LINQ到XML：什么是移动节点上下的最有效方法 [英] LINQ to XML: What is the most effective way to move nodes up and down

问题描述

我需要之前某些节点后移到同级节点。在这里，以

I need to move sibling nodes before and after certain nodes. Here is the code im working with

<tabs>
     <tab>
          <name>Overview</name>
     </tab>
     <tab>
          <name>Testing</name>
     </tab>
     <tab>
          <name>Performance</name>
     </tab>
     <tab>
          <name>Braking</name>
     </tab>
</tabs>

我想上面概述其测试移动标签。我怎么会去这样使用LINQ to XML？

I would like to move the tab with testing in it above Overview. How would I go about this using linq to XML?

推荐答案

对不起，这是VB.NET和XML文本，但它可以完成老同学在C＃。这里的想法是使用反向延伸方式：

Sorry, this is VB.NET and XML Literals, but it can be done old school in C#. The idea here is to use the Reverse extention method:

Sub Main()
        Dim tab = <tabs>
                      <tab>
                          <name>Overview</name>
                      </tab>
                      <tab>
                          <name>Testing</name>
                      </tab>
                      <tab>
                          <name>Performance</name>
                      </tab>
                      <tab>
                          <name>Braking</name>
                      </tab>
                  </tabs>
        Console.WriteLine(SwapElements("Testing", "Performance", tab).ToString)
        Console.ReadLine()
    End Sub
    Function SwapElements(ByVal firstElement As String, ByVal secondElement As String, ByVal tab As XElement) As XElement
        Dim swapped = tab.Elements.Where(Function(e) e.Value = firstElement Or e.Value = secondElement).Reverse
        Dim middle = tab.Elements.SelectMany(Function(e) e.ElementsAfterSelf.Where(Function(f) e.Value = firstElement).TakeWhile(Function(g) g.Value <> secondElement))
        swapped.ElementAt(0).AddAfterSelf(middle)
        Return <<%= tab.Name %>>
                   <%= tab.Elements.Select(Function(e) e.ElementsBeforeSelf.Where(Function(f) e.Value = firstElement)) %>
                   <%= swapped %>
                   <%= tab.Elements.Select(Function(e) e.ElementsAfterSelf.Where(Function(f) e.Value = secondElement)) %>
               </>
    End Function

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