Indeed, that's the reason.

Thanks your help!

Hello Michael,

Thank you for your feedback.

Here is a little more info regarding your findings:

1. Update 1 – before calling Clear method to your CellClass you have an UltraGridCell which value refers to an instance of CellClass, let’s call it MyCellClassInstance. After calling the Clear method you are setting to null one property of the MyCellClassInstance. This does not change the value of the UltraGridCell – it is still refers to MyCellClassInstance, nevertheless the last was changed internally. When you create a new CellClass instance, let’s call it CurrentCellClassInstance and set the UltraGridCell value to this new object you are actually changing the cell value. This is why it forces the grid to refresh.

2. Update 2 – the reason UltraGrid does not refresh here are absolutely the same. The value of the UltraGridCell is not changed. This is why I am explicitly call Refresh method of the row.

Please let me know if you have any additional questions.

Thanks Miko.

However, there is no issue with custom class <> grid cooperation, except when changing the cell.Value in the keydown event handler will change the cell.Text immediately to "", but not on the GUI (so no repaint happens), until I "force" it to refresh redraw, as hovering the mouse over, scrolling the grid, resize, etc.

Update 1

Btw, I found a workaround with the current implementation:

instead of
(_grid.ActiveCell.Value as CellClass).Clear();

using:
CellClass current = (CellClass)_grid.ActiveCell.Value;
current.Clear();
_grid.ActiveCell.Value = new CellClass(current);

will reflect on the GUI immediately.

Update2

I just went through your sample, and I found what you do:

this.ultraGrid.ActiveCell.Row.Refresh();

without this, your sample also does not refresh the GUI immediately, I tried.

So now there are 2 solutions, mine in Update1, and your one in Update2.
Regarless, I will consider to use IEditorDataFilter instead of "custom" converting in _gridSource_CellDataUpdating().

Thank you for your help.

Hi Milko,

Thanks for your help.

This is how grid is used:

class CellClass : IConvertible
{
    public String DisplayValue = "";
    public MyClass RealValue = null;

    public CellClass(String displayValue, MyClass realValue)
    {
        DisplayValue = displayValue;
        RealValue = realValue;
    }

    public SetValue(String displayValue)
    {
        RealValue = Parse(displayValue);
        DisplayValue = RealValue.AsString();
    }

    #region IConvertible Members
    public object ToType(Type conversionType, IFormatProvider provider)    {
        return Convert.ChangeType(DisplayValue, conversionType);
    }

    public TypeCode GetTypeCode()    {
        return TypeCode.Object;
    }

    public string ToString(IFormatProvider provider)    {
        return DisplayValue;
    }

    //rest of IConvertible just throw new NotImplementedException();
    #endregion


    internal void Clear()
    {
        DisplayValue = "";
        RealValue = null;
    }
}


void BuildGrid()
{
    _gridSource.Rows.Clear();
    _gridSource.Band.Columns.Clear();
    for (x = ....)
    {
        UltraDataColumn col = _gridSource.Band.Columns.Add(name[x], typeof(Object));
        UltraGridColumn gridCol = _grid.DisplayLayout.Bands[0].Columns[_grid.DisplayLayout.Bands[0].Columns.Count - 1];
        gridCol.Style = Infragistics.Win.UltraWinGrid.ColumnStyle.Edit;
    }
}

void LoadData()
{
    List<object> row = new List<object>();

    foreach (......)
    {
        row.Add(new CellClass ("", new MyClass(...)));
    }

    _gridSource.Rows.Add(row.ToArray());
}
   

The principal is that, we are storing own class in every cell of the grid (Object / CellClass), but displaying them as String.

When user edits cells, we are parsing the new String value, and converting it to CellClass.