如何在flowLayoutPanel C＃中删除控件范围

Question

I am new to C# and I am using windows forms.

I have flowLayoutPanel and I added 6 buttons statically to it and then at the run-time I add some more buttons .

Now without clicking on any button (buttons in flowLayoutPanel) I want to remove a range of buttons (the ones which were created at run-time) based on their location / index. For example: I already added 6 buttons statically and then at run-time I added 10 more buttons (16 buttons in total), now for example I want to remove buttons between the 8th and 12th. I think there might be an index for each control in the flowLayoutPanel and if I know the index of the buttons that would be helpful.

private void RemoveSomeButtons_Click(object sender, EventArgs e)
{
    //Remove buttons between the 8th and 12th
}

Anyone knows how to do that?
Thank you

Answer 1

You need to index these controls yourself, create a list to store your statically added buttons:

static List<Button> myButtonsList;

void InitializeButtons() {
    for (int i = 0; i <= 6; i++) {
        Button b = new Button();
        flowLayout.Controls.Add(b);
        myButtonsList.Add(b);
    }
}

And then add each button created at runtime to that list, now you have an index, assigned to each button

void CreateButtonAtRuntime() {
    Button b = new Button();
    flowLayout.Controls.Add(b);
    myButtonsList.Add(b);
}

void DeleteButtons(int fromInd, int toInd) {
    for (int i = toInd; i >= fromInd; i--) {
        Button b = myButtonsList[i];
        flowLayout.Controls.Remove(b);
        myButtonsList.RemoveAt(i);
    }
}

Answer 2

Remove controls based on their index

private void RemoveControls(FlowLayoutPanel panel, int first, int last)
{
    for (int i = first; i <= last; i++)
        panel.Controls.RemoveAt(first);
}