如何在 VB.NET 中读取 XML 元素
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How to read XML elements in VB.NET
提问by Nianios
I have a very simple problem, but since I am new to XML, I face some problems. I have this XML document:
我有一个非常简单的问题，但由于我是 XML 的新手，所以我遇到了一些问题。我有这个 XML 文档：
<?xml version="1.0" encoding="utf-8"?>
<Form_Layout>
<Location>
<LocX>100</LocX>
<LocY>100</LocY>
</Location>
<Size>
<Width>300</Width>
<Height>300</Height>
</Size>
</Form_Layout>
What I want to do is read the values from the LocX, LoxY, Width, and Height elements into my corresponding variables.
我想要做的是将 LocX、LoxY、Width 和 Height 元素中的值读入我相应的变量中。
Here is what I have tried:
这是我尝试过的：
Dim XmlReader = New XmlNodeReader(xmlDoc)
While XmlReader.Read
Select Case XmlReader.Name.ToString()
Case "Location"
If XmlReader.??
Case "Size"
If XmlReader.??
End Select
End While
But, I cannot figure out how to access each child Node.
但是，我无法弄清楚如何访问每个子节点。
回答by Mark Hurd
If you're able to use Linq to XML, you can use VB's XML Axis Properties:
如果您能够使用 Linq to XML，则可以使用 VB 的XML 轴属性：
Dim root As XElement = XDocument.Load(fileName).Root
Dim LocX = Integer.Parse(root.<Location>.<LocX>.Value)
Dim LocY = Integer.Parse(root.<Location>.<LocY>.Value)
And root.<Location>.<LocY>.Value = CStr(120)works too.
也root.<Location>.<LocY>.Value = CStr(120)有效。
回答by Steven Doggart
Here's how you can do it with XmlDocumentand XPath. I'm sure someone else will be happy to volunteer an example using XDocumentand LINQ.
下面是您如何使用XmlDocumentXPath来完成它。我相信其他人会很乐意自愿提供一个使用XDocumentLINQ的示例。
Dim doc As New XmlDocument()
doc.LoadXml("...")
Dim locX As Integer = Integer.Parse(doc.SelectSingleNode("/FormLayout/Location/LocX").InnerText)
Dim locY As Integer = Integer.Parse(doc.SelectSingleNode("/FormLayout/Location/LocY").InnerText)
Dim width As Integer = Integer.Parse(doc.SelectSingleNode("/FormLayout/Size/Width").InnerText)
Dim height As Integer = Integer.Parse(doc.SelectSingleNode("/FormLayout/Size/Height").InnerText)
Also, you may want to take a look at the XmlSerializerclass, and see if that is something you are interested in. That class will read the XML document and use it to populate the property values of a new object. You just need to create a class that mimics the structure of the XML for it to deserialize into.
此外，您可能想查看XmlSerializer该类，看看您是否对它感兴趣。该类将读取 XML 文档并使用它来填充新对象的属性值。您只需要创建一个类来模拟 XML 的结构，以便将其反序列化。
回答by adatapost
Use LINQ-XML,
使用 LINQ-XML，
Dim root As XElement = XDocument.Load(fileName).Root
Dim LocX = Integer.Parse(root.Element("Location").Element("LocX").Value)
Dim LocY = Integer.Parse(root.Element("Location").Element("LocY").Value)
