我的XML文件大小为35 GB。我试图使用xmldocument加载此文件，但出现内存不足异常。因此，使用xmlreader解析xml数据以将其加载到数据库。但是，我无法读取父节点内的子节点。
示例XML文件内容：
文件名：wcproduction.xml
<root xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<xsd:schema targetNamespace="urn:schemas-microsoft-com:sql:SqlRowSet1" xmlns:schema="urn:schemas-microsoft-com:sql:SqlRowSet1" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:sqltypes="http://schemas.microsoft.com/sqlserver/2004/sqltypes" elementFormDefault="qualified">
<xsd:import namespace="http://schemas.microsoft.com/sqlserver/2004/sqltypes" schemaLocation="http://schemas.microsoft.com/sqlserver/2004/sqltypes/sqltypes.xsd"/>
<xsd:element name="wcproduction">
<xsd:complexType>
<xsd:sequence>
<xsd:element name="api_st_cde" type="sqltypes:smallint" nillable="1"/>
<xsd:element name="api_cnty_cde" type="sqltypes:smallint" nillable="1"/>
<xsd:element name="api_well_idn" type="sqltypes:int" nillable="1"/>
<xsd:element name="pool_idn" type="sqltypes:int" nillable="1"/>
<xsd:element name="prodn_mth" type="sqltypes:smallint" nillable="1"/>
<xsd:element name="prodn_yr" type="sqltypes:int" nillable="1"/>
<xsd:element name="ogrid_cde" type="sqltypes:int" nillable="1"/>
<xsd:element name="prd_knd_cde" nillable="1">
<xsd:simpleType>
<xsd:restriction base="sqltypes:char" sqltypes:localeId="1033" sqltypes:sqlCompareOptions="IgnoreCase IgnoreKanaType IgnoreWidth" sqltypes:sqlSortId="52">
<xsd:maxLength value="2"/>
</xsd:restriction>
</xsd:simpleType>
</xsd:element>
<xsd:element name="eff_dte" type="sqltypes:datetime" nillable="1"/>
<xsd:element name="amend_ind" nillable="1">
<xsd:simpleType>
<xsd:restriction base="sqltypes:char" sqltypes:localeId="1033" sqltypes:sqlCompareOptions="IgnoreCase IgnoreKanaType IgnoreWidth" sqltypes:sqlSortId="52">
<xsd:maxLength value="1"/>
</xsd:restriction>
</xsd:simpleType>
</xsd:element>
<xsd:element name="c115_wc_stat_cde" nillable="1">
<xsd:simpleType>
<xsd:restriction base="sqltypes:char" sqltypes:localeId="1033" sqltypes:sqlCompareOptions="IgnoreCase IgnoreKanaType IgnoreWidth" sqltypes:sqlSortId="52">
<xsd:maxLength value="1"/>
</xsd:restriction>
</xsd:simpleType>
</xsd:element>
<xsd:element name="prod_amt" type="sqltypes:int" nillable="1"/>
<xsd:element name="prodn_day_num" type="sqltypes:smallint" nillable="1"/>
<xsd:element name="mod_dte" type="sqltypes:datetime" nillable="1"/>
</xsd:sequence>
</xsd:complexType>
</xsd:element>
</xsd:schema>
<wcproduction xmlns="urn:schemas-microsoft-com:sql:SqlRowSet1">
<api_st_cde>30</api_st_cde>
<api_cnty_cde>5</api_cnty_cde>
<api_well_idn>20178</api_well_idn>
<pool_idn>10540</pool_idn>
<prodn_mth>7</prodn_mth>
<prodn_yr>1973</prodn_yr>
<ogrid_cde>12437</ogrid_cde>
<prd_knd_cde>G </prd_knd_cde>
<eff_dte>1973-07-31T00:00:00</eff_dte>
<amend_ind>N</amend_ind>
<c115_wc_stat_cde>F</c115_wc_stat_cde>
<prod_amt>53612</prod_amt>
<prodn_day_num>99</prodn_day_num>
<mod_dte>2015-04-07T07:31:00.173</mod_dte>
</wcproduction>
</root>
试图读取父节点wcproduction及其子节点（api_st_cde，api_cnty_cde等）的VB.net代码
Dim settings As XmlReaderSettings = New XmlReaderSettings()
settings.IgnoreWhitespace = True
Using reader As XmlReader = XmlReader.Create("D:\\wcproduction.xml", settings)
reader.ReadToFollowing("wcproduction")
Do
Dim inner As XmlReader = reader.ReadSubtree()
Dim str As String = ""
