/// <summary>
/// Builds the filter expression and raises the FilterExpressionBuilding event
/// </summary>
/// <param name="sender">The event source.</param>
/// <param name="e">The <see cref="System.ComponentModel.CancelEventArgs"/> userPermissions containing the event data.</param>
/// <remarks>
/// Override <b>OnFilterExpressionBuilding</b> to provide a filter expression construction
/// logic and to set the values of the <see cref="DgvBaseColumnFilter.FilterExpression"/> and <see cref="DgvBaseColumnFilter.FilterCaption"/> properties.
/// The <see cref="DgvFilterManager"/> will use these properties in constructing the whole filter expression and to change the header text of the filtered column.
/// Otherwise, you can create an event handler and set the <i>Cancel</i> ctl of event argument to true, to skip standard filter expression building logic.
/// </remarks>
protected override void OnFilterExpressionBuilding(object sender, CancelEventArgs e)
{
base.OnFilterExpressionBuilding(sender, e);
if (e.Cancel)
{
FilterManager.RebuildFilter();
return;
}
FilterResult filterResult = new FilterResult();
filterResult.Caption = this.OriginalDataGridViewColumnHeaderText;
if (this.checkBoxSelectNull.Checked)
{
filterResult.Expression = GetNullCondition(this.DataGridViewColumn.DataPropertyName);
filterResult.Caption += "\n= Ø";
}
if (this._checkedItems.Count > 0)
{
if (!String.IsNullOrEmpty(filterResult.Expression))
{
filterResult.Expression += " OR ";
}
filterResult.Expression += this.DataGridViewColumn.DataPropertyName + " IN (";
}
Int32 i = 0;
foreach (String filter in this._checkedItems)
{
if (!String.IsNullOrEmpty(filter))
{
filterResult = this.ApplyFilter(filterResult, filter, i);
}
i++;
}
if (this._checkedItems.Count > 0)
{
filterResult.Expression += filterResult.Expression.Substring(0, filterResult.Expression.Length - 1) + ")";
}
if (i > this.MaxCaptionItems)
{
filterResult.Caption += "\n...";
}
if (!String.IsNullOrEmpty(filterResult.Expression))
{
FilterExpression = filterResult.Expression;
FilterCaption = filterResult.Caption;
FilterManager.RebuildFilter();
}
else
{
FilterManager.ActivateFilter(false, this.DataGridViewColumn.Index);
}
}
private void tsOK_Click(object sender, EventArgs e)
{
FilterManager.ActivateFilter(true);
this.Popup.Close();
}
private void tsRemove_Click(object sender, EventArgs e)
{
FilterManager.ActivateFilter(false);
this.Popup.Close();
}
private void lblDelete_Click(object sender, EventArgs e)
{
FilterManager.ActivateFilter(false);
Popup.Close();
}