使用linq查询XML并比较两个变量

Question

试图写一个选择，让我选择一个特定的办公室元素

这是我的XML

<?xml version="1.0"> 
<regions>
    <region>
        <office>
            <name>Office One</name>
        </office>

        <office>
            <name>Office Two</name>
        </office>
        <settings>
            <name>Main Regional Name</name>
        </settings>
    </region>
    <region>
        <office>
            <name>Office Three</name>
        </office>

        <office>
            <name>Office Four</name>
        </office>
        <settings>
            <name>Secondary Regional Name</name>
        </settings>
    </region>

这是我的代码

    Dim clfWizardXml As XElement
    Dim selectRegion = lstRegions.SelectedItem
    Dim selectOffice = lstOffices.SelectedItem


    Console.WriteLine(selectRegion + " " + selectOffice)


    Dim officeList As IEnumerable(Of XElement) = _
        From region In clfWizardXml.Elements("region"), _
             office In clfWizardXml.Elements("region").Elements("office") _
        Where region.Element("settings").Element("name").Value = selectRegion _
        And office.Element("name").Value = selectOffice
        Select office

我认为我的问题就在这里：和office.Element（“ name”）。Value = selectOffice

谢谢大家的帮助，问题是我在第二个区域的办公室级别错误。

Answer 1

看来您的问题是clfWizardXml.Elements("region")不返回任何内容，因为region不在文档的正下方。 相反，您需要clfWizardXml.Root.Elements("region")或clfWizardXml.Descendants("region") ：

Dim officeList As IEnumerable(Of XElement) = _
    From region In clfWizardXml.Root.Elements("region"), _
         office In clfWizardXml.Root.Elements("region").Elements("office") _
    Where region.Element("settings").Element("name").Value = selectRegion _
    And office.Element("name").Value = selectOffice
    Select office

另外，由于VB.NET支持XML文字，因此您可以使其看起来更好（无论如何对我来说，您可能会不同意）：

Dim officeList As IEnumerable(Of XElement) =
    From region In clfWizardXml...<region>,
         office In region.<office>
    Where region.<settings>.<name>.Value = selectRegion _
        AndAlso office.<name>.Value = selectOffice
    Select office