Lambda inside if statement?

Question

How can I use lambda inside an if statement to compare a treenode's value to an object value inside a list ? Currently I am trying something like this but it won't work. Is there any better way to simplify my search?

if (tvItems.Nodes.Count > 0)
{
    // Get checked items
    listChecked= MenuItemDTOManager.GetMenuItems();
    //

    foreach (TreeNode parentNode in tvItems.Nodes)
    {
        if (listChecked.Find(s => s.menuId.ToString() == parentNode.Value.ToString()))
        {
            parentNode.Checked = true;
        }
    }
    // Traverse children
}

Yes, you can since you are already showing a lambda inside an if statement. But what is it that you are trying to do? And what doesn't work? — Maarten
– Maarten, Commented Oct 30, 2012 at 7:56
That was not working since if returns bool & Find does not. However I have found the answer thanks to @Cuong Le — Zo Has
– Zo Has, Commented Oct 30, 2012 at 9:19

cuongle · Accepted Answer · 2012-10-30 08:18:21Z

4

Should be using Any instead of Find:

if (listChecked.Any(s => s.menuId.ToString() == parentNode.Value.ToString()))
{
    parentNode.Checked = true;
}

edited Oct 30, 2012 at 8:18

answered Oct 30, 2012 at 7:57

cuongle

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Comments

Azodious · Accepted Answer · 2012-10-30 08:00:48Z

2

if requires a bool value only.

listChecked.Find(s => s.menuId.ToString() == parentNode.Value.ToString())

Find won't return bool.

Try using Exists instead of Find.

answered Oct 30, 2012 at 8:00

Azodious

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Comments

Omar · Accepted Answer · 2012-10-30 08:01:15Z

1

Probably you are looking for the following.

foreach (TreeNode parentNode in tvItems.Nodes.OfType<TreeNode>().Any(n=> listChecked.Any(s => s.menuId.ToString() == n.Value.ToString()))
{
    parentNode.Checked = true;
}

edited Oct 30, 2012 at 8:01

Omar

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answered Oct 30, 2012 at 7:58

k0stya

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