entity-framework - 带有 Entity Framework 的 Azure 函数

Question

我用 project.json导入 EntityFramework 6.1.3 NuGet 包。我可以确认 NuGet 包已在我的函数应用中成功还原。

根据document ，我可以直接使用EntityFramework。但是，我不断收到错误消息，例如:

ManualTriggerCSharp1: Could not load file or assembly 'EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' or one of its dependencies. The system cannot find the file specified.

我的函数似乎无法正确加载 EntityFramework dll。即使我复制了 EntityFramework.dll和 EntityFramework.SqlServer.dll进bin目录，它仍然提示同样的异常。

我错过了什么？

更新

这是我的 project.json文件:

{
  "frameworks": {
    "net46":{
      "dependencies": {
        "Autofac": "4.2.0",
        "AutoMapper": "5.1.1",
        "EntityFramework": "6.1.3",
        "Newtonsoft.Json": "9.0.1"
      }
    }
   }
}

正如我上面提到的，这是行不通的。所以，我手动复制了 EntityFramework.dll和 EntityFramework.SqlServer.dll进bin目录并在 run.csx 中引用它文件如:

#r "EntityFramework.dll"
#r "EntityFramework.SqlServer.dll"

但是还在提示。整行日志消息是:

2016-11-18T20:22:46.296 Exception while executing function: Functions.ManualTriggerCSharp1. mscorlib: Exception has been thrown by the target of an invocation. ManualTriggerCSharp1: Could not load file or assembly 'EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' or one of its dependencies. The system cannot find the file specified.

更新 2

这是我的完整功能代码:

#r "Tournaments.EntityModels.dll"

using System;
using System.Configuration;

using Tournaments.EntityModels;

public static void Run(string input, TraceWriter log)
{
    log.Info($"C# manually triggered function called with input: {input}");

    var connString = ConfigurationManager.ConnectionStrings["TournamentDbContext"].ConnectionString;
    var dbContext = new TournamentDbContext(connString);
    var numberOfPlayers = dbContext.Players.ToList().Count;

    log.Info($"Number of Players: {numberOfPlayers}");
}

请注意 Tournaments.EntityModels.dll是实际的数据库实体模型。这是我的 project.json :

{
  "frameworks": {
    "net46": {
      "dependencies": {
        "EntityFramework": "6.1.3"
      }
    }
  }
}

我能够编译该函数。根本没有问题。问题发生在运行时。当我运行此函数时，出现错误:

2016-11-19T00:52:40.818 Function started (Id=c03af3f2-38f5-4df9-9bc5-b5932c365c04)

2016-11-19T00:52:40.818 Function completed (Failure, Id=c03af3f2-38f5-4df9-9bc5-b5932c365c04)

2016-11-19T00:52:40.836 Exception while executing function: Functions.ManualTriggerCSharp3. mscorlib: Exception has been thrown by the target of an invocation. ManualTriggerCSharp3: Could not load file or assembly 'EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' or one of its dependencies. The system cannot find the file specified.

我查看了 KUDU 中的日志，并从日志流中找到了这个:

2016-11-19T01:00:25.454 Executing: 'Functions.ManualTriggerCSharp3' - Reason: 'This function was programmatically called via the host APIs.'

2016-11-19T01:00:25.649 Function started (Id=b18b45a7-83a8-453e-a337-955e6a4a5117)

2016-11-19T01:00:25.649 Function completed (Failure, Id=b18b45a7-83a8-453e-a337-955e6a4a5117)

2016-11-19T01:00:25.649 A ScriptHost error has occurred

2016-11-19T01:00:25.649 Could not load file or assembly 'EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' or one of its dependencies. The system cannot find the file specified.

2016-11-19T01:00:25.649 Function started (Id=b18b45a7-83a8-453e-a337-955e6a4a5117)

2016-11-19T01:00:25.649 Function completed (Failure, Id=b18b45a7-83a8-453e-a337-955e6a4a5117)

2016-11-19T01:00:25.665 Exception while executing function: Functions.ManualTriggerCSharp3. mscorlib: Exception has been thrown by the target of an invocation. ManualTriggerCSharp3: Could not load file or assembly 'EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' or one of its dependencies. The system cannot find the file specified.

