query InfoPaht nodes

secDSNav.Select("/dfs:myFields/dfs:dataFields/d:SharePointListItem_RW[d:EXPRTN_DT!='']", NamespaceManager);

secDSNav.Select("/dfs:myFields/dfs:dataFields/d:SharePointListItem_RW/d:EXPRTN_DT[not(text())]", NamespaceManager)

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原文地址：https://www.cnblogs.com/mingle/p/2318043.html