无法在C＃的派生类中访问基类属性

Question

Here is my base class

public class AttachmentBase
{
    public AttachmentBase ();

    public string[] Content { get; set; }
    public string FileExtension { get; set; }
    public string FileName { get; set; }
    public long Id { get; set; }
}

and here is my derived class

public class Attachment:AttachmentBase
{
    public string Title { get; set; }
    public string Description { get; set; }
}

and here is how I instantiate new attachment in mvc controller

var attachmnet = new Attachment();

but when i want to access the FileExtension or other property that are in base class I dont have access to them. Everything is public but I do not have access to them.

I should say the base class in in another dll but I have added the reference to project.

What is problem that i cant access base class property in derived class?

Answer 1

If you simply create a base class and a derived class, there's no way you can have this issue. From what you said, it seems this happened because you created the base class in a project (= assembly = dll) and the derived one in another one, and instead of making this second project reference the first one, you made it reference a copy of a compiled dll. This way of course you won't get the changes of the first project in realtime.

When a project references another one, Visual Studio always recompiles everything that's needed.

Answer 2

Did Your check namespace? Because "AttachmentBase" class is under "System.Net.Main" namespace,and maybe you forget add correct project namespace that "AttachmentBase" is in it.

Answer 3

remove the reference to Attachment base dll in project , add it again , and rebuild solution .

i can see why c# cant be wise choose for productivity.