C#•15mo ago

❔ Whats the difference between classes and public classes?

Tried looking at Microsoft docs earlier but the don't really answer the question. I already know what assess modifiers are, but how to do they affect classes?

23 Replies

x0rld•15mo ago

by default it's internal

Ronnie•15mo ago

mtreit•15mo ago

It effects whether other code can make use of the class. For instance, if you make a class library and publish it...and I consume that class library...my code can only use public classes In that library

Ronnie•15mo ago

so what if i had 2 different classes in 2 different files in the same project, can the normal class inherit from the public one

mtreit•15mo ago

Sure If the public class is not marked sealed

Ronnie•15mo ago

but what about assemblies? i dont know much about them

mtreit•15mo ago

The internal keyword restricts access to code in the same assembly

Ronnie•15mo ago

oh wait when using public classes from another assembly do you need to use refrences im not sure how to add one in visual studio

mtreit•15mo ago

Yes, you need some kind of reference to that assembly...usually a PackageReference for code from some third party or ProjectReference for code you own

Ronnie•15mo ago

oh ok do projects usually need multiple assemblies? because from what i know you cant use private/ private protected acsess modifiers within a namespace

mtreit•15mo ago

I'm not sure what that has to do with multiple assemblies

Ronnie•15mo ago

public classes can be assessed by different assemblies within the same solution, no?

Ronnie•15mo ago

mtreit•15mo ago

If there is a project reference

Ronnie•15mo ago

yeah i just made one now lol

Thinker•15mo ago

Just a note about terminology, a solution contains multiple projects, each project is one assembly, and each assembly contains multiple types (like classes)

Ronnie•15mo ago

im struggling to create a refrence from the program in assembly 1 to the other program in assembly 2 by any chance do you know how to do this im trying to use the public class within the program in assembly 1 in the program in assembly 2

using System;
using System.Collections.Generic;

namespace CSharp
{
    public class Foo
    {
        public void Method1()
        {
            Console.WriteLine("This comes from Program 1");
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine(" P1 Running.");
        }
    }
}

using System;
using System.Collections.Generic;

namespace CSharp
{
    public class Foo
    {
        public void Method1()
        {
            Console.WriteLine("This comes from Program 1");
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine(" P1 Running.");
        }
    }
}

^assembly#1

Thinker•15mo ago

Right click on the Dependencies in project 2, then add project reference (I think it's called that), then select project 1

Ronnie•15mo ago

ive done that but how do i use the public class in the program now?

Thinker•15mo ago

Add a using CSharp; at the top of your file

Ronnie•15mo ago

Ronnie•15mo ago

oo no errors yet hold on tho oml it worked all of this just to figure out how public classes work 😮‍💨

Accord•15mo ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ Whats the difference between classes and public classes?