Question

让我说我有这个XML：

<items> 
  <item name="thumb"> 
    <downloadStream>test1</downloadStream> 
    <downloadStream>test2</downloadStream> 
    <downloadStream>test3</downloadStream> 
  </item> 
  <item name="photo"> 
    <downloadStream>test5</downloadStream> 
    <downloadStream>test6</downloadStream> 
    <downloadStream>test7</downloadStream> 
  </item> 
</items>

我正在尝试编写一个LINQ语句，将其转换为以下字符串：

{ "thumb test1",
  "thumb test2",
  "thumb test3",
  "photo test5",
  "photo test6",
  "photo test7", }

换句话说，它将父节点的属性附加到每个子节点的内部字符串。

他们是否可以使用一个LINQ查询来执行此类操作？我可以找到几种方法将其分解为多个步骤，但我感觉它们是一种更简单的方法。

谢谢！

Answer 1

XDocument.Load(myXML)
    .Descendants("item")
    .SelectMany(d => d.Descendants()
        .Select(ds => d.Attribute("name").Value + " " + ds.Value));

Answer 2

var list = x.Descendants("item")
            .SelectMany(item => item.Elements("downloadStream")
                                    .Select(e => (string)item.Attribute("name") 
                                                 + " " 
                                                 + (string)e)).ToList();

Answer 3

这是在VB.NET中。在C＃中也可以做同样的事情，但我对VB语法更熟悉。

    Dim itemsXml = <items>
                       <item name="thumb">
                           <downloadStream>test1</downloadStream>
                           <downloadStream>test2</downloadStream>
                           <downloadStream>test3</downloadStream>
                       </item>
                       <item name="photo">
                           <downloadStream>test5</downloadStream>
                           <downloadStream>test6</downloadStream>
                           <downloadStream>test7</downloadStream>
                       </item>
                   </items>
    Dim itemQuery = From ds In itemsXml...<downloadStream> _
                    Select ds.Parent.@name & " " & ds.Value

在LINQ select语句中使用xml父数据

3 个答案: