我认为您正在尝试对窗口模式和全屏模式使用不同的布局.

I think you are trying to use different layouts for windowed and full screen mode.

切换到全屏模式时，您可以:

When you switch to full screen you can:

• 以编程方式更改 PictureBox 以 pictureBox.Dock = DockStyle.Fill
填写表单
• 打开另一个表单(全屏显示)，该表单仅包含填充该表单的 PictureBox

注意:如果您将Dock设置为除 DockStyle.None

Note: First method won't work as expected if you have other controls with Dock set to something else than DockStyle.None