excel - 如果不存在，如何创建具有特定值的属性 - VBA

Question

抱歉我的英语不好，但我会尽力正确描述我的问题。我有一个VBA代码。这是:

Sub TestXML()
Dim doc As New DOMDocument
    Const filePath As String = "D:\Test3.xml"
    Dim isLoaded As Boolean

    isLoaded = doc.Load(filePath)

    If isLoaded Then
        Dim oAttributes As MSXML2.IXMLDOMNodeList
        Set oAttributes = doc.getElementsByTagName("Operation")

        Dim attr As MSXML2.IXMLDOMAttribute
        Dim node As MSXML2.IXMLDOMElement
        Dim tdate As String
        tdate = Format(Now(), "yyyy-mm-dd")
        For Each node In oAttributes
            For Each attr In node.Attributes
                If attr.Name = "Client" Then
                 If attr.Value <> "UL" Then
                    attr.Value = "UL"
                    End If
                ElseIf attr.Name = "Date" Then
                    If attr.Value <> "tdate" Then
                    attr.Value = tdate
                End If
                End If
            Next attr
        Next node

        doc.Save filePath

    End If
End Sub

问题是 - 仅当元素“Operation”不存在时，如何创建值为“UL”的属性“Client”？ 这是我使用的 .xml 文件示例:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<Document>
    <Operations>
        <Operation Date="2018-11-06" Client="UL"/>
        <Operation Date="2018-11-06" Client="UL"/>
        <Operation Date="2018-11-06"/>
    </Operations>
</Document>

谢谢!

Answer 1

尝试读取属性节点，如果不存在则创建它:

For Each node In oAttributes

    If (node.getAttributeNode("Client") Is Nothing) Then
        '// add missing attrib
        node.setAttribute "Client", "UL"
    End If

您当前的代码似乎希望所有元素都具有 Client=UL，以简单地实现这一点:

For Each node In oAttributes
    node.setAttribute "Client", "UL"
Next node

这将根据需要覆盖或创建属性。