private void HistoryView_GoUp(object sender, EventArgs e)
{
var query = _queryHistory.Current;
if (query == null)
{
return;
}
// build the parent folder query
IExecutableQuery nextQuery = null;
foreach (var pattern in query.Patterns)
{
var parentPattern = pattern.GetParent();
var parentQuery = _queryFactory.CreateQuery(parentPattern.Text);
if (nextQuery == null)
{
nextQuery = parentQuery;
}
else
{
nextQuery = _queryFactory.Union(parentQuery, nextQuery);
}
}
if (nextQuery == null)
{
return;
}
// execute it
_queryHistory.ExecuteQuery(nextQuery);
}