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POThe designer could not be shown for this file because none of the classes within it can be designed
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copied!<p>We have the following shared component:</p> <pre><code>public class OurServiceBase : System.ServiceProcess.ServiceBase </code></pre> <p>This class has functionality we want in all our downstream services, such as standardized execution scheduling and logging functionality.</p> <p>In a new project, I add the following:</p> <pre><code>public class MyService : System.ServiceProcess.ServiceBase </code></pre> <p>In the Windows Designer, the class shows properly.</p> <p>When I change the service to derive from OurServiceBase</p> <pre><code>public class MyService : OurSharedLibrary.OurServiceBase </code></pre> <p>The designer stops working:</p> <p><img src="https://i.stack.imgur.com/SUw9m.jpg" alt="Error screenshot"></p> <p>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. </p> <p>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.</p> <p>Any suggestions would be most welcome.</p> <p>Bit more information - the call stack from the designer when it renders the error about not being able to design the derived service:</p> <pre><code>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) </code></pre> <p>7/19/2011 2:34PM EDT New discovery. </p> <p>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.</p>

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