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C# code:

System.Xml.XmlNode node = xmlDoc.SelectSingleNode("root/" + key); //key½Úµã
if (node == null){
//²»´æÔÚ
}



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C# code

System.Xml.XmlNode node = xmlDoc.SelectSingleNode("root/" + key); //key½Úµã
if (node == null){
//²»´æÔÚ
}


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Assembly code:
Dim node As System.Xml.XmlNode = xmlDoc.SelectSingleNode("root/" & key)
'key½Úµã
If node Is Nothing Then
'²»´æÔÚ
End If


VB.NET code:
Dim node As System.Xml.XmlNode = xmlDoc.SelectSingleNode("root/" & key)
'key½Úµã
If node Is Nothing Then
'²»´æÔÚ
End If


Dim node As System.Xml.XmlNode = xmlDoc.SelectSingleNode("//Root/A[@id=" & id & "]")
If node IsNot Nothing Then
End If

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<?mso-application progid="Excel.Sheet"?>
<Workbook xmlns="urn:schemas-microsoft-com:office:spreadsheet"
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