How to access resources from a dll class library in C#?

Question

.NET

Hello! I haven't been able to figure it out since last night. Created a WinFroms application, then added an empty resource file to the project. I added a picture to the resource file and I get the picture while the application is running like this:
pictureBox1.Image = Resource1.TestImage;
But if you create a class library, then ide does not see the Resource1.resx file. Tried like this:
global::library
but the ide shows that the project only has the "MyClass" class.
Why do I need it? I am writing a plugin-enabled program. From the plugin (dll), in addition to methods, images are also exported (to add buttons to the toolbar in the main program). I used to do this (in a plugin):

public Image SetToolBarIcon()
    {
      return Image.FromFile("image.jpg");
    }

But the problem is that the images must be in the same folder as the plugin, which is not convenient.
I read that there is a ResourceManager, but I'm not sure yet that this is what I need.
Still, the question is why it is impossible to access resources from the library with such a simple method?

Answer 1

or add the attribute InternalsVisibleToAttribute to the Library for the assembly .
or make the Resource1 resource class public, to do this, change the Custom Tool from ResXFileCodeGenerator to PublicResXFileCodeGenerator in the file properties.