使用LINQ XML查询属性值

Question

我是C＃中查询XML文件的新手。 任何帮助，将不胜感激。 提前致谢..

我有这个XML文件：

<Point>
      <Statement>
        <Type />
        <FullCondtion />
        <ExpressionList />
      </Statement>
      <TestList>
        <Test>
          <Inputs>
            <Variable Name="u1_count" Value="0" />
            <Variable Name="u1_flag" Value="2" />
            <Variable Name="ON" Value="1" />
            <Variable Name="OFF" Value="0" />
            <Variable Name="u1_ch" Value="0" />
            <Variable Name="u1_index" Value="3" />
          </Inputs>
          <Outputs>
            <Variable Name="u1_count" Value="0" />
            <Variable Name="u1_flag" Value="0" />
            <Variable Name="ON" Value="1" />
            <Variable Name="OFF" Value="0" />
            <Variable Name="u1_ch" Value="0" />
            <Variable Name="u1_index" Value="0" />
          </Outputs>
        </Test>
        <Test>
          <Inputs>
            <Variable Name="u1_count" Value="0" />
            <Variable Name="u1_flag" Value="2" />
            <Variable Name="ON" Value="1" />
            <Variable Name="OFF" Value="0" />
            <Variable Name="u1_ch" Value="0" />
            <Variable Name="u1_index" Value="3" />
          </Inputs>
          <Outputs>
            <Variable Name="u1_count" Value="0" />
            <Variable Name="u1_flag" Value="0" />
            <Variable Name="ON" Value="1" />
            <Variable Name="OFF" Value="0" />
            <Variable Name="u1_ch" Value="0" />
            <Variable Name="u1_index" Value="0" />
          </Outputs>
        </Test>
      </TestList>
      <TestList>
        <Test>
          <Inputs>
            <Variable Name="u1_count" Value="0" />
            <Variable Name="u1_flag" Value="2" />
            <Variable Name="ON" Value="1" />
            <Variable Name="OFF" Value="0" />
            <Variable Name="u1_ch" Value="0" />
            <Variable Name="u1_index" Value="3" />
          </Inputs>
          <Outputs>
            <Variable Name="u1_count" Value="0" />
            <Variable Name="u1_flag" Value="0" />
            <Variable Name="ON" Value="1" />
            <Variable Name="OFF" Value="0" />
            <Variable Name="u1_ch" Value="0" />
            <Variable Name="u1_index" Value="0" />
          </Outputs>
        </Test>
        <Test>
          <Inputs>
            <Variable Name="u1_count" Value="0" />
            <Variable Name="u1_flag" Value="2" />
            <Variable Name="ON" Value="1" />
            <Variable Name="OFF" Value="0" />
            <Variable Name="u1_ch" Value="0" />
            <Variable Name="u1_index" Value="3" />
          </Inputs>
          <Outputs>
            <Variable Name="u1_count" Value="0" />
            <Variable Name="u1_flag" Value="0" />
            <Variable Name="ON" Value="1" />
            <Variable Name="OFF" Value="0" />
            <Variable Name="u1_ch" Value="0" />
            <Variable Name="u1_index" Value="0" />
          </Outputs>
        </Test>
      </TestList>
    </Point>
  </Pattern>
</CodeAnalyzerResults>

我需要将输入和输出中的变量及其值写在一个表中，如下所示：

输入

u1_count 0 0 0 0

u1_flag 2 2 2 2

...

u1_index 3 3 3 3

对输出也执行相同的操作。如何获取每个变量的输入和输出值，并将它们写成一行？

我读了这篇文章： http : //www.c-sharpcorner.com/uploadfile/dhananjaycoder/reading-xml-file-through-linq-a-few-tips/但我仍然想不出一种方法..

Answer 1

您可以使用LINQ to XML（Sytem.Xml.Linq程序集）

XDocument doc = XDocument.Load("xml uri");

IEnumerable<string> inputs = 
                        from input in doc.Descendants("Inputs")
                        from el in input.Descendants("Variable")
                        let nameAtt = el.Attribute("Name")
                        let valueAtt = el.Attribute("Value")
                        where nameAtt != null && valueAtt != null
                        group valueAtt.Value by nameAtt.Value into grp
                        let values = string.Join(" ", grp.ToArray())
                        select string.Format("{0} {1}", grp.Key, values);

与outputs方式相同。

[编辑]按att值分组[编辑]导航到“变量”节点