C# 10 namespace and partial class files

[tomschrot]

I just discovered that writing a class with multiple source files as

public static partial class xxxx {}

do only require one single namespace xyz; - statement in just one of the partial source files!?

What is the recommended, correct way to write partial classes?

[CyrusNajmabadi]

do only require one single namespace xyz; - statement in just one of the partial source files!?

No. You will need the namespace in all of htem.

when you have:

File1.cs

namespace Foo;

public partial class C { }

This is defining a class Foo.C.

When you have:

File2.cs

public partial class C { }

It's just defining a class C in teh global namespace. As these are two different types, they are not combined at all into one single type.

[CyrusNajmabadi]

What is the recommended, correct way to write partial classes?

There is no recommended way. However, if you are going use them, then it needs to follow the rules of the language (for example, that all parts must be partial). Similarly, you can decide if you want to include things like base-types, or generic-constraints, on one, or some, or all of the parts.

[tomschrot]

Thank you!