Question

I have a WPF Panel (like Canvas for example) and I want to remove its Children only if these children are of type T, for example all of type Button.

How can I do this? Can I use LINQ?

Answer 1

You can use LINQ, this is one way of doing.

canvas1.Children.OfType<Button>().ToList().ForEach(b => canvas1.Children.Remove(b));

OR you can loop though all the Child elements and if it is button add them to a list and finally remove them. don’t remove buttons inside foreach loop.

List<Button> toRemove = new List<Button>();
foreach (var o in canvas1.Children)
{
    if (o is Button)
        toRemove.Add((Button)o);
}
for (int i = 0; i < toRemove.Count; i++)
{
    canvas1.Children.Remove(toRemove[i]);
}

LINQ way is more readable and simple and less coding.