C#•2mo ago

✅ Roslyn: Get file scoped namespace

Hi, i'm using the new file scoped namespace

using System;

namespace TestNamespaceSpace;

public class TestClass 
{

}

using System;

namespace TestNamespaceSpace;

public class TestClass 
{

}

I try to extract the namespace like this

var root = syntaxTree.GetRoot();
var controllerClasses = root.DescendantNodes().OfType<ClassDeclarationSyntax>()
                            .Where(IsControllerClass);

var @namespace = root.DescendantNodesAndSelf().OfType<NamespaceDeclarationSyntax>().FirstOrDefault();

var root = syntaxTree.GetRoot();
var controllerClasses = root.DescendantNodes().OfType<ClassDeclarationSyntax>()
                            .Where(IsControllerClass);

var @namespace = root.DescendantNodesAndSelf().OfType<NamespaceDeclarationSyntax>().FirstOrDefault();

but @namespace is null. Why is that?

6 Replies

Pobiega•2mo ago

using namespace TestNameSpace;? is it really that, or did you just typo the using?

Davaaron•2mo ago

That was just a typo, sorry, but good catch But dammit, i found the issue 😄 they surprisingly added a new class for file-scoped namespaces... FileScopedNamespaceDeclarationSyntax

Marvin•2mo ago

Researhing a good method to get namespace for every situation, i came across a method like this, maybe it helps in the future too

C#
public static string GetNamespace(
    BaseTypeDeclarationSyntax syntax) {

    string nameSpace = string.Empty;
    SyntaxNode? potentialNamespaceParent = syntax.Parent;

    while(potentialNamespaceParent is not null
        and not NamespaceDeclarationSyntax
        and not FileScopedNamespaceDeclarationSyntax) {

        potentialNamespaceParent = potentialNamespaceParent.Parent;

    }

    if(potentialNamespaceParent is BaseNamespaceDeclarationSyntax namespaceParent) {

        nameSpace = namespaceParent.Name.ToString();

        while(namespaceParent.Parent is NamespaceDeclarationSyntax parent) {

            nameSpace = $"{namespaceParent.Name}.{nameSpace}";
            namespaceParent = parent;

        }

    }

    return nameSpace;

}

C#
public static string GetNamespace(
    BaseTypeDeclarationSyntax syntax) {

    string nameSpace = string.Empty;
    SyntaxNode? potentialNamespaceParent = syntax.Parent;

    while(potentialNamespaceParent is not null
        and not NamespaceDeclarationSyntax
        and not FileScopedNamespaceDeclarationSyntax) {

        potentialNamespaceParent = potentialNamespaceParent.Parent;

    }

    if(potentialNamespaceParent is BaseNamespaceDeclarationSyntax namespaceParent) {

        nameSpace = namespaceParent.Name.ToString();

        while(namespaceParent.Parent is NamespaceDeclarationSyntax parent) {

            nameSpace = $"{namespaceParent.Name}.{nameSpace}";
            namespaceParent = parent;

        }

    }

    return nameSpace;

}

Davaaron•2mo ago

Thanks for sharing your code! 🙂 That's what i was planning to do right now, like traversing the parents, because I figured out the file scoped namespace syntax is not a sibling of the class declaration syntax, but a parent.. that's kinda wild 😄 but it also makes sense logically your code seems to fit my needs, thanks 🙂

Unknown User•2mo ago

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MODiX•2mo ago

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✅ Roslyn: Get file scoped namespace