如何在 Raspberry pi 2(Mono 4 + ARM proc)上部署 npgsql? [英] how to deploy npgsql on Raspberry pi 2 (Mono 4 + ARM proc)?

问题描述

我使用 Visual Studio 2013 (Windows) 构建一个使用 Npgsql 和实体框架 6 的小型 .NET 4.5 应用程序.

I use Visual studio 2013 (Windows) to build a small .NET 4.5 application using Npgsql and Entity Framework 6.

在 Windows 上它运行良好.但是在 Raspbian 上，应用程序崩溃说它找不到 npgsql 提供程序.

On windows it just works fine. But on Raspbian, the app crash saying it cannot find npgsql provider.

   Unhandled Exception:
System.Configuration.ConfigurationErrorsException: Failed to find or load the registered .Net Framework Data Provider 'Npgsql'.
  at System.Data.Common.DbProviderFactories.GetFactory (System.String providerInvariantName) [0x00000] in <filename unknown>:0
[...]

在我的树莓派 2 上.

On my raspberry pi 2.

我已经手动安装了 Mono v4.0.2

I have manually installed Mono v4.0.2

我复制了我的应用，包括:

I have copied my app including:

npgsql.dll v2.2.5.0

npgsql.dll v2.2.5.0

npgsql.entityframework 相同版本

npgsql.entityframework same version

mono.security v4.0.2

mono.security v4.0.2

我的 app.config 包含:

and my app.config contains :

  <?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=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
  </configSections>
  <entityFramework>
    <providers>
            <provider invariantName="Npgsql" type="Npgsql.NpgsqlServices, Npgsql.EntityFramework" />
    </providers>
  </entityFramework>
  <connectionStrings>
    <add name="minitestEntities" connectionString="metadata=res://*/Model2.csdl|res://*/Model2.ssdl|res://*/Model2.msl;provider=Npgsql;provider connection string=&quot;PORT=5432;TIMEOUT=15;POOLING=True;MINPOOLSIZE=1;MAXPOOLSIZE=20;COMMANDTIMEOUT=20;COMPATIBLE=2.2.5.0;DATABASE=minitest;HOST=10.0.0.1;INTEGRATED SECURITY=True;PASSWORD=azerty;USER ID=theuser&quot;" providerName="System.Data.EntityClient" />
  </connectionStrings>
</configuration>

所以我想知道 npgsql 库是否正确加载，或者是否缺少引用.

So i'm wondering if npgsql librairies are correctly loaded, or a if a reference is missing.

我没有找到有关如何在最近的单声道 + ARM 环境中使用 npgsql 的文档.任何有关这方面的信息将不胜感激.

I found no docs on how to use npgsql on recent mono + ARM environment. Any info about this would be really appreciated.

推荐答案

好的，我在其他讨论中找到了解决方案.与此同时，我忘了记下它的 URL，所以这里的答案是:

ok i found the solution in an other discution. In the meanwhile i forgot to note its URL so here the answer :

我们必须手动将提供者描述添加到 app.config 中:

We have to add manually the provider description into app.config :

<system.data>
  <DbProviderFactories>
    <add name="Npgsql Data Provider" 
         invariant="Npgsql" 
         support="FF" 
         description=".Net Framework Data Provider for Postgresql Server" 
         type="Npgsql.NpgsqlFactory, Npgsql, Version=2.2.5.0, Culture=neutral, PublicKeyToken=5d8b90d52f46fda7" />
  </DbProviderFactories>
</system.data>

版本和 PuclicKeyToken 必须与 npgsql.dll 匹配.要获取公钥令牌，您可以运行该代码:

The version and PuclicKeyToken MUST match with npgsql.dll. To get the public key token, you can run that code :

typeof(Npgsql.NpgsqlFactory).AssemblyQualifiedName

现在我不知道为什么这一步在 windows 中不是必需的，但在 linux 中必须要做...

Now i have no idea why this step is not necessary into windows, but a have to do into linux...

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