public override object EditValue(ITypeDescriptorContext context, IServiceProvider provider, object value)
{
if (provider != null && context != null)
{
IWindowsFormsEditorService service = (IWindowsFormsEditorService)provider.GetService(typeof(IWindowsFormsEditorService));
if (service == null || context.Instance == null)
{
return(value);
}
IDataGrid eg = context.Instance as IDataGrid;
DataGridViewColumnCollection cols;
if (eg != null)
{
DlgEditColumns dlgCols = new DlgEditColumns();
cols = value as DataGridViewColumnCollection;
if (cols == null)
{
cols = new DataGridViewColumnCollection((DataGridView)eg);
}
dlgCols.LoadData(cols);
eg.DisableColumnChangeNotification = true;
if (service.ShowDialog(dlgCols) == DialogResult.OK)
{
value = cols;
eg.OnChangeColumns(cols);
}
eg.DisableColumnChangeNotification = false;
}
{
IDesignerHost host = (IDesignerHost)provider.GetService(typeof(IDesignerHost));
if (host == null)
{
IComponent ic = context.Instance as IComponent;
if (ic != null && ic.Site != null)
{
host = ic.Site.GetService(typeof(IDesignerHost)) as IDesignerHost;
}
}
if (host == null)
{
return(value);
}
if (dataGridViewColumnCollectionDialog == null)
{
dataGridViewColumnCollectionDialog = CreateColumnCollectionDialog(provider, value as DataGridViewColumnCollection, context.Instance as DataGridView);
}
if (dataGridViewColumnCollectionDialog == null)
{
return(value);
}
//Unfortunately we had to make property which returns inner datagridview
//to access it here because we need to pass DataGridView into SetLiveDataGridView () method
DataGridView grid = context.Instance as DataGridView;
//we have to set Site property because it will be accessed inside SetLiveDataGridView () method
//and by default it's usually null, so if we do not set it here, we will get exception inside SetLiveDataGridView ()
//var oldSite = grid.Site;
//grid.Site = ((UserControl) context.Instance).Site;
//execute SetLiveDataGridView () via reflection
SetLiveDataGridView(dataGridViewColumnCollectionDialog, grid);
using (DesignerTransaction transaction = host.CreateTransaction("DataGridViewColumnCollectionTransaction"))
{
if (service.ShowDialog(dataGridViewColumnCollectionDialog) == DialogResult.OK)
{
transaction.Commit();
if (eg != null)
{
cols = value as DataGridViewColumnCollection;
eg.OnChangeColumns(cols);
IDevClass dc = eg.GetDevClass();
if (dc != null)
{
dc.NotifyChange(eg, context.PropertyDescriptor.Name);
}
}
}
else
{
transaction.Cancel();
}
}
}
}
return(value);
}