以C＃形式收集控件

Question

I have a form in which there are some buttons. I'd like put their references in an array.Is it possible with a foreach ?

I want to do this:

    public Form1()
    {
        InitializeComponent();
        Button[] all = new Button[5];
        all[0] = button1;
        all[1] = button2;
        all[3] = button3;
        all[4] = button4;
    }

I've already tried

int i=0;
foreach (Button p in Form1)
{
    all[i]= p;
    i++;
}

But I can't use a foreach on a Form. The same thing if the buttons are in a panel.

What can I do to collect all buttons quickly? Thanks :)

Answer 1

You're looking for the Controls collection of your form or container, which contains every control directly in it.

Beware that this will also include non-Buttons; call .OfType<Button>() to filter.

So instead of the foreach you can initialize an array like this:

Button[] all = this.Controls.OfType<Button>().ToArray();

Answer 2

Every Control has a Controls property which is a ControlCollection . You can get all Button s on a Control (as a Form or a Panel ) like this:

foreach(var button in control.Controls.OfType<Button>())
{ ... }

But this will only give you the Button s that are contained directly by this control . If you want to get all Button s in your Form on all Panel s, GroupBox s etc, you need to recurse through the Controls like in this example:

public class Form1 : Form
{
    // ...

    private static IEnumerable<Button> GetAllButtons(Control control)
    {
        return control.Controls.OfType<Button>().Concat(control.Controls.OfType<Control>().SelectMany(GetAllButtons));
    }

    private void DoSomethingWithAllButtons()
    {
        foreach(var button in GetAllButtons(this))
        { // do something with button }
    }
}