ÅжÏxmlµÄÒ»¸ö½ÚµãÊÇ·ñ´æÔÚ - .NET¼¼Êõ / VB.NET

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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

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

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

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