WinForm利用Recursive找出Controls

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

using System.Collections;

namespace WindowsApplication1
{
    public partial class Form1:Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender , EventArgs e)
        {
            ArrayList aryLst = FindControls(typeof(TextBox));
            MessageBox.Show(aryLst.Count.ToString());
        }

         public ArrayList FindControls(Type type)
        {
            ArrayList list = new ArrayList();
            foreach(Control c in this.Controls)
            {
                if(c.GetType() == type)
                    list.Add(c);
                else
                    FindControlsRecursive(c, type, ref list);
            }
            return list;
        }
        
        private static void FindControlsRecursive(Control root, Type type, ref ArrayList list)
        {
            if(root.Controls.Count != 0)
            {
                foreach(Control c in root.Controls)
                {
                    if(c.GetType() == type)
                        list.Add(c);
                    else if (c.HasChildren)
                        FindControlsRecursive(c, type, ref list);
                }
            }
        }


    }
    
}