设计师无法显示此文件，因为没有在其内的类可以被设计 [英] The designer could not be shown for this file because none of the classes within it can be designed

问题描述

我们有以下共享组件：

public class OurServiceBase : System.ServiceProcess.ServiceBase

本类有我们希望在我们的所有下游业务，如标准化的执行调度和日志记录功能功能。

This class has functionality we want in all our downstream services, such as standardized execution scheduling and logging functionality.

在一个新的项目，我添加以下内容：

In a new project, I add the following:

public class MyService : System.ServiceProcess.ServiceBase

在Windows的设计，类显示正常。

In the Windows Designer, the class shows properly.

当我更改服务从OurServiceBase派生

When I change the service to derive from OurServiceBase

public class MyService : OurSharedLibrary.OurServiceBase

设计者停止工作：

完整的错误是：
设计者不能显示此文件，因为没有在其内的类可以被设计。设计者检查下列类文件中：EmailProcessor ​​---基类的OurSharedLibrary.CienaServiceBase无法加载。确保装配时已被引用，并且所有项目已建成。

The full 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 classes in the file: EmailProcessor --- The base class 'OurSharedLibrary.CienaServiceBase' could not be loaded. Ensure the assembly has been referenced and that all projects have been built.

适当的组件引用，生成项目。我不明白为什么，因为我的服务最终也从可设计类派生的设计师翻转出过这一点。

The proper assemblies are referenced, the project builds. I don't understand why the designer is flipping out over this since my service ultimately does derive from a designable class.

任何建议将是最欢迎的。

Any suggestions would be most welcome.

位的详细信息 - 从当它呈现有关无法设计出衍生服务错误的设计者调用堆栈：

Bit more information - the call stack from the designer when it renders the error about not being able to design the derived service:

at System.ComponentModel.Design.Serialization.CodeDomDesignerLoader.EnsureDocument(IDesignerSerializationManager manager)
at System.ComponentModel.Design.Serialization.CodeDomDesignerLoader.PerformLoad(IDesignerSerializationManager manager)
at Microsoft.VisualStudio.Design.Serialization.CodeDom.VSCodeDomDesignerLoader.PerformLoad(IDesignerSerializationManager serializationManager)
at System.ComponentModel.Design.Serialization.BasicDesignerLoader.BeginLoad(IDesignerLoaderHost host) 

2011/7/19下午2时34 EDT新发现。

7/19/2011 2:34PM EDT New discovery.

班OurServiceBase存在于一个单独的项目（通常为DLL只引用）。一时兴起，我复制了基础类文件到我的项目，建成，并开通了设计师。有效！当我再次删除基类文件，并返回给外部DLL参考，设计师再次爆发。

Class "OurServiceBase" exists in a separate project (usually referenced as a DLL only). On a whim, I copied the base class file into my project, built, and opened the designer. It worked! When I removed the base class file again and returned to the external DLL reference, the designer broke again.

推荐答案

您最好的选择将是开始使用版本 OurServiceBase 的无功能的，看看你是否可以设计为MyService 。如果是这样，那么，直到它打破慢慢加回功能。

Your best bet would be to start with a version of OurServiceBase with no functionality and see if you can design MyService. If so, then slowly add back functionality until it breaks.

，因为它看起来像Visual Studio是有序列 OurServiceBase的成员之一的一个问题。

Since it looks like Visual Studio is having a problem serializing one of the members of OurServiceBase.

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