inherits

• オーバーライド

using System;
using System.Windows.Forms;
using System.Drawing;

namespace WindowsFormsApplication1
{
    public partial class frmMain : Form
    {
        public frmMain()
        {
            InitializeComponent();
            this.Controls.Add(new ExTextBox());
        }

        public class ExTextBox : TextBox
        {
            public ExTextBox()
            {
                this.Text = "わお";
            }

            /// <summary>
            /// プロパティの非表示
            /// </summary>
            public new Boolean ReadOnly
            {
                get
                {
                    return base.ReadOnly;
                }
                set
                {
                    base.ReadOnly = value;
                    if (value)
                    {
                        this.BackColor = Color.FromArgb(255, 255, 200);
                    }
                    else
                    {
                        this.BackColor = Color.FromArgb(255, 255, 255);
                    }
                }
            }

            /// <summary>
            /// メソッドのオーバーライド
            /// </summary>
            /// <param name="e"></param>
            protected override void OnClick(EventArgs e)
            {
                MessageBox.Show("WOW");
                base.OnClick(e);
            }
        }
    }
}

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