How to identify if a loop contains a logging statement in a Roslyn Analyser

Question

I'm trying to teach myself to write Roslyn Analyzers (using VS 2022).

I have a piece od sample code I'm playing with;

     Dictionary<string, string> GetVessels(Dictionary<string, string> dicta, Dictionary<string, string> dictb)
    {
        Dictionary<string, string> dictc = new Dictionary<string, string>();

        foreach(KeyValuePair<string, string> kvp in dicta)
        {
            Log.Verbose(kvp.Key, kvp.Value);
            if(!dictc.ContainsKey(kvp.Key))
                dictc.Add(kvp.Key, kvp.Value);
        }
        foreach(KeyValuePair<string, string> kvp in dictb)
        {
            if(!dictc.ContainsKey(kvp.Key))
                dictc.Add(kvp.Key, kvp.Value);
        }
        return dictc;
    }

This is really just pseudo code but the idea is that I want the Analyzer to identify foreach loops that don't have a logging statement.

In the analyzer itself I'm reasonably certain that I ought to be looking for ForEachStatements so I have the following in the Initialize method;

  context.RegisterSyntaxNodeAction(AnalyzeNode, SyntaxKind.ForEachStatement);

Now what I'd really like to know is whether my approach to identify the presence of a logging statement in the AnalyzeNode method is correct?

    private void AnalyzeNode(SyntaxNodeAnalysisContext context)
    {
        var foreachDeclaration = (ForEachStatementSyntax)context.Node;
        var invocationExpression = (InvocationExpressionSyntax)context.Node;
        if(foreachDeclaration.Contains(invocationExpression))
            if (invocationExpression.Expression.ToString() == "Log.Verbose")
            {
                return;
            } else
            {
                var diagnostic = Diagnostic.Create(Rule, foreachDeclaration.GetLocation());
                context.ReportDiagnostic(diagnostic);
            }
    }

I realise I have still to I have still to identify the semantic model of the node so the avove code clearly has flaws but first and foremost is this the correct approach to determine whether a foreach loop contains a particular statement?