ObjectListView Check subitem programmatically

Question

How can I check a sub item of an ObjectListView programmatically? CheckObject() and CheckObjects() work only with root items, not with sub items.

I tried to check it with the CheckSubItem() method, but it doesn't work. I also tried to load the children first and check them with Items[x].Checked = true.

Example Code:

    public void ReloadChecks(List<ExampleClass> toCheck)
    {
        List<ExampleClass> allProperties = 
        tvTreeView.Objects.Cast<ExampleClass>().ToList();

        tvTreeView.CheckObjects(toCheck.Where(x => x.Parent == null));

        foreach (ExampleClass subitem in toCheck.Where(x => x.Parent != null))
        {

            tvTreeView.CheckSubItem(subitem, tvTreeView.AllColumns[0]);

        }
}

ExampleClass has a list of objects as children and an object as parent. Both attributes are nullable. The TreeView has an single columnheader: Checkbox | Name

Answer 1

I think there's a misunderstanding of "sub-items" going on here.

From your code, it seems you are dealing with a TreeListView. Rows that are presented when you unroll a top-level object are "children" -- not "sub-items".

For a ListView, "sub-items" are all the cells on a row except cell 0 (Microsoft's terminology, not mine).

So, this code successfully checks the top level objects:

tvTreeView.CheckObjects(toCheck.Where(x => x.Parent == null));

The following code does nothing since it tried to check a sub-item on the only item that cannot be sub-item (i.e. column 0):

tvTreeView.CheckSubItem(subitem, tvTreeView.AllColumns[0]);

To check all the children, but not the top level objects, you would just use CheckObjects() again:

tvTreeView.CheckObjects(toCheck.Where(x => x.Parent != null));

CheckObjects() works on any object in the control, not just top-level objects.