未找到具有不变名称“System.Data.SqlServerCe.4.0”的ADO.NET提供程序的实体框架提供程序

问题描述

当我使用sqlce 4.0 with entityframework 6.0时，出现以下错误

 没有为ADO.NET找到实体框架不变名System.Data.SqlServerCe.4.0的提供程序
  

我的app.config看起来像这样

  .... 
< configSections> 
< section name =log4nettype =log4net.Config.Log4NetConfigurationSectionHandler，log4netrequirePermission =false/> 
< section name =entityFrameworktype =System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection，EntityFramework，Version = 6.0.0.0，Culture = neutral，PublicKeyToken = b77a5c561934e089requirePermission =false/> ; 
<！ - 有关实体框架配置的详细信息，请访问http://go.microsoft.com/fwlink/?LinkID=237468  - > 
<！ - 有关Entity Framework配置的详细信息，请访问http://go.microsoft.com/fwlink/?LinkID=237468  - >< / configSections> 
< entityFramework> 
< defaultConnectionFactory type =System.Data.Entity.Infrastructure.SqlConnectionFactory，EntityFramework> 
< parameters> 
< parameter value =System.Data.SqlServerCe.4.0/> 
< / parameters> 
< / defaultConnectionFactory> 
<！ -  providers> 
< provider invariantName =System.Data.SqlClienttype =System.Data.Entity.SqlServer.SqlProviderServices，EntityFramework.SqlServer/> 
< / providers  - > 
< / entityFramework> 
< connectionStrings> 
< add name =FbMultipleInsOrderContainerconnectionString =metadata = res：//*/FbMultipleInsOrder.csdl | res：//*/FbMultipleInsOrder.ssdl | res：//*/FbMultipleInsOrder.msl; provider = System .Data.SqlServerCe.4.0; provider connection string =& quot; data source = | DataDirectory | \FBMultipleOrderSync.sdf& quot; providerName =System.Data.EntityClient/> 
< / connectionStrings> 
 ... 
  

我试过重新安装EF 6.但没有效果。

这方面的任何线索都会非常明显。

解决方案

安装 nuget包，检查您的app.config是否包含以下内容（根据@ ErikEJ的上面的注释）：

 < providers> 
< provider invariantName =System.Data.SqlClienttype =System.Data.Entity.SqlServer.SqlProviderServices，EntityFramework.SqlServer/> 
< provider invariantName =System.Data.SqlServerCe.4.0type =System.Data.Entity.SqlServerCompact.SqlCeProviderServices，EntityFramework.SqlServerCompact/> 
< / providers> 
  

（你可以离开SqlClient的行，即使你不需要它。）

I got the following error when I used sqlce 4.0 with entityframework 6.0

No Entity Framework provider found for the ADO.NET provider with invariant name 'System.Data.SqlServerCe.4.0'

My app.config looks like this

....
<configSections>
    <section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" requirePermission="false" />
    <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
    <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
  <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 --></configSections>
 <entityFramework>
    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework" >
      <parameters>
        <parameter value =" System.Data.SqlServerCe.4.0" />
      </parameters>
    </defaultConnectionFactory>
    <!--providers>
      <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
    </providers-->
  </entityFramework>
  <connectionStrings>
    <add name="FbMultipleInsOrderContainer" connectionString="metadata=res://*/FbMultipleInsOrder.csdl|res://*/FbMultipleInsOrder.ssdl|res://*/FbMultipleInsOrder.msl;provider=System.Data.SqlServerCe.4.0;provider connection string=&quot;data source=|DataDirectory|\FBMultipleOrderSync.sdf&quot;" providerName="System.Data.EntityClient" />
  </connectionStrings>
...

I tried re-installing EF 6. But no avail.

Any clue on this would be much appreciable.

解决方案

After installing the EntityFramework.SqlServerCompact nuget package, check that your app.config contains the following (as per @ErikEJ's comment above):

<providers>
  <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
  <provider invariantName="System.Data.SqlServerCe.4.0" type="System.Data.Entity.SqlServerCompact.SqlCeProviderServices, EntityFramework.SqlServerCompact" />
</providers>

(You can leave the line for SqlClient even though you don't really need it.)

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