public override void VisitDelegateDeclaration(DelegateDeclarationSyntax node)
        {
            var returnType  = node.ChildNodes().FirstOrDefault().ToString();
            var isSubMethod = node.ChildNodes().FirstOrDefault().ChildTokens().Any(x => x.Kind() == SyntaxKind.VoidKeyword);
            var isPartial   = node.ChildTokens().Any(x => x.Kind() == SyntaxKind.PartialKeyword);
            var defineName  = node.ChildTokens().FirstOrDefault(x => x.Kind() == SyntaxKind.IdentifierToken).ToString();

            // ジェネリック型を定義している場合
            if (node.ChildNodes().OfType <TypeParameterListSyntax>().Any())
            {
                var listNode     = node.ChildNodes().OfType <TypeParameterListSyntax>().FirstOrDefault();
                var genericTypes = listNode
                                   .ChildNodes()
                                   .OfType <TypeParameterSyntax>()
                                   .Select(x => x.ChildTokens().FirstOrDefault(y => y.Kind() == SyntaxKind.IdentifierToken).ToString());

                defineName = $"{defineName}<{string.Join(", ", genericTypes)}>";
            }

            var methodArguments = new List <MethodArgument>();

            if (node.ChildNodes().OfType <ParameterListSyntax>().FirstOrDefault().ChildNodes().Any())
            {
                var listNode = node.ChildNodes().OfType <ParameterListSyntax>().FirstOrDefault();
                methodArguments = GetMethodArguments(listNode);
            }

            var startLength     = node.Span.Start;
            var endLength       = node.Span.End;
            var parentNamespace = GetNamespace(DefineKinds.Delegate, startLength, endLength);

            UserDefinitions.Add(new UserDefinition
            {
                DefineKinds     = DefineKinds.Delegate,
                IsPartial       = isPartial,
                Namespace       = parentNamespace,
                DefineName      = defineName,
                DefineFullName  = $"{parentNamespace}.{defineName}",
                MethodArguments = methodArguments,
                ReturnType      = RemoveNamespace(returnType),
                SourceFile      = SourceFile,
                StartLength     = startLength,
                EndLength       = endLength,
            });

            base.VisitDelegateDeclaration(node);
        }