protected virtual void Filter(FilterDescriptorCollection descriptors)
{
FilterDescriptor[] currentDescriptors = descriptors.ToArray();
ExpressionNode node = ExpressionParser.Parse(descriptors.Expression, this.masterTemplate.CaseSensitive);
if (this.CurrentOperation != ItemSourceOperation.None || node == null || currentDescriptors.Length == 0)
{
this.view = this.dataSource;
this.CurrentOperation = ItemSourceOperation.None;
return;
}
this.CurrentOperation = ItemSourceOperation.Filtering;
List <object> newView = new List <object>();
IList filteredView = this.dataSource;
for (int i = 0; i < filteredView.Count; i++)
{
if (!this.perform)
{
this.CurrentOperation = ItemSourceOperation.None;
return;
}
object entry = filteredView[i];
ExpressionContext context = new ExpressionContext();
for (int j = 0; j < currentDescriptors.Length; j++)
{
string member = currentDescriptors[j].PropertyName;
if (!context.ContainsKey(member))
{
context.Add(member, this.GetValue(entry, member));
}
else
{
context[member] = this.GetValue(entry, member);
}
}
object evalResult = node.Eval(null, context);
if (evalResult is bool && (bool)evalResult)
{
newView.Add(entry);
}
}
this.view = newView;
this.CurrentOperation = ItemSourceOperation.None;
}
