Question

我还在玩xml。现在我有一个看起来像这样的文件：

<?xml version="1.0" encoding="utf-8"?>
<Attributes>
 <AttributeSet id="10110">
  <Attribute id="1">some text here</Attribute>
  <Attribute id="2">some text here</Attribute>
  <!-- 298 more Attribute nodes follow -->
  <!-- note that the value for the id attribute is numbered consecutively -->
 </AttributeSet>
</Attributes>

总共有300个属性节点，其中大多数我不需要。我想要做的是删除没有id属性指定值的所有Attribute节点。我已经建立了一个包含大约10个值的字符串数组。这些值表示我想要保留在xml中的属性。其余的我想删除。

我正在尝试使用下面的代码修改xml，删除我不想使用的所有Attribute节点：

Dim ss() As String = New String() {"39", "41", "38", "111", "148", "222", "256", "270", "283", "284"} 'keep the Attributes whose id value is one of these numbers
Dim rv As New List(Of String)'will hold Attribute ids to remove
Dim bool As Boolean = False
For Each x As XElement In doc...<eb:Attribute>
 For Each s As String In ss
  If x.@id = s Then
   bool = True
   Exit For
  End If
 Next
 If bool = True Then
  'do nothing
 Else 'no attribute matched any of the attribute ids listed mark xelement for removal
  rv.Add(x.@id)
 End If
Next
'now remove the xelement
For Each tr As String In rv
 Dim h As String = tr
 doc...<eb:Attribute>.Where(Function(g) g.@id = h).Remove()
Next
'save the xml
doc.Save("C:\myXMLFile.xml")

出于某种原因，我的代码不起作用。没有任何不需要的属性节点被删除。

有什么问题？如何删除其id属性值与字符串数组中的任何数字都不匹配的Attribute节点？

提前致谢。

P.S。 - 我希望我能够清楚地描述我的问题。

Answer 1

没关系。我想到了。我在这里做了什么：

For Each x As XElement In doc...<eb:Attribute>
 **bool = False 'I simply added this line of code and everything worked perfectly**
 For Each s As String In ss
  If x.@id = s Then
   bool = True
   Exit For
  End If
 Next
 If bool = True Then
  'do nothing
 Else 'no attribute matched any of the attribute ids listed so remove the xelement
  rv.Add(x.@id)
 End If
Next

Answer 2

删除所有不需要的节点：

XDocument xDoc = XDocument.Load(xmlFilename);

List<string> keepList = new List<string> { "1", "2", "3" };

var unwanted = from element in xDoc.Elements("Attributes").Elements("AttributeSet").Elements("Attribute")
               where !keepList.Contains((string)element.Attribute("id"))
               select element;

unwanted.Remove();

xDoc.Save(xmlFilename);

根据属性删除XElement

2 个答案: