blocks|key|641135|text|使用project+%2B+Add+Class将类添加到项目中，不要将它们放入窗体的源代码文件中。如果必须将它们添加到底部或嵌套在form类中，请不要将它们放在form类声明的前面。窗体类必须是第一个。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|641136|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Use Project + Add Class to add classes to your project, don't put them in the form's source code file. If you have to then add them to the bottom or nested inside the form class, don't put them ahead of the form class declaration. The form class must be first.

blocks|key|641270|text|我也遇到了同样的问题，为了解决这个问题，使用下面的命令运行程序，清除添加到VSPackages的所有跳过加载的选项：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|641271|"C:\Program+Files\Microsoft+Visual+Studio+8.0\Common7\IDE\devenv.exe"+/ResetSkipPkgs|code-block|syntax|javascript|641272|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I got the same problem, to solve it, run the program with this command to clear all of the options to skip loading added to VSPackages:

<pre><code>"C:\Program Files\Microsoft Visual Studio 8.0\Common7\IDE\devenv.exe" /ResetSkipPkgs
</code></pre>

blocks|key|641361|text|单击解决方案资源管理器顶部的"Show+All+Files“图标，您将看到Designer.vb文件|type|unstyled|depth|inlineStyleRanges|entityRanges|data|641362|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Click on "Show All Files" Icon at the top of the Solution Explorer, you will see the Designer.vb file

blocks|key|858933|text|当您在表单代码上时，单击View+>+Designer，它将显示出来。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|858934|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

While you are on the form code, click on View > Designer, and it will showup.

blocks|key|859179|text|在我的例子中，当我将表单放入名称空间，然后取出它时，问题就出现了。FrmXYZ.vb在项目文件中丢失了其正确的构建信息。为了修复它，我在解决方案资源管理器中右键单击项目，选择"unload"，然后选择"edit“。我按名字搜索我的表格。首先，我找到了一个关于FrmXYZ.Designer.vb的编译部分。如下所示：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|859180|<Compile+Include="Forms\FrmXYZ.Designer.vb">
+++<DependentUpon>FrmXYZ.vb</DependentUpon>
</Compile>|code-block|syntax|javascript|859181|这一切都很好。然后，下一节介绍表单文件FrmXYZ.vb。这是我的问题。它写道，|859182|<Compile+Include="Forms\FrmXYZ.vb"+/>|859183|我将其更改为以下内容，以使visual+studio知道它是一个表单：|859184|<Compile+Include="Forms\FrmXYZ.vb">
++<SubType>Form</SubType>
</Compile>|859185|然后我保存文件，关闭文件，右键单击项目，并选择“重新加载项目”。|859186|问题解决了(对我来说)。|859187|entityMap^0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|Y|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|10|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|11|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|T|$]]

In my case, the problem came about when I put the form into a namespace and then took it out. The FrmXYZ.vb lost its proper build information in the project file. To fix it, I right clicked on the project in the Solution Explorer, selected "unload", and then, "edit". I searched for my form by name. First, I found a compile section about FrmXYZ.Designer.vb. This looks like the following:

<pre><code>&lt;Compile Include="Forms\FrmXYZ.Designer.vb"&gt;
 &lt;DependentUpon&gt;FrmXYZ.vb&lt;/DependentUpon&gt;
&lt;/Compile&gt;
</code></pre>

This was all good. Then next section was for the form file, FrmXYZ.vb. This was my problem. It read,

<pre><code>&lt;Compile Include="Forms\FrmXYZ.vb" /&gt;
</code></pre>

I changed it to the following to make visual studio know it was a form:

<pre><code>&lt;Compile Include="Forms\FrmXYZ.vb"&gt;
 &lt;SubType&gt;Form&lt;/SubType&gt;
&lt;/Compile&gt;
</code></pre>

Then I saved the file, closed the file, right clicked on the project, and selected, "reload project".

Problem solved (for me).

blocks|key|858841|text|我也遇到过这样的情况，我在项目的解决方案中显示了xxx.Designer.vb、xxx.resx和xxx.vb。为了解决这个问题，我备份了我的解决方案/项目(非常非常重要)，然后删除了在我的项目的解决方案资源管理器中找到的3个xxx文件。然后，我从备份中选择并复制了3个xxx文件，并使用Windows资源管理器将它们粘贴到我的项目的文件夹中。(确保粘贴到的文件夹是解决方案中显示的文件夹。粘贴后，我返回到项目，然后到原始xxx文件所在的文件夹，右键单击该文件夹，然后单击Add+-+Existing+Item。然后只点击xxx.vb文件。已修复。希望这对你有用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|858842|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I too had a situation in which I had xxx.Designer.vb, xxx.resx, and xxx.vb showing in the Solution for my Project. To fix this, I backed up my Solution/Project (Very Very Important), then I deleted the 3 xxx files found in my Solution Explorer for my Project. I then selected and copied the 3 xxx files from my backup and pasted them using Windows Explorer into the folder for my project. (make sure the folder you paste to is the folder shown in your Solution. After the paste I went back into the Project, then to the folder where the original xxx files where located, right clicked on that folder and clicked on Add - Existing Item. Then clicked ONLY on the xxx.vb file. Fixed. Hope this works for you.

blocks|key|858613|text|通过这样做，我终于可以在设计器中查看表单了：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|858614|在我的form_designer.vb中|858615|现有代码：|858616|在我的项目中定义了Inherits+Base_Class的Base_Class|858617|更改为：|858618|继承窗体‘窗体由windows定义|858619|然后我就可以在设计器中查看窗体了！|858620|当然，我不能成功构建文件，因为继承是不正确的。但是我可以先在form_designer中编辑，然后改回‘继承Base_Class’，然后编译或编译|858621|entityMap^0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|S|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|T|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|U|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|V|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|W|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|X|8|@]|9|@]|A|$]]|$1|N|3|O|5|6|7|Y|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|Q|$]]

I finally can view form in designer by doing this:

In my form_designer.vb,

Exsiting code:

Inherits Base_Class 'Base_Class is defined in my project

Change to: 

Inherits Form 'Form is defined by windows

Then I can view form in designer!!!

