Question

C#为什么有些控件无法绑定事件？

比如我声明了个 vscrollEvent，但却无法绑定到TreeView上。是哪里出错了？另外如何给TreeView绑定scroll事件？

Answer 1

    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();

            this.myTreeView1.VScrollEvent += delegate
            {
                this.Text = "纵向滚动了！";
            };
        }

        private void button1_Click(object sender, EventArgs e)
        {
            this.Text = "";//清空便于对比
        }
    }

    public class MyTreeView : TreeView
    {
        public event EventHandler HScrollEvent;
        public event EventHandler VScrollEvent;

        protected override void WndProc(ref Message m)
        {
            Debug.Print(m.Msg.ToString());

            switch (m.Msg.ToString())
            {
                case "277":
                    if (this.VScrollEvent != null)
                        this.VScrollEvent(this, null);
                    break;
                case "你自己检测数字":
                    if (this.HScrollEvent != null)
                        this.HScrollEvent(this, null);
                    break;
                default:
                    break;
            }
            base.WndProc(ref m);
        }
    }