inner.ReadToDescendant("api_st_cde")
str = inner.ReadInnerXml
inner.ReadToDescendant("api_cnty_cde")
str = str & ", " & inner.ReadInnerXml
inner.ReadToDescendant("api_well_idn")
str = str & ", " & inner.ReadInnerXml
inner.ReadToDescendant("pool_idn")
str = str & ", " & inner.ReadInnerXml
inner.ReadToDescendant("prodn_mth")
str = str & ", " & inner.ReadInnerXml
inner.ReadToDescendant("prodn_yr")
str = str & ", " & inner.ReadInnerXml
inner.ReadToDescendant("ogrid_cde")
str = str & ", " & inner.ReadInnerXml
inner.ReadToDescendant("prd_knd_cde")
str = str & ", " & inner.ReadInnerXml
inner.ReadToDescendant("eff_dte")
str = str & ", " & inner.ReadInnerXml
inner.ReadToDescendant("amend_ind")
str = str & ", " & inner.ReadInnerXml
inner.ReadToDescendant("c115_wc_stat_cde")
str = str & ", " & inner.ReadInnerXml
inner.ReadToDescendant("prod_amt")
str = str & ", " & inner.ReadInnerXml
inner.ReadToDescendant("prodn_day_num")
str = str & ", " & inner.ReadInnerXml
inner.ReadToDescendant("mod_dte")
str = str & ", " & inner.ReadInnerXml
MsgBox(str)
inner.Close()
Loop While (reader.ReadToNextSibling("wcproduction"))
End Using
我想读取所有节点（wcproduction）及其子节点并将其上载到SQL Server。
答案 0 :(得分：1)
尝试下面的代码，该代码结合使用XmlReader和xml linq
Imports System.Xml
Imports System.Xml.Linq
Module Module1
Const FILENAME As String = "c:\temp\test.xml"
Sub Main()
Dim wcProdcutions As New List(Of WCProduction)
Dim reader As XmlReader = XmlReader.Create(FILENAME)
While (Not reader.EOF)
If reader.Name <> "wcproduction" Then
reader.ReadToFollowing("wcproduction")
End If
If Not reader.EOF Then
Dim xWcproduction As XElement = XElement.ReadFrom(reader)
Dim ns As XNamespace = xWcproduction.GetDefaultNamespace()
Dim wcproduction As New WCProduction
wcProdcutions.Add(wcproduction)
wcproduction.api_st_cde = CType(xWcproduction.Element(ns + "api_st_cde"), Integer)
wcproduction.api_well_idn = CType(xWcproduction.Element(ns + "api_well_idn"), Integer)
wcproduction.pool_idn = CType(xWcproduction.Element(ns + "pool_idn"), Integer)
wcproduction.prodn_mth = CType(xWcproduction.Element(ns + "prodn_mth"), Integer)
wcproduction.prodn_yr = CType(xWcproduction.Element(ns + "prodn_yr"), Integer)
wcproduction.ogrid_cde = CType(xWcproduction.Element(ns + "ogrid_cde"), Integer)
wcproduction.prd_knd_cde = CType(xWcproduction.Element(ns + "prd_knd_cde"), String)
wcproduction.eff_dte = CType(xWcproduction.Element(ns + "eff_dte"), DateTime)
wcproduction.amend_ind = CType(xWcproduction.Element(ns + "amend_ind"), String)
wcproduction.c115_wc_stat_cde = CType(xWcproduction.Element(ns + "c115_wc_stat_cde"), String)
wcproduction.prod_amt = CType(xWcproduction.Element(ns + "prod_amt"), Integer)
wcproduction.prodn_day_num = CType(xWcproduction.Element(ns + "prodn_day_num"), Integer)
wcproduction.mod_dte = CType(xWcproduction.Element(ns + "mod_dte"), DateTime)
End If
End While
End Sub
End Module
Public Class WCProduction
Public api_st_cde As Integer
Public api_cnty_cde As Integer
Public api_well_idn As Integer
Public pool_idn As Integer
Public prodn_mth As Integer
Public prodn_yr As Integer
Public ogrid_cde As Integer
Public prd_knd_cde As String
Public eff_dte As DateTime
Public amend_ind As String
Public c115_wc_stat_cde As String
Public prod_amt As Integer
Public prodn_day_num As Integer
Public mod_dte As DateTime
End Class