检查XmlNode是否有孩子 [英] Check if XmlNode has childs

问题描述

我想通过读取Xml文件来创建TreeNode.我管理了创建ParentNodes(组)的操作，但我想也将用户(Xml子节点)添加到这些组中.

运行此代码后:

I want to make a TreeNode by reading an Xml file. I mananged to create the ParentNodes(The Groups) but I want to add also users(the Xml child nodes) to these groups.

After running this code:

Public Sub ReadGroup_Xml()
    GroupsList.Load(xml_path)

    Dim TreeNode2, TreeNode3 As TreeNode
    Dim names_list1 = GroupsList.GetElementsByTagName("Group_Name")
    Dim names_list2 = GroupsList.GetElementsByTagName("User_Initials")
    For Each item1 As XmlElement In names_list1
        'Here I add the parent nodes
        TreeNode2 = New TreeNode(item1.InnerText)
        MUsersFrm.TreeView1.Nodes.Add(TreeNode2)
        TreeNode2.ImageIndex = 0

        'Here I want to add the child nodes
        'What is the condition???
        For Each item2 As XmlElement In names_list2
            TreeNode3 = New TreeNode(item2.InnerText)
            TreeNode2.Nodes.Add(TreeNode3)
        Next
    Next
End Sub

我得到结果:

I get the result:

Group Administrators
 - User am
Group Editors
 - User am
Group Guests
 - User am

正确的结果应该是:

The correct result should be:

Group Administrators
Group Editors
 - User am
Group Guests

...因为仅组编辑器"节点包含子节点

我认为注释的文本在创建子节点之前应该有条件.

您可以在这种情况下为我提供帮助吗?

...because only the Group Editors node contains childs nodes

I think that the commented text should have a condition before creating the child nodes.

Can you help me with this condition?

推荐答案

我认为您可以使用

I think you could use

If item1.HasChildNodes Then

过滤出空的父节点.

to filter out the empty parent nodes.

如果您发布了xml文件的示例，将很有帮助，但这是基于此xml的示例.

It would be helpful if you posted a sample of your xml file, but here is an example based on this xml.

<?xml version="1.0" encoding="utf-8" ?>
<groups>
  <group Name="Administrators"></group>
  <group Name="Editors">
    <User_Initials>abc</User_Initials>
    <User_Initials>zyz</User_Initials>
  </group>
  <group Name="Guests"></group>
</groups>

Dim doc As New Xml.XmlDocument
doc.Load("xmlfile1.xml")

Dim groups As Xml.XmlNodeList = doc.SelectNodes("./groups/group")

For Each grp As Xml.XmlElement In groups
   Dim node As TreeNode = TreeView1.Nodes.Add(grp.GetAttribute("Name"))
   For Each user As Xml.XmlNode In grp.SelectNodes("./User_Initials")
      node.Nodes.Add(user.InnerText)
   Next
Next

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