internal override void AssertTagRulesViolation(NodeList rootNodeList) { rootNodeList.GetItems().ForEach(n => { var b1 = n as Block; if (b1 != null) { var found = rootNodeList.FindAll(o => { var b2 = o as Block; return(b2 != null && b1.BlockName == b2.BlockName); }); if (found != null && found.Count > 1) { throw new SyntaxException(Liquid.ResourceManager.GetString("BlockTagAlreadyDefinedException"), b1.BlockName); } } }); }