我想用C#写了段动态添加可移动控件的代码但是添加上了不能移动，代码如下

Question

 private void button3_Click(object sender, EventArgs e)
        {
            PictureBox pic = new PictureBox();
            pic.Left = 100;
            pic.Top = 20;
            pic.Image = Image.FromFile("../Images/button_albums.png");
            pic.Parent = this;
            pic.Location = new Point(10,10); //显示位置
            this.Controls.Add(pic);
//添加事件
            pic.MouseDown += new MouseEventHandler(button1_MouseDown);
           pic.MouseDown += new MouseEventHandler(button1_MouseDown);//运行的时候pic不能移动
           pictureBox1.MouseDown += new MouseEventHandler(button1_MouseDown);//pictureBox1可以移动
           pictureBox1.MouseMove += new MouseEventHandler(button1_MouseMove);
                   }

Answer 1

是，我是想用鼠标拖动
直接添加的pictureBox1控件可以
用代码添加的pic不可以 我想知道原因

Answer 2

 private void Form1_Load(object sender, EventArgs e)
        {
            PictureBox pic = new PictureBox();
            pic.Left = 100;
            pic.Top = 20;
            pic.Width = 100;
            pic.Height = 100;
            pic.BackColor = Color.Black;
            // pic.Image = Image.FromFile("../Images/button_albums.png");
            pic.Parent = this;
            pic.Location = new Point(10, 10); //显示位置
            //添加事件
            pic.MouseDown += new MouseEventHandler(pic_MouseDown);
            pic.MouseMove += new MouseEventHandler(pic_MouseMove);
            pic.MouseUp += new MouseEventHandler(pic_MouseUp);//运行的时候pic不能移动
            this.Controls.Add(pic);
}#region modify panel move&close
        private Point ptMouseCurrrnetPos, ptMouseNewPos, ptFormPos, ptFormNewPos;
        private bool blnMouseDown = false;        private void pic_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                blnMouseDown = true;
                //Save window position and mouse position
                ptMouseCurrrnetPos = Control.MousePosition;
                ptFormPos = (sender as Control).Location;
            }
        }        private void pic_MouseMove(object sender, MouseEventArgs e)
        {
            if (blnMouseDown)
            {
                //Get the current position of the mouse in the screen
                ptMouseNewPos = Control.MousePosition;
                //Set window position
                ptFormNewPos.X = ptMouseNewPos.X - ptMouseCurrrnetPos.X + ptFormPos.X;
                ptFormNewPos.Y = ptMouseNewPos.Y - ptMouseCurrrnetPos.Y + ptFormPos.Y;
                //Save window position
                (sender as Control).Location = ptFormNewPos;
                ptFormPos = ptFormNewPos;
                //Save mouse position
                ptMouseCurrrnetPos = ptMouseNewPos;
            }
        }        private void pic_MouseUp(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
                //Return back signal
                blnMouseDown = false;
        }
        #endregion