2016-11-19T01:00:25.665 Exception while executing function: Functions.ManualTriggerCSharp3. mscorlib: Exception has been thrown by the target of an invocation. ManualTriggerCSharp3: Could not load file or assembly 'EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' or one of its dependencies. The system cannot find the file specified.

2016-11-19T01:00:25.681 Exception while executing function: Functions.ManualTriggerCSharp3

2016-11-19T01:00:25.696 Could not load file or assembly 'EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' or one of its dependencies. The system cannot find the file specified.

2016-11-19T01:00:25.696 Executed: 'Functions.ManualTriggerCSharp3' (Failed)

2016-11-19T01:00:25.696 Could not load file or assembly 'EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' or one of its dependencies. The system cannot find the file specified.

2016-11-19T01:00:25.696 Function had errors. See Azure WebJobs SDK dashboard for details. Instance ID is 'b18b45a7-83a8-453e-a337-955e6a4a5117'

2016-11-19T01:00:25.696 Could not load file or assembly 'EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' or one of its dependencies. The system cannot find the file specified.

这是来自函数日志的堆栈跟踪消息:

...obs.Script.Description.FunctionInvokerBase.d__23.MoveNext()

--- End of stack trace from previous location where exception was thrown ---

at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)

at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)

at Microsoft.Azure.WebJobs.Host.Executors.FunctionInvoker`1.d__0.MoveNext()

--- End of stack trace from previous location where exception was thrown ---

at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)

at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)

at Microsoft.Azure.WebJobs.Host.Executors.FunctionExecutor.d__53.MoveNext()

--- End of stack trace from previous location where exception was thrown ---

at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)

at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)

at Microsoft.Azure.WebJobs.Host.Executors.FunctionExecutor.d__3b.MoveNext()

--- End of stack trace from previous location where exception was thrown ---

at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)

at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)

at Microsoft.Azure.WebJobs.Host.Executors.FunctionExecutor.d__36.MoveNext()

--- End of stack trace from previous location where exception was thrown ---

at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)

at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)

at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task)

at Microsoft.Azure.WebJobs.Host.Executors.FunctionExecutor.d__1a.MoveNext()

--- End of inner exception stack trace ---

我想我可以在这里提供所有必要的信息。你能给我一个建议吗？

Answer 1

以下步骤适用于最新的 Functions 运行时 (1.0)。创建一个新函数(例如 ManualTrigger)，并使用“查看文件”UI 添加一个新的 project.json包含以下内容的文件:

{
  "frameworks": {
    "net46":{
      "dependencies": {
        "EntityFramework": "6.1.3"
      }
    }
   }
}

保存文件后，您应该会在功能日志窗口中看到包恢复，例如:

2016-11-18T16:50:05.772 Starting NuGet restore
2016-11-18T16:50:06.991 Restoring packages for D:\home\site\wwwroot\ManualTriggerCSharp2\project.json...
2016-11-18T16:50:07.553 Committing restore...
2016-11-18T16:50:07.569 Writing lock file to disk. Path: D:\home\site\wwwroot\ManualTriggerCSharp2\project.lock.json
2016-11-18T16:50:07.620 D:\home\site\wwwroot\ManualTriggerCSharp2\project.json
2016-11-18T16:50:07.620 Restore completed in 645ms.
2016-11-18T16:50:07.631 
2016-11-18T16:50:07.631 NuGet Config files used:
2016-11-18T16:50:07.631 C:\DWASFiles\Sites\function-fun\AppData\NuGet\NuGet.Config
2016-11-18T16:50:07.631 
2016-11-18T16:50:07.631 Feeds used:
2016-11-18T16:50:07.631 https://api.nuget.org/v3/index.json
2016-11-18T16:50:07.662 
2016-11-18T16:50:07.662 
2016-11-18T16:50:07.709 Packages restored.

之后，您可以简单地将 EF using 语句添加到您的代码中，它将成功编译:

using System;
using System.Data.Entity;
using System.Data.Entity.Infrastructure;
using System.Data.Entity.Core.Objects;
using System.Linq;

public static void Run(string input, TraceWriter log)
{
    log.Info($"C# manually triggered function called with input: {input}");
}