c# - Linq to XML 持有关系

Question

我有这种结构的 XML 文档：

<dipOrders>
    <interchangeInfo senderEdiCode="LSC58" senderEdiCodeQal="ZZ" receiverEdiCode="15274" receiverEdiCodeQal="ZZ" syntax="X12" syntaxId="X" syntaxVersion="003010"/>
    <order orderNumber="219299" orderDate="2012-12-05T00:00:00" validityDate="2012-12-05T00:00:00">
        <buyer name="LEAR MTO">
            <partyCode buyerCode="811567924"/>
        </buyer>
        <supplier name="BRIDGE OF WEIR LEATHER CO">
            <partyCode buyerCode="749630"/>
        </supplier>
        <orderConsignee name="LEAR MEXICAN SEATING CORP">
            <partyCode buyerCode="LSC59"/>
            <orderLine description="LEA DC 378 HERO 6RSB 5B8" orderNumber="246767" engineeringChangeNumber="N">
                <partyCode buyerCode="DC378105H6RSB5B8AA"/>
                <cumulativeQuantity date="2012-12-04T00:00:00" quantity="0"/>
                <orderQuantity quantity="0" commitmentLevel="Firm" timingQualifier="Weekly" shipDate="2012-12-05T00:00:00"/>
            </orderLine>
            <orderLine description="LEA DC 378 HERO 6RSB 5V0" orderNumber="246767" engineeringChangeNumber="N">
                <partyCode buyerCode="DC378105H6RSB5V0AA"/>
                <cumulativeQuantity date="2012-12-04T00:00:00" quantity="0"/>
                <orderQuantity quantity="0" commitmentLevel="Firm" timingQualifier="Weekly" shipDate="2012-12-05T00:00:00"/>
                <orderQuantity quantity="600" commitmentLevel="Firm" timingQualifier="Weekly" shipDate="2012-12-06T00:00:00"/>
            </orderLine>

这是我访问 orderLine 项目属性的方式：

List<int> orderNumbers = doc.Descendants("orderLine").Select(x => int)x.Attribute("orderNumber")).ToList();
List<string> descriptions = doc.Descendants("orderLine").Select(x => (string)x.Attribute("description")).ToList();
List<string> buyerCodes = doc.Descendants("orderLine").Select(x => (string)x.Element("partyCode").Attribute("buyerCode")).ToList(); 

但是，orderLine 可以有不同数量的 orderQuantity 节点。如何在 Linq 语句中解决它以获得 orderLine 和 orderQuantity 之间的适当关系？

Answer 1

尝试SelectMany在下一个示例中使用 like

var r = doc.Descendants("orderLine")
           .SelectMany(node => node.Elements("orderQuantity")
                                   .Select(el => new {OrderNumber = (int)node.Attribute("orderNumber"), Quantity = (int)el.Attribute("quantity")}));

现在您有一个匿名对象序列，指示订单号和相应的数量，例如：

246767 0 
246767 600 

Answer 2

您可以使用此获取 orderQuantity 元素

var data = doc.Descendants("orderLine").
               Descendants("orderQuantity")
             .Select(x =>   new {paernt = x.Parent, x}).ToList();

也这样做

var data = doc.Descendants("orderLine").
               Descendants("orderQuantity")
             .Select(x =>   new {OrderNumber= (int) x.Parent.Attribute("orderNumber"), 
                                                                      x}).ToList();