C# lambda foreach

List<XmlNode> xmlItemList

Dictionary<string, int> itemQtyDic = new Dictionary<string, int>();

xmlItemList.ForEach(x =>

            {

                if (!string.IsNullOrEmpty(x[quantityName]?.InnerText))

                    itemQtyDic.Add(x[XML_ITEM_LINENUMBER].InnerText + "|" + x[BSP_FIELD_CUSTOMER_NUMBER].InnerText

                    , Convert.ToInt32(x[quantityName].InnerText));

            });

xmlItemList is a List which is XMlNode, we need to check x[quantityName] whether is null, if not, we need to add key and value to a dictionary.