xml - 如何确定 XmlNode 是否具有特定属性？

Question

我想在 sub 中放置一个 if 条件，告诉它在具有属性 TEST="test.doc"的 xml 节点 STORE 不存在时运行。任何建议都会很棒。我是vb的新手。

Sub InsertNode(ByVal doc As XmlDocument)   
    Dim City As XmlNode = doc.DocumentElement

    Dim Location As XmlElement = doc.CreateElement("store")
    Location.SetAttribute("test", "test.doc")

    Dim books As XmlElement = doc.CreateElement("books")
    books.InnerXml = "New Words"
    Location.AppendChild(books)

    City.AppendChild(store)
End Sub 'InsertNode

---

XML 文件示例

<city>
    <store test="test.doc">
        <books>
        "New Words" 
        </books>
    </store>
</city>

Answer 1

尝试这样的事情:

If Not doc.SelectSingleNode("//store[@test='test.doc']") Is Nothing Then
    Exit Sub
End If