如何访问具有属性值的 XML 文件中的元素？

Question

这是我的 XML 文件

<colleges>

    <college college_name="DYPSOE">
        <departments>
            <department department_name="Computer" id="10">
            <![CDATA[I NEED TO CHANGE THIS COMMENT!]]>
            </department>
            <department department_name="Machanical" id="20">
            <![CDATA[I NEED TO CHANGE THIS COMMENT!]]>
            </department>
        </departments>
    </college>

    <college college_name="DYPSOET">
        <departments>
            <department department_name="Computer" id="10">
            <![CDATA[I NEED TO CHANGE THIS COMMENT!]]>
            </department>
            <department department_name="Machanical" id="20">
            <![CDATA[I NEED TO CHANGE THIS COMMENT!]]>
            </department>
        </departments>
    </college>

</colleges>

我在程序中有三个属性值 college_name、department_name 和 id。所以我想转到特定的 "Department" 节点并使用这三个属性值更改注释中的值。

我正在尝试通过不同的查询访问节点，到目前为止失败了。

var node = from e in doc.Descendants("college")
           where e.Attribute("college_name").ToString() == college_name
           select (XElement)e.Elements("department");


foreach (XElement data in node)
{
    Console.WriteLine(data); //Just to look what I got
    data.Value = ""; //To change the comment section
}

这根本不起作用。如果你们能给我建议查询，那将对我有很大帮助。

Answer 1

我想你可以使用 System.Xml.XmlReader to read the nodes' attribute and write it with System.Xml.XmlWriter

How to: Parse XML with XmlReader有解析写入的例子

Answer 2

假设您想要 select 一个基于学院和部门名称的单个部门元素，您可以使用如下查询找到它：

var query = from college in doc.Descendants("college")
            where (string) college.Attribute("college_name") == "DYPSOE"
            from department in college.Descendants("department")
            where (string) department.Attribute("department_name") == "Computer"
            select department;

var element = query.Single();

然后您可以像这样替换评论：

element.ReplaceNodes(new XCData("new comment"));

如何访问具有属性值的 XML 文件中的元素？

How to access element in XML files with attribute values?

c#

linq-to-xml