Non-generic pattern match

gistfile1.cs

public override IEnumerable<IComponentRegistration> GetComponentRegistrations(ITreeNode registrationRootElement)
{
    IStructuralMatchResult match = Match(registrationRootElement);

    if (match.Matched)
    {
        // ReSharper SSR will match a generic method with this pattern too. If has generic arguments, return
        var invocationExpression = match.MatchedElement as IInvocationExpression;
        if (invocationExpression == null || invocationExpression.TypeArguments.Count > 0)
        {
            yield break;
        }

        var fromTypeArgument = match.GetMatchedElement("fromType") as ICSharpArgument;
        var toTypeArgument = match.GetMatchedElement("toType") as ICSharpArgument;
        if (fromTypeArgument == null || toTypeArgument == null)
        {
            yield break;
        }

        var fromTypeOf = fromTypeArgument.Value as ITypeofExpression;
        var toTypeOf = toTypeArgument.Value as ITypeofExpression;
        if (fromTypeOf == null || toTypeOf == null)
        {
            yield break;
        }

        var fromType = fromTypeOf.ArgumentType as IDeclaredType;
        var toType = toTypeOf.ArgumentType as IDeclaredType;
        if (fromType == null || toType == null)
        {
            yield break;
        }

        var serviceTypeElement = fromType.GetTypeElement();
        var typeTypeElement = toType.GetTypeElement();
        if (serviceTypeElement == null || typeTypeElement == null)
        {
            yield break;
        }

        yield return new ComponentRegistration(registrationRootElement, serviceTypeElement)
        {
            Implementation = typeTypeElement
        };
    }
}