c# - 我怎样才能使组框只有外线没有背景

Question

我在表格上有图纸，组框将它们隐藏起来。它还可以防止激活表单的单击事件。所以我尝试用 alpha 元素设置背景颜色完全透明，然后我可以看到画作，但事件仍然不起作用。是否有可能组框根本没有填充，只有一条外线？

Answer 1

i think you are trying to draw on the form and want to have inside the boundaries of a groupbox, you should try to draw on groupbox instead of form.

Graphics groupBox = groupBox1.CreateGraphics(); //Graphics for GroupBox