Winform 利用 Oracle.ManagedDataAccess访问Oracle数据库

Winform 利用 Oracle.ManagedDataAccess访问Oracle数据库时出现以下错误：

Message = "每个配置文件中只允许存在一个 <configSections> 元素，并且，如果存在该元素，它还必须是根 <configuration> 元素的第一个子元素。

出现以上错误时，需调整app.config中配置节点，将configSections的节点放在第一个子元素，入一下配置文件

<?xml version="1.0" encoding="utf-8"?>

<configuration>

	  <configSections>

		<section name="oracle.manageddataaccess.client"

		  type="OracleInternal.Common.ODPMSectionHandler, Oracle.ManagedDataAccess, Version=4.122.18.3, Culture=neutral, PublicKeyToken=89b483f429c47342"/>

		<section name="log4net" type="System.Configuration.IgnoreSectionHandler"/>

	  </configSections>

	<startup>

		<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/>

	</startup>

  <log4net>

    <root>

      <appender-ref ref="LogFileAppender"/>

    </root>

    <appender name="LogFileAppender" type="log4net.Appender.RollingFileAppender">

      <file value="./log/log4netfile.txt"/>

      <appendToFile value="true"/>

      <rollingStyle value="Date"/>

      <LockingModel type="log4net.Appender.FileAppender+MinimalLock, log4net"/>

      <datePattern value="yyyyMMdd-HH:mm:ss"/>

      <layout type="log4net.Layout.PatternLayout">

        <param name="ConversionPattern" value="%d [%t] %-5p %c [%x] %X{auth} - Line:%L %m%n"/>

      </layout>

    </appender>

  </log4net>

  <system.data>

    <DbProviderFactories>

      <remove invariant="Oracle.ManagedDataAccess.Client"/>

      <add name="ODP.NET, Managed Driver" invariant="Oracle.ManagedDataAccess.Client" description="Oracle Data Provider for .NET, Managed Driver"

        type="Oracle.ManagedDataAccess.Client.OracleClientFactory, Oracle.ManagedDataAccess, Version=4.122.18.3, Culture=neutral, PublicKeyToken=89b483f429c47342"/>

    </DbProviderFactories>

  </system.data>

  <runtime>

    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">

      <dependentAssembly>

        <publisherPolicy apply="no"/>

        <assemblyIdentity name="Oracle.ManagedDataAccess" publicKeyToken="89b483f429c47342" culture="neutral"/>

        <bindingRedirect oldVersion="4.122.0.0 - 4.65535.65535.65535" newVersion="4.122.18.3"/>

      </dependentAssembly>

    </assemblyBinding>

  </runtime>

  <oracle.manageddataaccess.client>

    <version number="*">

      <dataSources>

        <dataSource alias="SampleDataSource" descriptor="(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=localhost)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=ORCL))) "/>

      </dataSources>

    </version>

  </oracle.manageddataaccess.client>

</configuration>