本文介绍了ContextMenuStrip的SourceControl DropDownItem返回null的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我在WinForm项目中使用ContextMenuStrip。我在设计时添加了两个项目 - 1.添加焦点和2.删除焦点。在运行时，我在添加焦点项中添加了几个下拉项。问题是，我在尝试检索源控件名称时变为null。这是我的代码
I am using a ContextMenuStrip in a WinForm project. I have added two item in it at design time- 1. Add Focus and 2. Remove Focus. In runtime, i am adding few dropdown items in "Add Focus" item. Problem is, i am getting null when trying to retrieve source control name. Here is my code
ToolStripDropDownItem dropDownItem = sender as ToolStripDropDownItem;
ToolStripMenuItem mainItem = dropDownItem.OwnerItem as ToolStripMenuItem;
ContextMenuStrip contextMenuStrip = mainItem.Owner as ContextMenuStrip;
Control control =contextMenuStrip.SourceControl; //getting null here
这段代码有什么问题？
问候
SKPaul
What is the problem in this code?
Regards
SKPaul
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