LINQ to XML 语法

Question

我有一个简单的 POCO 类来保存从 XML 文件中提取的数据，定义如下：

public class Demographics
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string MiddleName { get; set; }
    public string Gender { get; set; }
}

我有一个相当简单的 XML 文件（在这种情况下是元素）来提取数据，定义如下：

<patient determinerCode="INSTANCE">
    <name use="L">
        <given>John</given>
        <given qualifier="IN">Q.</given>
        <family>Public</family>
    </name>
    <administrativeGenderCode code="F" displayName="Female"/>   
</patient>

我面临的挑战是将中间名首字母和/或名字放入班级中的正确属性中。如您所见，name 节点内有两个 given 节点，中间的首字母由“IN”属性。是否有我在这里遗漏的简单 LINQ 语法，还是我需要查询所有给定节点并枚举它们以正确放置每个节点？

我目前的代码如下所示：

private string GetInterfaceXmlData(XElement source)
{
        //Source in this context represents the "patient" element as you see in the example.
        //The NMSPC constant represents the namespace for this XML document which is not specifically displayed
        //in the XML example.
        Demographics currentDemo = new Demographics()
        {
            //I realize that this particular reference to FirstName is not optimal, as it may not actually
            //be the first "given" node under the name node, it's simply a place holder for now.
            FirstName = source.Element(NMSPC + "name").Element(NMSPC + "given").Value,
            LastName = source.Element(NMSPC + "name").Element(NMSPC + "family").Value,
            Gender=source.Element(NMSPC+"administrativeGenderCode").Attribute("code").Value,
        };
        XElement result = new XElement("XML");
        result.Add(new XElement("Demographics"));
        return result.ToString();
}

Answer 1

怎么样：

// For the first name
source.Element(NMSPC + "name")
      .Elements(NMSPC + "given")
      .Where(element => element.Attribute("IN") == null)
      .First()

// For the initial
source.Element(NMSPC + "name")
      .Elements(NMSPC + "given")
      .Where(element => element.Attribute("IN") != null)
      .First()

编辑：这里的查询语法有点尴尬。对于第一个版本，它将是：

(from element in .Element(NMSPC + "name").Elements(NMSPC + "given")
where element.Attribute("IN") == null
select element).First()

我个人会坚持使用点符号。