InvokePropertyChanged(new PropertyChangedEventArgs("title"));
}
}
public item(int id)
{
this.id = id;
}
#region Implementation of INotifyPropertyChanged
public void InvokePropertyChanged(PropertyChangedEventArgs e)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null) handler(this, e);
}
#endregion
}
}
