Remove all controls in the flowlayout panel in C #

Question

I create a flow layout panel, each element of which represents a room. I want to reboot the entire room by deleting all the controls in the panel and adding new controls.

I used:

foreach(Control control in flowLayoutPanel.Controls) { flowLayoutPanel.Controls.Remove(control); control.Dispose(); } 

but some controls cannot be deleted.

I tried to find a solution on the Internet, but did not find it anywhere.

Did any body help?

Answer 1

This is because you are removing controls from the same list that you iterate. Try something like this

 List<Control> listControls = flowLayoutPanel.Controls.ToList(); foreach (Control control in listControls) { flowLayoutPanel.Controls.Remove(control); control.Dispose(); } 

Maybe not so, but you get the point. Get them in the list and then delete them.

Answer 2

According to MSDN, you can clear all ControlCollection controls (e.g. FlowLayoutPanel ) by calling the Clear() method . For instance:

 flowLayoutPanel1.Controls.Clear(); 

Know: just because items are removed from collections does not mean that handlers have disappeared and they need to be disposed of properly so that you do not encounter memory leaks.

Answer 3

Note: this is a working solution based on the previous comment, therefore loans to this person :)

This worked for me:

 List<Control> listControls = new List<Control>(); foreach (Control control in flowLayoutPanel1.Controls) { listControls.Add(control); } foreach (Control control in listControls) { flowLayoutPanel1.Controls.Remove(control); control.Dispose(); } 

This is probably a better / cleaner way to do this, but it works.

Answer 4

If you are looking for a simple and quick solution. Here it is.

 while (flowLayoutPanel.Controls.Count > 0) flowLayoutPanel.Controls.RemoveAt(0);