XElement.Elements(XName)方法无法读取具有属性的xml节点

本文关键字：属性 节点 xml 读取 Elements XName 方法 XElement | 更新日期: 2023-09-27 18:00:34

我正在尝试使用Linq到Xml来过滤xmldata，问题是我无法使用XElement.elements（Xname）方法获取元素，但在使用XElement.Descendents（Xname）方法时，它工作正常，但显示了我不想要的所有元素。我想要的是，它应该显示所有元素和属性，它们的元素和属性名称在两个文本框中传递。

XML:

<?xml version="1.0" ?> 
<Summary AvailableRules="71000" SelectedRules="445" OmittedRules="6887">
  <BBCE AvailableRules="69" SelectedRules="4" OmittedRules="65">
    <SelectedRules>
      <Rule RuleID="jc_0201" Priority="Strongly Recommended" /> 
      <Rule RuleID="jc_0211" Priority="Strongly Recommended" /> 
      <Rule RuleID="jc_0221" Priority="Strongly Recommended" /> 
      <Rule RuleID="jc_0231" Priority="Strongly Recommended" /> 
    </SelectedRules>
    <OmittedRules>
      <Rule RuleID="ar_0001" Priority="Mandatory" /> 
      <Rule RuleID="ar_0002" Priority="Mandatory" /> 
      <Rule RuleID="db_0143_a" Priority="Strongly Recommended" /> 
      <Rule RuleID="db_0143_b" Priority="Strongly Recommended" /> 
      <Rule RuleID="jc_0311" Priority="Mandatory" /> 
      <Rule RuleID="jc_0321" Priority="Mandatory" /> 
      <Rule RuleID="jc_0331" Priority="Mandatory" /> 
      <Rule RuleID="jc_0341" Priority="Mandatory" /> 
      <Rule RuleID="jc_0011" Priority="Strongly Recommended" /> 
      <Rule RuleID="jc_0021" Priority="Strongly Recommended" /> 
      <Rule RuleID="na_0004_a" Priority="Recommended" /> 
      <Rule RuleID="na_0004_b" Priority="Recommended" /> 
      <Rule RuleID="db_0043" Priority="Strongly Recommended" /> 
      <Rule RuleID="db_0042" Priority="Strongly Recommended" /> 
      <Rule RuleID="na_0005" Priority="Strongly Recommended" /> 
      <Rule RuleID="jc_0081" Priority="Recommended" /> 
      <Rule RuleID="jm_0002" Priority="Mandatory" /> 
      <Rule RuleID="db_0142" Priority="Strongly Recommended" /> 
      <Rule RuleID="jc_0061" Priority="Recommended" /> 
      <Rule RuleID="db_0146" Priority="Strongly Recommended" /> 
      <Rule RuleID="db_0140" Priority="Recommended" /> 
      <Rule RuleID="jm_0013" Priority="Strongly Recommended" /> 
      <Rule RuleID="db_0032" Priority="Strongly Recommended" /> 
      <Rule RuleID="db_0141" Priority="Strongly Recommended" /> 
      <Rule RuleID="jc_0171" Priority="Strongly Recommended" /> 
      <Rule RuleID="jm_0010" Priority="Strongly Recommended" /> 
      <Rule RuleID="jc_0281" Priority="Strongly Recommended" /> 
      <Rule RuleID="na_0008" Priority="Recommended" /> 
      <Rule RuleID="na_0009" Priority="Strongly Recommended" /> 
    </OmittedRules>
  </BBCE>
</Summary>

C#代码：

var button = sender as Button;
var parent = button.Parent as FrameworkElement;
//(Textbox to take element`s name)
var textBox = parent.FindName("textbox1") as TextBox;
var textbl = parent.FindName("abc") as TextBlock;
var com = parent.FindName("cbox1") as ComboBox;
//(Textbox to take ATTRIBUTE`s name)  
var textBox1 = parent.FindName("textbox2") as TextBox;
XElement ele = XElement.Load(txtFileName.Text);
//working with Xelement.desendents it works fine
var fil = from item in ele.Elements(textbl.Text)
          select item.Element(textBox.Text).Attribute(textBox1.Text);
foreach (var f in fil)
{
    Label lb = new Label();
    lb.Content = f;
    canvas1.Children.Add(lb);
}

我观察到，当只使用BBCE元素时，它可以很好地工作，但在添加具有属性的Summary元素（Elements方法）时则不起作用。

我是不是错过了什么？

XElement.Elements(XName)方法无法读取具有属性的xml节点

Elements（name）方法返回节点的子元素。Descendants（name）方法返回节点的子代元素。这是意料之中的行为。

因此，当您调用ele.Elements(textbl.Text)时，搜索将仅在ele元素的直接子元素之间进行。当您通过XElement ele = XElement.Load加载文件时，ele元素将是xml的根元素。即您的案例中的<Summary>元素。它有一个子<BBCE>。这就是为什么在使用Elements()方法进行搜索时只能找到<BBCE>的原因。

在您的案例中，Descendants()方法将搜索文档中的任何元素，<Summary>节点本身除外。

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