简单继承在项目之间不起作用

Question

I just know I'm being an idiot, so somebody please tell me how.

Setup is simple:

1. Create a solution with three projects (.Net framework, class libraries) named InherTest , InherTest.Base , and InherTest.Base.Inherited

2. In InherTest.Base , add the following class:

   namespace InherTest.Base { public abstract class BaseClass { internal abstract string MEMBER_1 { get; } } }

3. Copy the exact same code into InherTest , including the namespace.

4. In InherTest.Base.Inherited , add the following class:

   namespace InherTest.Base.Inherited { public class Inherited : BaseClass { internal override string MEMBER_1 { get; } } }

5. Add a project reference in InherTest.Base.Inherited to InherTest.Base . Note the errors ("abstract member not implemented" and "no suitable member found to override").

6. Remove that reference and replace it with one to InherTest . Observe that the inheritance also fails .

Why don't they both work?

Edit: Originally I stated that one test would fail and the other would succeed; however, both inheritance attempts fail in the above scenario.

Answer 1

这是因为字符串是internal字符串，所以仅限于自己的项目

Answer 2

Why don't they both work?

They should both fail if they contain the same code as you claim. If that is not the case then the code is different between the 2 projects, specifically the MEMBER_1 is probably declared as public in InherTest project.

The only way that a reference to InherTest would work with the same code you posted is if you have this assembly level attribute InternalsVisibleToAttribute in the project InherTest

[assembly:InternalsVisibleTo("InherTest.Base.Inherited")]

Answer 3

Inherited Namespaces are in different project. (Name spaces seems like together but they are not in a same assembly). You can read that article.

https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/internal