英文:
Visual Studio 2022 gives error "'Site' must not be null in order to access a required service." when trying to add menu item
问题
我有一个 contextMenuStrip，经常（不总是，但我还没有注意到可重复的模式）在尝试在“Type Here”字段中键入时出现错误对话框：
> 必须不为 null 以访问所需的服务。
当我点击光标进入字段时，它会立即发生。
有人知道是什么原因吗？
英文:
I've got a contextMenuStrip and often (not always, but I haven't noticed a repeatable pattern yet) I get the error dialog:
> 'Site' must not be null in order to access a required service.
when trying to type in the "Type Here" field. It happens the second I click the cursor into the field.
Anyone have any idea what's causing this?
答案1
得分: 1
以下是翻译好的部分：
这让问题对我来说不再存在。我不知道是哪个步骤解决了问题，但现在似乎正常工作了。
首先，设计师所做的只是为您编写[FormName].Designer.cs页面。您可以自己添加子项的条目，VS似乎对此没有问题。我开始做这个，看了一个以前的项目，该项目拥有菜单子项（在VS22中完美工作），作为一个模型。
- 在您的设计文件底部的对象定义中，添加菜单项的声明。
- 在隐藏部分，在实例化中，添加一行或多行以创建您的菜单项。
- 此时我注意到较旧的、正常工作的项目中，所有的实例化都以
this为前缀（即this.LogFileToolStripMenuItem=new ToolStripMenuItem），对于需要子菜单项的第二个菜单项，我添加了this，然后重新进入设计师，一切都正常工作了（而且继续如此，没有错误消息）。我不知道这其中哪一部分解决了问题，但当我回到设计文件查看如果删除了this会发生什么时，设计师编辑器已经自动去掉了this，但一切仍然正常。 - 您需要为工具栏菜单项设置三个属性。您可能可以复制其中一个现有的菜单项，然后根据您的新
toolstripmenuitem进行更改。 - 您需要做的最后一件事是将子菜单添加到父菜单中。在父菜单的属性定义部分，添加一个
AddRange行：
cmsLogging.DropDownItems.AddRange(new ToolStripItem[] { cmsLogging_LogFile, cmsLogging_ShowLogFile, cmsLogging_ShowLogFileDirectory });
在此之后，重新启动表单设计器，菜单项就会出现，一切都看起来正常。作为奖励，错误消息也消失了。这对我有效。
英文:
This made the problem go away for me. I do not know which step did it, but it seems to be working normally now.
First, all the designer does is write the [FormName].Designer.cs page for you. You can always put the entries in for the subitems in yourself and VS seems to be fine with that. I started this, looking at an older project that had menu subitems (and worked perfectly in VS22) as a model.
- In the object definitions at the bottom of your Designer file, add the declaration for the menu item(s).
- In the hidden section, in the instantiations, add a line(s) to create your menu item(s).
- It was at this point I noticed the older, working project all the instantiations were prefixed with
this(i.e.this.LogFileToolStripMenuItem=new ToolStripMenuItem) and on a second menu item that needed submenu items I added thethisand went back into the designer and everything worked normally (and continued to do so, no error message) from there on out. I don't know which part of this fixed it but when I went back into the designer file to see what happened if I removed thethisthe designer editor had already stripped thethisout, but everything still worked. - You need to set the three properties for a tool strip Menu Item. You can probably copy one of the existing ones and just change things to fit your new
toolstripmenuitem. - The last thing you need to do is add the submenus to the parent. In the property definition section for the parent, add an
AddRangeline:
cmsLogging.DropDownItems.AddRange(new ToolStripItem[] { cmsLogging_LogFile, cmsLogging_ShowLogFile, cmsLogging_ShowLogFileDirectory });
After this and restarting the form designer the menu items were present and everything looked normal. As a bonus the error message is gone away. It worked for me.
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