使用LINQ按属性查询XML [英] Querying XML with LINQ by attribute
本文介绍了使用LINQ按属性查询XML的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
给出以下XML文件:
<users>
<user name="admin" password="foobar" roles="Admin,Guest" />
<user name="guest" password="foobar" roles="Guest" />
</users>
如何找到特定的节点?在这种情况下,我想找到其名称属性为"admin"的节点
How do I find a specific node? In this case I want to find the node that has its name attribute to be "admin"
Dim authGroup As XElement = XElement.Parse(myXMLDoc.OuterXml)
Dim foundUser As IEnumerable(Of XElement) = From i In authGroup.Elements Where i.Attributes("name") = "admin" Select i
'How can I determine if the user was found?
Dim p As String = ...... (get the password from foundUser)
推荐答案
Dim doc As XElement =
<users>
<user name="admin" password="foobar" roles="Admin,Guest" />
<user name="guest" password="foobar" roles="Guest" />
</users>
Dim userName = "admin"
Dim result =
doc.Descendants("user") _
.Where(Function(user) CType(user.Attribute("name"), String) = userName) _
.SingleOrDefault
If result IsNot Nothing Then
' user found '
Dim pw = CType(result.Attribute("password"), String)
' do something with pw '
End If
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