c#在设计时调试自定义 Windows 窗体控件参考链接在设计时调试自定义控件 - Windows Forms .NET Framework | Microsoft Learnhttps://learn.microsoft.com/zh-cn/dotnet/desktop/winforms/controls/walkthrough-debugging-custom-windows-forms-controls-at-design-time?view=netframeworkdesktop-4.8