C# picturebox 问题

Question

可以自己加入Event handler，但是有 一点要注意MoveWheel只有在获得Focus的控件上才有效，picturebox通过鼠标很难获得focus，因此要想办法让它获得焦点，下面的代码是Hover的的时候调用pictruebox1.Focus()。 你可以找到适合你项目的方法。        public Form2()
        {
            InitializeComponent();
            pictureBox1.MouseWheel += pictureBox1_MouseWheel;
            pictureBox1.MouseHover += pictureBox1_MouseHover;
        }        void pictureBox1_MouseHover(object sender, EventArgs e)
        {
            pictureBox1.Focus();
        }        void pictureBox1_MouseWheel(object sender, MouseEventArgs e)
        {
            label1.Text = e.Delta.ToString();
        }

Answer 1

this.pictureBox1.MouseWheel += new MouseEventHandler(PictureBox1_MouseWheel);  //注册事件
private void PictureBox1_MouseDown(object sender, MouseEventArgs e)  
{   
    this.pictureBox1.Focus();  
}