vb.net 解析 XML 以获取节点值
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Parse XML to get node value
提问by Lucas
I want to parse XML string like this one:
我想像这样解析 XML 字符串：
<Folk id="4630" country="US" name="Marry" />
<Folk id="4630" country="US" name="Marry" />
(which is placed in the rich textbox editor)
（放置在富文本框编辑器中）
And fetch the id, country, namevalues.
并获取id, country,name值。
What have I tried:
我试过什么：
Dim content As String = Me.RichTextBox1.Text
Dim doc As New System.Xml.XmlDocument
Try
doc.LoadXml(content)
Catch ex As Exception
Label2.Text = "No XML Elements!!!!"
End Try
Dim items = doc.GetElementsByTagName("Folk")
For Each item As System.Xml.XmlElement In items
Dim id As String = item.ChildNodes(0).InnerText()
MsgBox(id) 'Try to prompt a message box containing the id=""
Next
It does ends up with an error showing up: NullReferenceException was unhandled.- it doesnt found the idthere, so I dont handle this error, first I would like to get the proper return, then I will handle if there is nothing found. So why it doesnt return the Folkid=""? Is the access to the node called wrong?
它最终会出现一个错误：NullReferenceException was unhandled.- 它没有在id那里找到，所以我不处理这个错误，首先我想得到正确的回报，然后我会处理如果没有找到任何东西。那么为什么它不返回Folkid=""？对节点的访问调用是错误的吗？
采纳答案by David Tansey
The problem is the way that you are trying to reference the XML after it has been parsed.
问题在于您在解析 XML 后尝试引用 XML 的方式。
Try changing this line:
尝试更改此行：
Dim id As String = item.ChildNodes(0).InnerText()
To the following:
对以下内容：
Dim id As String = item.Attributes(0)
countryand namewould be:
country并且name将是：
Dim country As String = item.Attributes(1)
Dim name As String = item.Attributes(2)
edit:sorry, I was speaking c# and vb.net at the same time. now fixed.
编辑：抱歉，我同时在说 c# 和 vb.net。现在固定。
