#18 Duplicate items when setting ModelFilter

[Paul. F]

Hi Phillip, I found a possible issue, I have a list of objects which display fine on the grid, if I apply a model filter to the grid then a few items on the grid will appear twice, if I check the list size I can confirm that it contains the correct amount of items, but more items get rendered on the grid, if I remove the ModelFilter the grid keeps displaying double items.

Here's how I set the filter:

lstTasks.ModelFilter = new ModelFilter(delegate (object modelObject)
            {
                return VisibleObjectIds.Contains(((TaskObject)modelObject).Id);
            });

and how I clear it:

lnkClearFilter.Hide();

            lstTasks.ModelFilter = new ModelFilter(delegate (object modelObject)
            {
                return true;
            });

When I load the list initially it is perfect, the duplicates will appear only after appying a filter and won't go away after clearing it.

Thank you

[Paul. F]

In fact any filter duplicates some of the items, like this:

public class TestFilter : IModelFilter
        {
            public bool Filter(object modelObject)
            {
                return true;
            }
        }

[Phillip Piper]

What type of ObjectListView are you using?

On Thu., 20 Dec. 2018, 4:01 am Paul. F <paul-f@users.sourceforge.net wrote:

In fact any filter duplicates some of the items, like this:

public class TestFilter : IModelFilter
{
public bool Filter(object modelObject)
{
return true;
}
}

---

• [support-requests:#18]
  https://sourceforge.net/p/objectlistview/support-requests/18/ Duplicate
  items when setting ModelFilter*

Status: open
Group: v2.X
Created: Wed Dec 19, 2018 04:27 PM UTC by Paul. F
Last Updated: Wed Dec 19, 2018 04:27 PM UTC
Owner: Phillip Piper

Hi Phillip, I found a possible issue, I have a list of objects which
display fine on the grid, if I apply a model filter to the grid then a few
items on the grid will appear twice, if I check the list size I can confirm
that it contains the correct amount of items, but more items get rendered
on the grid, if I remove the ModelFilter the grid keeps displaying double
items.

Here's how I set the filter:

lstTasks.ModelFilter = new ModelFilter(delegate (object modelObject)
{
return VisibleObjectIds.Contains(((TaskObject)modelObject).Id);
});

and how I clear it:

lnkClearFilter.Hide();

        lstTasks.ModelFilter = new ModelFilter(delegate (object modelObject)
        {
            return true;
        });

When I load the list initially it is perfect, the duplicates will appear
only after appying a filter and won't go away after clearing it.

Thank you

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[Paul. F]

Hi Phillip, it's C# Winforms, I could confirm that applying just about any filter to the model filter will make some duplicate items appear while the collection size remains the same.

public class TestFilter : IModelFilter
        {
            public bool Filter(object modelObject)
            {
                return true;
            }
        }

private void btApplyModelFilter_Click(object sender, EventArgs e)
        {
            lstTasks.ModelFilter = new TestFilter();
        }        

My objects are very simple, contained in a List<taskobject>:</taskobject>

public class TaskObject
{
    public string Id { get; set; } //This is a guid
    public DateTime Date { get; set; }
    public string Description { get; set; }
}

[Paul. F]

Actually if I setup a clean test project I don't get the same problem so the issue must lie somewhere in my code.