MaterialDesignInXAML/MaterialDesignInXamlToolkit · error · Exception

Removed all nodes

Error message

Removed all nodes

What it means

IconThing is a maintenance/source-generation utility in MaterialDesignToolkit.ResourceGeneration, not shipped runtime code. UpdateEnum loads PackIconKind.template.cs and uses Roslyn RemoveNodes to strip the existing enum members before re-adding them from downloaded icon data. RemoveNodes can return null when the structural removal yields no node, and the `?? throw new Exception("Removed all nodes")` guards that. The message indicates the template file is malformed/empty or its tree does not match the expected namespace>enum shape.

Source

Thrown at src/MaterialDesignToolkit.ResourceGeneration/IconThing.cs:133

        var syntaxTree = CSharpSyntaxTree.ParseText(sourceText);

        var mySyntaxRewriter = new IconDataFactorySyntaxRewriter(icons);
        var node = mySyntaxRewriter.Visit(syntaxTree.GetRoot());

        return node.ToString();
    }

    private static string UpdateEnum(string sourceFile, IEnumerable<Icon> icons)
    {
        var sourceText = SourceText.From(new FileStream(sourceFile, FileMode.Open));
        var syntaxTree = CSharpSyntaxTree.ParseText(sourceText);

        var rootNode = syntaxTree.GetRoot();
        var namespaceDeclarationNode = rootNode.ChildNodes().Single();
        var enumDeclarationSyntaxNode = namespaceDeclarationNode.ChildNodes().OfType<EnumDeclarationSyntax>().Single();

        var emptyEnumDeclarationSyntaxNode = enumDeclarationSyntaxNode.RemoveNodes(enumDeclarationSyntaxNode.ChildNodes().OfType<EnumMemberDeclarationSyntax>(), SyntaxRemoveOptions.KeepDirectives)
            ?? throw new Exception("Removed all nodes");

        var leadingTriviaList = SyntaxTriviaList.Create(SyntaxFactory.Whitespace("        "));
        var enumMemberDeclarationSyntaxs = icons.SelectMany(GetEnumMemberDeclarations).ToArray();
        var generatedEnumDeclarationSyntax = emptyEnumDeclarationSyntaxNode.AddMembers(enumMemberDeclarationSyntaxs);

        generatedEnumDeclarationSyntax = AddLineFeedsToCommas(generatedEnumDeclarationSyntax);

        var generatedNamespaceDeclarationSyntaxNode = namespaceDeclarationNode.ReplaceNode(enumDeclarationSyntaxNode, generatedEnumDeclarationSyntax);
        var generatedRootNode = rootNode.ReplaceNode(namespaceDeclarationNode, generatedNamespaceDeclarationSyntaxNode);

        return generatedRootNode.ToFullString();

        IEnumerable<EnumMemberDeclarationSyntax> GetEnumMemberDeclarations(Icon icon)
        {
            var emptyAttributes = new SyntaxList<AttributeListSyntax>();
            SyntaxToken iconIdentifierToken = SyntaxFactory.Identifier(leadingTriviaList, icon.Name, SyntaxTriviaList.Empty);

            yield return SyntaxFactory.EnumMemberDeclaration(iconIdentifierToken);

View on GitHub (pinned to 98edec3a0b)

Solutions

1. Restore PackIconKind.template.cs to its committed state; it must contain the PackIconKind enum declaration.
2. Verify the template's top node is a namespace containing an enum declaration before running the generator.
3. Run the generator from the repo root so the 'PackIconKind.template.cs' relative path resolves correctly.

if (!enumDeclarationSyntaxNode.ChildNodes().OfType<EnumMemberDeclarationSyntax>().Any()
    && !icons.Any())
    throw new InvalidOperationException("Template has no enum members and no icons to add.");

try { return UpdateEnum(templatePath, icons); }
catch (Exception ex) when (ex.Message == "Removed all nodes")
{ /* restore template from source control and re-run */ }

When it happens

Trigger: Running the icon-generation tool against a PackIconKind.template.cs that has no enum members, or whose syntax tree does not match the expected namespace > EnumDeclaration shape so RemoveNodes returns null.

Common situations: Editing the template by hand, switching Roslyn/Microsoft.CodeAnalysis versions, or running the generator from the wrong working directory so the relative path resolves to the wrong file.

Related errors

• kinds must contain at least one value

AI-assisted analysis of MaterialDesignInXAML/MaterialDesignInXamlToolkit@98edec3a0b (2026-08-13). Data as JSON: /api/errors/2cfe59014bbfa17d. Report an issue: GitHub.