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我想使用Android/iOS可以使用的Web服務在Angular中構建網站。我終於找到了一個很棒的教程，幫助我設置了這個教程。下一步是擴展身份模型。所以，我添加了一個屬性。然後，我開始得到一個異常：。當模型發生變化時，WebAPI 2中的EF標識停止工作
「的模式支持了‘AuthContext’語境自創建數據庫時改變考慮使用代碼首先遷移到更新數據庫（http://go.microsoft.com/fwlink/?LinkId=238269）
所以，當我遵守這些指示，我得到這個：
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
我已經改變了我的初始化器在啓動（註釋表明它是什麼）
Database.SetInitializer<AuthContext>(null);// <AuthContext>());//, AngularJSAuthentication.API.Migrations.Configuration>());
並在上下文類靜態構造函數（這個組合是我在另一個項目中所做的那樣）
static AuthContext()
{
Database.SetInitializer<AuthContext>(new AuthContextInitialiser());
}
我很茫然，我GOOGLE了，但我看到的解決方案，不似乎工作。 VS正在以管理員身份運行。我只是想EF不關心我的數據庫，並相信我，它應該是這樣...
其實，如果我告訴它取代我的數據庫（我不喜歡），我得到這個錯誤：
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
沒有，只是留下我一個人相信我能管理自己的數據庫路徑...
感謝
有人可以告訴我，我」米做錯了嗎？沒有人回答我.... – cgraus