C#•15mo ago

✔ Simple code structure question

Let's say I have interface "IShapes" in file Shapes.cs Now, I'd like to create 3 more classes. Circle, square, and triangle. Should I create 3 more files for each class or rather put them all under the Shapes.cs file?

4 Replies

Angius•15mo ago

That's the convention, yes One class per file, file named like the class (or interface, or enum, or record... you get the idea) So IShape.cs, Circle.cs, Square.cs and Triangle.cs in your case That contain, respectively, interface IShape, class Circle, class Square and class Triangle

Graphics in 2013OP•15mo ago

What is the point of namespaces then? From what I've learnt, they are used to group classes together (though my notion of namespaces might be wrong, I'd be delighted to know what their real use is)

Angius•15mo ago

Yes, that is the use of a namespace And namespaces usually follow the folder structure So in a

MyApp
|— Services
|  |— ShapeService.cs
|  |— UserService.cs
|  \— BlogpostService.cs
|— Models
|  |— Shape.cs
|  |— User.cs
|  \— Blogpost.cs
\— Program.cs

MyApp
|— Services
|  |— ShapeService.cs
|  |— UserService.cs
|  \— BlogpostService.cs
|— Models
|  |— Shape.cs
|  |— User.cs
|  \— Blogpost.cs
\— Program.cs

you would have

namespace MyApp.Services;
public class ShapeService {}

namespace MyApp.Services;
public class ShapeService {}

namespace MyApp.Services;
public class UserService {}

namespace MyApp.Services;
public class UserService {}

namespace MyApp.Services;
public class BlogpostService {}

namespace MyApp.Services;
public class BlogpostService {}

namespace MyApp.Models;
public class Shape {}

namespace MyApp.Models;
public class Shape {}

namespace MyApp.Models;
public class User {}

namespace MyApp.Models;
public class User {}

namespace MyApp.Models;
public class Blogpost {}

namespace MyApp.Models;
public class Blogpost {}

namespace MyApp;
public class Program {}

namespace MyApp;
public class Program {}

Graphics in 2013OP•15mo ago

Ah, well, I thought that namespaces could only apply to one class, thank you for clearing that up!

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✔ Simple code structure question