如何更改父窗体中子窗体控件的属性

Question

我有一个包含按钮和一些子窗体的 Mdiparent 窗体。单击父窗体中的按钮时，如何更改所有子窗体中所有文本框的背景色？

Answer 1

这个ChilForm;

        public ChilForm()
        {
            InitializeComponent();
        }

        public void ChangeTextboxColor() 
        {
            textBox1.BackColor = Color.Yellow;
        }

这是Parent；

        ChilForm frm = new ChilForm();

        public Parent()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            //Shows the child
            frm.Show();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            //Changes color
            frm.ChangeTextboxColor();
        }

Answer 2

我知道答案已经给出了..但我会参加活动和代表.. 多播委托是最好的选择在这里所以这是我的解决方案。

namespace winMultiCastDelegate
{
    public partial class Form1 : Form
    {
        public delegate void ChangeBackColorDelegate(Color backgroundColor);

        //just avoid null check  instanciate it with fake delegate.
        public event ChangeBackColorDelegate ChangeBackColor = delegate { };
        public Form1()
        {
            InitializeComponent();


            //instanciate child form for N time.. just to simulate
            for (int i = 0; i < 3; i++) 
            {
                var childForm = new ChildForm();
                //subscribe parent event
                this.ChangeBackColor += childForm.ChangeColor;
                //show every form
                childForm.Show();
            }

        }

        private void button1_Click(object sender, EventArgs e)
        {
            ChangeBackColor.Invoke(Color.Black);
        }
    }
    /// <summary>
    /// child form class having text box inside
    /// </summary>
    public class ChildForm : Form 
    {
        private TextBox textBox;
        public ChildForm() 
        {

            textBox = new TextBox();
            textBox.Width = 200;
            this.Controls.Add(textBox);
        }
        public void ChangeColor(Color color) 
        {
            textBox.BackColor = color;
        }
    }


}

如何更改父窗体中子窗体控件的属性

how to change properties of child form controls in parent form

c#

mdiparent

winforms

visual-studio-2012