C#•9mo ago

Help to import class.

Hi i'm a super noob and i need help. I had done my first console app with C#, so i wanna put my class in an external classfile and then import in my main. How to do it? I'm using visual studio community editions.

27 Replies

salty_pepper•9mo ago

using xxx.namesapce I think inside your main For this type of question, you can quickly ask chatGPT to create an example

CloudheartOP•9mo ago

I had tried but i failed, so this is why i' m asking here. I don't know how to make and where make a class file, set dependecy and how to import.

ZacharyPatten•9mo ago

you don't have to import class files. as long as your class file is included in the project you can access it. can you provide more info? perhaps a screenshot of your solution explorer?

ZacharyPatten•9mo ago

for example, here is what it might look like:

ZacharyPatten•9mo ago

in that screenshot there are two files: Program.cs and Class1.cs. Both files in in the ConsoleApp3 project Program.cs can see Class1 from Class1.cs. there is a using ConsoleApp3;, but that isn't actually required could have done ConsoleApp3.Class1 class1 = new(); instead of having using ConsoleApp3; at the top

CloudheartOP•9mo ago

Thanks, 🥹 How can i create the classfile and put it in the same solutions.

ZacharyPatten•9mo ago

a "solution" is a collection of "projects" a "project" is a collection of files that are all intended to be built together in order to add a class files to your project, just right click your project and select add and C# class

ZacharyPatten•9mo ago

or you could simply add a file in the directory of your project if you are using .NET (which you should be) then simply adding a xxx.cs file in the directory of your project will automatically be pulled into the build

CloudheartOP•9mo ago

Last question, my teacher had added the dipendancy, should i must do it?

ZacharyPatten•9mo ago

It isn't clear what you are asking. Can you rephrase?

CloudheartOP•9mo ago

My teacher set a dipendancy somewhere in this "process", if i don't do it will i get some errors?

ZacharyPatten•9mo ago

That isn't enough information for us to help you. You are mentioning that your teacher provided you a "dependency" but we need to know more about what your teacher provided you in order to help. Did your teacher provided you a Xxx.dll file? (a file ending in ".dll") Did your teacher provide you some C# code? In which case they probably just intend you to copy-paste the code into your own? What did your teacher provide you and what are you trying to make? feel free to share the instructions provided by your teacher (the assignment). we won't do your homework for you 😛 but that will help us guide you on what your teacher is intending for you to do

CloudheartOP•9mo ago

He right click on dipendancy and so something that i don't remember. I just skip ahead to much, maybe

Angius•9mo ago

Right-clicking on the dependencies in Visual Studio might lead to adding a dependency, yes We have no way of knowing what that dependency is, though Nor if it's really needed for your current project, or was it just your teacher showing you how to do it if need be

ZacharyPatten•9mo ago

derpendency :trollface:

CloudheartOP•9mo ago

if i Right click on dependencies and choose add project reference, i don't see my file class. Anyway the program works without any errors.

Angius•9mo ago

You don't add new classes via dependencies

ZacharyPatten•9mo ago

you don't have to add a reference to C# code files

Angius•9mo ago

So, yeah, no wonder you don't see it there

ZacharyPatten•9mo ago

references are for when you want one project to use code from another project

Angius•9mo ago

// Foo.cs
namespace MyApp;

public class Foo
{
}

// Foo.cs
namespace MyApp;

public class Foo
{
}

// Things/Baz.cs
namespace MyApp.Things;

public class Baz
{
}

// Things/Baz.cs
namespace MyApp.Things;

public class Baz
{
}

// Bar.cs
namespace MyApp;

using MyApp.Things;
// we need to import the namespace

public class Bar
{
    public Foo Thingamajig { get; set; }
    //      ^ same namespace, so no need to do anything special

    public Baz AnotherThingy { get; set; }
    //      ^ different namespace, so we need the `using`
}

// Bar.cs
namespace MyApp;

using MyApp.Things;
// we need to import the namespace

public class Bar
{
    public Foo Thingamajig { get; set; }
    //      ^ same namespace, so no need to do anything special

    public Baz AnotherThingy { get; set; }
    //      ^ different namespace, so we need the `using`
}

This is how multiple classes in multiple files work in a single project

ZacharyPatten•9mo ago

hmmm... im trying to upload an example.. but discord is failing to let me post screenshots at the monent..

CloudheartOP•9mo ago

Yes but i'm sure that he click on dependencies and set something. Anyway i'll check it in three days when i can see the lesson.

Angius•9mo ago

Sure, maybe he did add some dependency But we have no way of knowing what dependency it was

CloudheartOP•9mo ago

Really thanks for the help

ZacharyPatten•9mo ago

finally... damn discord is struggling today anyways... above is an image/example of when you would use a "referece" (aka a "dependency"). Class1 is in the ClassLibrary1 project, but if we want to use Class1 from the ConsoleApp3 project, because it is in a seperate project we have to add a reference to ClassLibrary1 from ConsoleApp3

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Help to import class.