启用迁移不适用于具有现有数据库配置的项目

Question

我正在尝试运行 Enable-Migrations cmd-let 在具有现有数据库配置的解决方案中，但无论我尝试哪种选项组合，我都会收到以下错误：

Exception calling "LoadFrom" with "1" argument(s): "Invalid directory on URL."
At my-project\packages\EntityFramework.6.1.3\tools\EntityFramework.psm1:780 char:5
+     $utilityAssembly = [System.Reflection.Assembly]::LoadFrom((Join-Path $ToolsP ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : ArgumentException

You cannot call a method on a null-valued expression.
At my-project\packages\EntityFramework.6.1.3\tools\EntityFramework.psm1:781 char:5
+     $dispatcher = $utilityAssembly.CreateInstance(
+     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : InvalidOperation: (:) [], RuntimeException
    + FullyQualifiedErrorId : InvokeMethodOnNull

Exception calling "CreateInstanceFrom" with "8" argument(s): "Invalid directory on URL."
At my-project\packages\EntityFramework.6.1.3\tools\EntityFramework.psm1:809 char:5
+     $domain.CreateInstanceFrom(
+     ~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : ArgumentException

解决方案的结构如下：

Foo.sln
┖─ DbCreator (command line program, transfers data from an old db)
┖─ Foo.Api (WebAPI project, default startup project)
┖─ Foo.Repository (Contains entities and DbContext)
┖─ other utility and test projects

我想做的是查看 Foo.Repository 中的 DbContext（解决方案中唯一的一个），并允许迁移到 DbCreator 项目，所以每次我运行 exe 时我都可以运行迁移。

我正在使用 VS 2015 和 EF 6.1.3。

Answer 1

这是一个已知问题，解决方法请查看 1950#issue

启用迁移不适用于具有现有数据库配置的项目

Enable-Migrations not working in project with existing db configurations

entity-framework-migrations

entity-framework-6