本文介绍了一种使用鼠标滚轮来调整PictureBox中显示图片大小的方法。通过监听MouseWheel事件并根据滚轮方向增加或减少缩放比例，实现了图片的平滑缩放效果。
用鼠标滚轮改变pictureBox中图片的大小
//用委托
private void Form_Load(object sender, EventArgs e)
{
MouseWheel += Panel_MouseWheel;
}
private void Panel_MouseWheel(object sender, MouseEventArgs e)
{
if (_myZoom < 0.05) return;
//判断滚轮的方向
if (e.Delta > 0)
_myZoom += 0.05;
else
_myZoom -= 0.05;
printPreviewControl1.Zoom = _myZoom;
}
//用委托
private void Form_Load(object sender, EventArgs e)
{
MouseWheel += Panel_MouseWheel;
}
private void Panel_MouseWheel(object sender, MouseEventArgs e)
{
if (_myZoom < 0.05) return;
//判断滚轮的方向
if (e.Delta > 0)
_myZoom += 0.05;
else
_myZoom -= 0.05;
printPreviewControl1.Zoom = _myZoom;
}
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