如何使用 XDocument 查询获取正确的元素

Question

我在尝试使用 XDocument 解析 XML 文件时无法正确查询。

我想要的：

给我所有 "Name" 步骤元素的值，id = "id_3" 所以结果应该是一个列表，其中包含“第 1 部分的名称，第 2 部分的名称，第 3 部分的名称，第 4 部分的名称.

输入XML:

<MyXML>
   <Step id="id_1" type="type1">
     <Name>Some Name</Name>
     <Location>1</Location>
     <Quantity>1</Quantity>
   </Step>
   <Step id="id_2" type="type1">
     <Name>>Some Name</Name>
     <Location>2</Location>
     <Quantity>1</Quantity>
   </Step>
   <Step id="id_3" type="type2">
     <Instruction>This is some text</Instruction>
     <Component>
       <Name>Name of part 1</Name> // --> I want this value
       <Transition_Start>-0.2,0.01,0.0</Transition_Start>
       <Transition_End>0,0.01,0.0</Transition_End>
     </Component>
     <Component>
       <Name>Name of part 2</Name> // --> and this
       <Transition_Start>0.2,0.01,0</Transition_Start>
       <Transition_End>0,0.01,0</Transition_End>
     </Component>
     <Component>
       <Name>Name of part 3</Name> // --> and this
       <Transition_Start>0.05,0.1004,0.0333</Transition_Start>
       <Transition_End>-0.0803,0.1004,0.0333</Transition_End>
     </Component>
     <Component>
       <Name>Name of part 4</Name> // --> and this
       <Transition_Start>-0.0107,0.0383,-0.2328</Transition_Start>
       <Transition_End>-0.0107,0.0383,-0.2328</Transition_End>
     </Component>
   </Step>
 </MyXML>

我尝试过这样的事情（在 Unity3D 中）。

IEnumerable<XElement> e_nameOfObjects = 
                from el in myXMLDoc.Root.Elements ("Step")
                where (string)el.Attribute ("id") == "id_" + currentStep
                select el.Elements ("Component");

foreach (XElement e in e_nameOfObjects) {
    Debug.Log (e.Element("Name"));
}

错误信息：

Cannot implicitly convert type System.Collections.Generic.IEnumerable>' to System.Collections.Generic.IEnumerable'. An explicit conversion exists (are you missing a cast?)

Answer 1

您可以使用 Elements 方法获取所有组件，然后在这些组件中 select Name 像这样：-

var names = myXMLDoc.Descendants("Step")
            .Where(x => (string)x.Attribute("id") == "id_3")
            .Elements("Component")
            .Select(x => (string)x.Element("Name"));

在这里，names 将 return IEnumerable<string> 您可以在其中轻松地遍历 foreach 循环。

Working Fiddle.

如何使用 XDocument 查询获取正确的元素

How to get the right elements with XDocument query

c#

xml

linq-to-xml