sqllite错误:The 'DbProviderFactories'节只能在每个配置文件(IBM Cl

我在。net 4.5上使用WPF和c#为我的应用程序使用Entity Framework和System.Data.SQLite在我的机器上工作得很好，但是在测试机器上，当我通过EntityFramework访问sqlite db时，我收到了这个错误:

'DbProviderFactories'节只能在每个配置中出现一次文件。

我发现错误是在测试机器中，在machine.config中:

<system.data>
    <DbProviderFactories>
        <add name="IBM DB2 for i5/OS .NET Provider" invariant="IBM.Data.DB2.iSeries" description=".NET Framework Data Provider for i5/OS" type="IBM.Data.DB2.iSeries.iDB2Factory, IBM.Data.DB2.iSeries, Version=12.0.0.0, Culture=neutral, PublicKeyToken=9cdb2ebfb1f93a26"/>
        <add name="Microsoft SQL Server Compact Data Provider" invariant="System.Data.SqlServerCe.3.5" description=".NET Framework Data Provider for Microsoft SQL Server Compact" type="System.Data.SqlServerCe.SqlCeProviderFactory, System.Data.SqlServerCe, Version=3.5.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91"/>
        <add name="IBM DB2 for i .NET Provider" invariant="IBM.Data.DB2.iSeries" description=".NET Framework Data Provider for IBM i" type="IBM.Data.DB2.iSeries.iDB2Factory, IBM.Data.DB2.iSeries, Version=12.0.0.0, Culture=neutral, PublicKeyToken=9cdb2ebfb1f93a26" />
    </DbProviderFactories>
    <!-- This is the line to remove - empty element --> 
    <DbProviderFactories/>
</system.data>

我删除了最后一个空元素，现在所有的工作。我想这与IBM.Data.DB2有关。iSeries安装(IBM Client Access).

我的问题是:如何删除空元素没有手动编辑machine.config?我试图在app.config文件中插入标记<clear />，但不工作。

我发现了另一个类似的问题，但没有人建议如何在不手动编辑机器的情况下解决问题。

这是我的应用配置文件:

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <configSections>
    <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
    <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=5.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
  </configSections>
  <system.xml.serialization>
    <xmlSerializer useLegacySerializerGeneration="true" />
  </system.xml.serialization>
  <startup>
    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
    <!--STAI MOLTO ATTENTO-->
    <legacyUnhandledExceptionPolicy enabled="1"/>
  </startup>
  <connectionStrings>
    <add name="db" connectionString="Data Source=clients.db;Version=3;New=False;Compress=True;" />
    <add name="icmdbEntities" connectionString="metadata=res://*/MainModel.csdl|res://*/MainModel.ssdl|res://*/MainModel.msl;provider=System.Data.SQLite;provider connection string=&quot;data source=.'icmdb.db&quot;" providerName="System.Data.EntityClient" />
  </connectionStrings>
  <entityFramework>
    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">
      <parameters>
        <parameter value="v11.0" />
      </parameters>
    </defaultConnectionFactory>
  </entityFramework>
  <system.data>
    <DbProviderFactories>
      <clear />
      <remove invariant="System.Data.SQLite" />
      <add name="SQLite Data Provider" invariant="System.Data.SQLite" description=".Net Framework Data Provider for SQLite" type="System.Data.SQLite.SQLiteFactory, System.Data.SQLite" />
    </DbProviderFactories>
  </system.data>
  <appSettings>
    <add key="ditta" value="default" />
    <add key="demo" value="true"/>
    <add key="ClientSettingsProvider.ServiceUri" value="" />
  </appSettings>
  <system.web>
    <membership defaultProvider="ClientAuthenticationMembershipProvider">
      <providers>
        <add name="ClientAuthenticationMembershipProvider" type="System.Web.ClientServices.Providers.ClientFormsAuthenticationMembershipProvider, System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" serviceUri="" />
      </providers>
    </membership>
    <roleManager defaultProvider="ClientRoleProvider" enabled="true">
      <providers>
        <add name="ClientRoleProvider" type="System.Web.ClientServices.Providers.ClientRoleProvider, System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" serviceUri="" cacheTimeout="86400" />
      </providers>
    </roleManager>
  </system.web>
</configuration>