DataGridViewCellValueEventArgs Class
Assembly: System.Windows.Forms (in system.windows.forms.dll)
Handle the CellValueNeeded and CellValuePushed events to implement virtual mode in the DataGridView control. For more information about virtual mode, see Virtual Mode in the Windows Forms DataGridView Control.
For more information about handling events, see Consuming Events.
The following code example handles the CellValuePushed event to store updates and new entries in a data store object. This example is part of a larger example available in the DataGridView.VirtualMode reference topic.
#region "data store maintance" const int initialValue = -1; private void dataGridView1_CellValueNeeded(object sender, DataGridViewCellValueEventArgs e) { if (store.ContainsKey(e.RowIndex)) { // Use the store if the e value has been modified // and stored. e.Value = store[e.RowIndex]; } else if (newRowNeeded && e.RowIndex == numberOfRows) { if (dataGridView1.IsCurrentCellInEditMode) { e.Value = initialValue; } else { // Show a blank value if the cursor is just resting // on the last row. e.Value = String.Empty; } } else { e.Value = e.RowIndex; } } private void dataGridView1_CellValuePushed(object sender, DataGridViewCellValueEventArgs e) { store.Add(e.RowIndex, int.Parse(e.Value.ToString())); } #endregion private Dictionary<int, int> store = new Dictionary<int, int>();
#region "data store maintance"
private final int INITIALVALUE = -1;
private void dataGridView1_CellValueNeeded(Object sender,
DataGridViewCellValueEventArgs e)
{
if (store.ContainsKey(e.get_RowIndex())) {
// Use the store if the e value has been modified
// and stored.
e.set_Value((Int32)store.get_Item(e.get_RowIndex()));
}
else {
if (newRowNeeded && e.get_RowIndex() == numberOfRows) {
if (dataGridView1.get_IsCurrentCellInEditMode()) {
e.set_Value((Int32)INITIALVALUE);
}
else {
// Show a blank e if the cursor is just loitering
// over(the)
// last row.
e.set_Value("");
}
}
else {
e.set_Value((Int32)e.get_RowIndex());
}
}
} //dataGridView1_CellValueNeeded
private void dataGridView1_CellValuePushed(Object sender,
DataGridViewCellValueEventArgs e)
{
store.Add(e.get_RowIndex(), Int32.Parse(e.get_Value().ToString()));
} //dataGridView1_CellValuePushed
#endregion
private Dictionary<int, int> store = new Dictionary<int, int>();
Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.