partial modifier is missing on CustomControl

[sam-wheat]

I am following these instructions to create a control library.

I added a Custom Control and the generated class looks like this:

public sealed class CustomControl1 : Control

which causes this error:

error CS0260: Missing partial modifier on declaration of type 'CustomControl1'; another partial declaration of this type exists

Other than Class1 which is supplied by default when the project is created, there are no other controls or classes in the project.

Adding the partial modifier allows the project to build.

Interesting to note: The error message does not appear in the VS Error List window. I had to go to compliler output window to find it. I don't recall ever getting an error in VS that does not show up in the error list window.

See also this question.

[jeromelaban]

Thanks for the report. This is an expected behavior, as all UIElement inheriting classes contain generated code which need the partial modified.

That being said, the template should contain the partial modifier by default. Let's track this in #10565.