当模型发生变化时，WebAPI 2中的EF标识停止工作

问题描述：

我想使用Android/iOS可以使用的Web服务在Angular中构建网站。我终于找到了一个很棒的教程，帮助我设置了这个教程。下一步是扩展身份模型。所以，我添加了一个属性。然后，我开始得到一个异常：。当模型发生变化时，WebAPI 2中的EF标识停止工作

“的模式支持了‘AuthContext’语境自创建数据库时改变考虑使用代码首先迁移到更新数据库（http://go.microsoft.com/fwlink/?LinkId=238269）

所以，当我遵守这些指示，我得到这个：

Enable-Migrations 
Exception calling "LoadFrom" with "1" argument(s): "Could not load file or assembly 'file:///C:\copa\AngularJSAuthentication-master\packages\EntityFramework.6.1.0\tools\EntityFramework.PowerShell. 
Utility.dll' or one of its dependencies. Operation is not supported. (Exception from HRESULT: 0x80131515)" 
At C:\copa\AngularJSAuthentication-master\packages\EntityFramework.6.1.0\tools\EntityFramework.psm1:780 char:62 
+  $utilityAssembly = [System.Reflection.Assembly]::LoadFrom <<<< ((Join-Path $ToolsPath EntityFramework.PowerShell.Utility.dll)) 
    + CategoryInfo   : NotSpecified: (:) [], MethodInvocationException 
    + FullyQualifiedErrorId : DotNetMethodException 

You cannot call a method on a null-valued expression. 
At C:\copa\AngularJSAuthentication-master\packages\EntityFramework.6.1.0\tools\EntityFramework.psm1:781 char:50 
+  $dispatcher = $utilityAssembly.CreateInstance <<<< (
    + CategoryInfo   : InvalidOperation: (CreateInstance:String) [], RuntimeException 
    + FullyQualifiedErrorId : InvokeMethodOnNull 

Exception calling "CreateInstanceFrom" with "8" argument(s): "Could not load file or assembly 'file:///C:\copa\AngularJSAuthentication-master\packages\EntityFramework.6.1.0\tools\EntityFramework.P 
owerShell.dll' or one of its dependencies. Operation is not supported. (Exception from HRESULT: 0x80131515)" 
At C:\copa\AngularJSAuthentication-master\packages\EntityFramework.6.1.0\tools\EntityFramework.psm1:809 char:31 
+  $domain.CreateInstanceFrom <<<< (
    + CategoryInfo   : NotSpecified: (:) [], MethodInvocationException 
    + FullyQualifiedErrorId : DotNetMethodException 

PM> Enable-Migrations -ContextTypeName AngularJSAuthentication.API.AuthContext 
The project 'AngularJSAuthentication.API' failed to build. 
PM> Enable-Migrations -ContextTypeName AngularJSAuthentication.API.AuthContext 
Exception calling "LoadFrom" with "1" argument(s): "Could not load file or assembly 'file:///C:\copa\AngularJSAuthentication-master\packages\EntityFramework.6.1.0\tools\EntityFramework.PowerShell. 
Utility.dll' or one of its dependencies. Operation is not supported. (Exception from HRESULT: 0x80131515)" 
At C:\copa\AngularJSAuthentication-master\packages\EntityFramework.6.1.0\tools\EntityFramework.psm1:780 char:62 
+  $utilityAssembly = [System.Reflection.Assembly]::LoadFrom <<<< ((Join-Path $ToolsPath EntityFramework.PowerShell.Utility.dll)) 
    + CategoryInfo   : NotSpecified: (:) [], MethodInvocationException 
    + FullyQualifiedErrorId : DotNetMethodException 

You cannot call a method on a null-valued expression. 
At C:\copa\AngularJSAuthentication-master\packages\EntityFramework.6.1.0\tools\EntityFramework.psm1:781 char:50 
+  $dispatcher = $utilityAssembly.CreateInstance <<<< (
    + CategoryInfo   : InvalidOperation: (CreateInstance:String) [], RuntimeException 
    + FullyQualifiedErrorId : InvokeMethodOnNull 

Exception calling "CreateInstanceFrom" with "8" argument(s): "Could not load file or assembly 'file:///C:\copa\AngularJSAuthentication-master\packages\EntityFramework.6.1.0\tools\EntityFramework.P 
owerShell.dll' or one of its dependencies. Operation is not supported. (Exception from HRESULT: 0x80131515)" 
At C:\copa\AngularJSAuthentication-master\packages\EntityFramework.6.1.0\tools\EntityFramework.psm1:809 char:31 
+  $domain.CreateInstanceFrom <<<< (
    + CategoryInfo   : NotSpecified: (:) [], MethodInvocationException 
    + FullyQualifiedErrorId : DotNetMethodException 

PM> Enable-Migrations 
Exception calling "LoadFrom" with "1" argument(s): "Could not load file or assembly 'file:///C:\copa\AngularJSAuthentication-master\packages\EntityFramework.6.1.0\tools\EntityFramework.PowerShell. 
Utility.dll' or one of its dependencies. Operation is not supported. (Exception from HRESULT: 0x80131515)" 
At C:\copa\AngularJSAuthentication-master\packages\EntityFramework.6.1.0\tools\EntityFramework.psm1:780 char:62 
+  $utilityAssembly = [System.Reflection.Assembly]::LoadFrom <<<< ((Join-Path $ToolsPath EntityFramework.PowerShell.Utility.dll)) 
    + CategoryInfo   : NotSpecified: (:) [], MethodInvocationException 
    + FullyQualifiedErrorId : DotNetMethodException

我已经改变了我的初始化器在启动（注释表明它是什么）

Database.SetInitializer<AuthContext>(null);// <AuthContext>());//, AngularJSAuthentication.API.Migrations.Configuration>());

并在上下文类静态构造函数（这个组合是我在另一个项目中所做的那样）

static AuthContext() 
    { 
     Database.SetInitializer<AuthContext>(new AuthContextInitialiser()); 
    }

我很茫然，我GOOGLE了，但我看到的解决方案，不似乎工作。 VS正在以管理员身份运行。我只是想EF不关心我的数据库，并相信我，它应该是这样...

其实，如果我告诉它取代我的数据库（我不喜欢），我得到这个错误：

Unable to update database to match the current model because there are pending changes and automatic migration is disabled. Either write the pending model changes to a code-based migration or enable automatic migration. Set DbMigrationsConfiguration.AutomaticMigrationsEnabled to true to enable automatic migration

没有，只是留下我一个人相信我能管理自己的数据库路径...

感谢

有人可以告诉我，我”米做错了吗？没有人回答我.... – cgraus

答

此异常和HResult的代码来，如果有一个安全限制防止组件被加载。

的常见原因：

网络共享或驱动器：将文件复制到硬盘
DLL从其他机器复制：右键单击并解锁

当模型发生变化时，WebAPI 2中的EF标识停止工作

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