Of course, I can not build files successfully since the inheritence is not correct. But I can first edit in form_designer, and then change back to 'Inherits Base_Class' and build or compile

blocks|key|858719|text|我也有同样的问题，尽管我的问题是因为我混淆了我的项目文件。经过去模糊和重建后，它似乎起作用了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|858720|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I had this same problem, although my problem was because I obfuscated my project file. After deobfuscation, and rebuilding, it seemed to work.

blocks|key|641493|text|如果您不能查看设计，只能查看代码，则关闭VS转到您的项目目录，找到其中的窗体，在任何文本编辑器中打开它，并在顶部添加类名称作为public例如|type|unstyled|depth|inlineStyleRanges|entityRanges|data|641494|Public+Class+FrmSettings

End+Class|code-block|syntax|javascript|641495|就是这样，现在您可以在VS设计中查看表单|641496|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

if you no can view the design but only the code, then
close VS go to your project directory, find the form in there, open it in any text editor and add the class name as public at the top for example

<pre><code>Public Class FrmSettings

End Class
</code></pre>

that's it, now you can view the form in VS design

blocks|key|641581|text|首先，我为我糟糕的英语道歉。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|641582|这对我很有效：|641583|如果您将一个空窗体添加到项目中，则可以在其上双击，您可以看到以下内容：|641584|Public+Class+Form1

Private+Sub+Form1_Load(ByVal+sender+As+System.Object,+ByVal+e+As+System.EventArgs)+Handles+MyBase.Load

End+Sub|code-block|syntax|javascript|641585|结束类|641586|你在另一个表单中看不到这些代码，可能是因为这个类被分解了(无法解释原因)。|641587|只需在类定义中更改窗体名称，即可恢复该类。然后，您可以看到设计器。|641588|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|U|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|V|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|W|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|Y|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

At first, I apologize for my bad english.

This worked for me:

If you add an empty form to your project, you can double clik on it, and you can see the following:

<pre><code>Public Class Form1

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

End Sub
</code></pre>

End Class

You can't see that code in the other form, probably because this class have disspeared (can't explain why)

Simply restore this class, changing the Form Name in class definition. Then, you can see the designer.

blocks|key|859068|text|这是一个老问题，(关于VS2010)，然而我在VS2017中也遇到了同样的问题，谷歌搜索将我带到了这里。如果你试图在没有经过升级/转换过程的情况下从一个较旧的VS打开一个项目，那么在VS+2017中也会发生这个问题。例如，如果您告诉VS+2017打开文件夹，而不是打开解决方案或项目。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|859069|我注意到，当它作为一个文件夹打开时，VS+2017试图合理地安排事情。你甚至可以运行这个程序(至少我可以，在这个例子中它是一个用VS2010编写的VB控制台应用程序)。我可以通过双击Form.VB文件来查看代码/代码视图，但是任何组合都不允许我查看表单设计器。解决方案是退出并作为现有解决方案重新打开。这导致了正确的转换步骤，现在我可以看到表单/表单设计器以及代码。也许这会对某人有帮助。|859070|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

This is an old question, (and about VS 2010), however I just had the same problem in VS 2017 and a Google search led me here.
This problem can also occur in VS 2017 if you try to open an project from an older VS without going through the upgrade/conversion process. For example, if you tell VS 2017 to open the Folder instead of opening a Solution or Project. 
I noticed when opening it as a Folder, VS 2017 tries to arrange things logically. You can even run the program (at least I could, in this case it was a VB console app written in VS 2010). I could see the Code / code view by double clicking the Form.VB file, but no combination would allow me to see the Form designer. The solution was to exit and re-open as an existing Solution. This led through the proper conversion steps and now I can see the Form / form designer as well as the code. Maybe this will help someone.

blocks|key|859103|text|如果在???Form.vb代码中有任何其他类，请确保在Form类之后定义它们。这为我解决了这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|859104|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

If you have ANY other classes in the ???Form.vb code, then make SURE they are defined AFTER the Form class. This solved the problem for me.

I use MS visual studio 2010. I did open designer and view the form for the same file A before. But after some small changes, I can no longer view the form designer.vb, but can only view code in designer.vb. Even if I go back to the original source, I still can not open designer!!

The error is:
The designer could not be shown for this file because none of the classes within it can be designed. The designer inspected the following clsses in the file A-The base class BaseClass could not be loaded. Ensure the assembly has been referenced and all that projects have been built.

I checked that the file A inherits from the BaseClass. The BaseClass has a simple form and can be viewed by designer. I have a successful build. Actually, I can run the program correctly. I even tried delete bin and objects then build, but nothing helps.

I have many files that can not be opened in designer.vb. This is killing me! How can I make changes to the form then? Directly write code to designer.vb? But many suggest that do not write code directly in designer.vb

Can not view the form designer in vb.net

Visual Studio

Windows

我使用的是MS visual studio 2010。我之前确实打开了designer并查看了相同文件A的窗体。但经过一些小的更改后，我不能再查看表单designer.vb，而只能查看designer.vb中的代码。即使我回到原来的源码，我仍然无法打开设计器！！错误是:无法显示此文件的设计器，因为其中的任何类都无法设计。设计器检查了文件A中的以下类-无法加载基类BaseClass。确保程序集已被引

问无法在vb.net中查看窗体设计器
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