实现窗口随鼠标移动而移动

private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
{
if (!moveFlag && e.Clicks >= 1)
moveFlag = true;
x = e.X;
y = e.Y;
base.OnMouseDown(e);
}

private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
{
if (moveFlag && (e.Button == MouseButtons.Left))
this.SetBounds(Left + e.X - x, Top + e.Y - y, this.Width, this.Height);
base.OnMouseMove(e);
}

private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
{
if (moveFlag)
moveFlag = false;
base.OnMouseUp(e);
}