使用 SQL CE 的 ABP 样板

Question

我有一个简单的 ASP.NET 应用程序，它使用 EntityFramework 和一个 SQL 服务器 EF 数据库。

问题是，如果我尝试使用 SQL CE（精简版），我的应用程序服务会在第二次调用存储库时抛出异常并显示错误：

ExecuteReader 需要一个打开且可用的连接。

如果我 return 到 SQL Express 数据库，一切都会成功。

这里是我使用的步骤和代码：

对客户端应用程序 App.config 文件的修改（我只报告更改）：

<!-- language: lang-xml -->
<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <configSections>
    <section name="entityFramework" .../>
  </configSections>
  <connectionStrings>
    <add name="Default" providerName="System.Data.SqlServerCe.4.0" connectionString="Data Source=C:\temp\Deeds.sdf" />**
  </connectionStrings>
  ...
  <entityFramework>
    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlCeConnectionFactory, 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" />
      <provider invariantName="System.Data.SqlServerCe.4.0" type="System.Data.Entity.SqlServerCompact.SqlCeProviderServices, EntityFramework.SqlServerCompact" />
    </providers>
  </entityFramework>
  <system.data>
    <DbProviderFactories>
      <remove invariant="System.Data.SqlServerCe.4.0" />
      <add name="Microsoft SQL Server Compact Data Provider 4.0" invariant="System.Data.SqlServerCe.4.0" description=".NET Framework Data Provider for Microsoft SQL Server Compact" type="System.Data.SqlServerCe.SqlCeProviderFactory, System.Data.SqlServerCe, Version=4.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91" />
    </DbProviderFactories>
  </system.data>
  ...
</configuration>

我必须设置 UOW 的隔离级别：

public class DeedsWinFormEFModule : AbpModule {

    public override void PreInitialize() {
        Configuration.UnitOfWork.IsolationLevel = System.Transactions.IsolationLevel.ReadCommitted;
    }

    public override void Initialize() {
        IocManager.RegisterAssemblyByConvention(Assembly.GetExecutingAssembly());
    }
}

但在我的 ApplicationService 中，此方法在第二次数据库查询时失败

public class DeedImmobileAppService
    : DeedsAppServiceBase, IDeedImmobileAppService {

    protected readonly IRepository<CfgBase100Repo> _cfgBase100Repo;
    protected readonly IRepository<CfgCasa> _cfgCasaRepo;

...

    public async Task<IReadOnlyList<DeedEntryDto>> CalculateValuesForEntries(UpdateDefaultEntriesRequest input) {
        var tipoCasa = await _cfgCasaRepo.FirstOrDefaultAsync(input.HouseTypeId);
        var base100 = await _cfgBase100Repo.FirstOrDefaultAsync(cfg => (cfg.MinDeedRange <= input.DeedValue) && (input.DeedValue < cfg.MaxDeedRange));
        ...
        return list;
    }
}

对存储库的第二次调用总是失败 (var tipoCasa = ...):

    var base100 = await _cfgBase100Repo.FirstOrDefaultAsync(cfg => (cfg.MinDeedRange <= input.DeedValue) && (input.DeedValue < cfg.MaxDeedRange));
    var tipoCasa = await _cfgCasaRepo.FirstOrDefaultAsync(input.HouseTypeId);

我也试过把台词倒过来。在这种情况下 var base100 = 失败：

    var tipoCasa = await _cfgCasaRepo.FirstOrDefaultAsync(input.HouseTypeId);
    var base100 = await _cfgBase100Repo.FirstOrDefaultAsync(cfg => (cfg.MinDeedRange <= input.DeedValue) && (input.DeedValue < cfg.MaxDeedRange));

我收到的错误是：

Inner Exception 1:
EntityCommandExecutionException: An error occurred while executing the command definition. See the inner exception for details.

Inner Exception 2:
InvalidOperationException: ExecuteReader requires an open and available Connection. The connection's current state is Closed.

这里是堆栈跟踪：

System.Reflection.TargetInvocationException HResult=0x80131604
Message=Exception has been thrown by the target of an invocation.
Source=mscorlib StackTrace: at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor) at System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments) at System.Delegate.DynamicInvokeImpl(Object[] args) at System.Windows.Forms.Control.InvokeMarshaledCallbackDo(ThreadMethodEntry tme) at System.Windows.Forms.Control.InvokeMarshaledCallbackHelper(Object obj) at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Windows.Forms.Control.InvokeMarshaledCallback(ThreadMethodEntry tme) at System.Windows.Forms.Control.InvokeMarshaledCallbacks()
at System.Windows.Forms.Control.WndProc(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m) at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam) at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData) at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context) at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context) at System.Windows.Forms.Application.Run(Form mainForm) at GPSoftware.Deeds.WinForm.Program.Main() in C:\WA\GPse\NotuleNotai\Notule\Deeds.WinForm\Program.cs:line 34

内部异常 1:

EntityCommandExecutionException: An error occurred while executing the command definition. See the inner exception for details.

内部异常 2:

InvalidOperationException: ExecuteReader requires an open and available Connection. The connection's current state is Closed.

Answer 1

我不确定这是正确的解决方案，但我通过 将 UOW 标记为非事务性 :

解决了这个问题

[DependsOn(
    typeof(DeedsDataModule),
    typeof(DeedsApplicationModule))]
public class DeedsWinFormEFModule : AbpModule {

    public override void PreInitialize() {
        // Configuration.UnitOfWork.IsolationLevel = System.Transactions.IsolationLevel.ReadCommitted;  // <= this is not needed!
        Configuration.UnitOfWork.IsTransactional = false; // <= solution!
    }

    public override void Initialize() {
        IocManager.RegisterAssemblyByConvention(Assembly.GetExecutingAssembly());
    }
}

更新

这是正确的解决方案：EF 不支持 SQL CE 事务，因为 TransactionScope 在使用 SQL CE 时会导致升级到分布式事务使用 Code First 和 SQL CE 不支持分布式事务。

使用 SQL CE 的 ABP 样板

ABP Boilerplate using SQL CE

sql-server-ce

asp.net-boilerplate

aspnetboilerplate