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我有一个 MVC 4 项目（Company.Project.WebUI），一个用于我所有模型类的项目（Company.Project.Data）和一个用于 DAL 的项目（Company.Project.Services）。

如何使用 Code First 迁移来管理它？

编写命令时出现以下错误Add-Migration Init：

`

System.Reflection.ReflectionTypeLoadException: Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information.
   at System.Reflection.RuntimeModule.GetTypes(RuntimeModule module)
   at System.Reflection.RuntimeModule.GetTypes()
   at System.Reflection.Assembly.GetTypes()
   at System.Data.Entity.Migrations.Design.ToolingFacade.BaseRunner.FindConfiguration()
   at System.Data.Entity.Migrations.Design.ToolingFacade.BaseRunner.GetMigrator()
   at System.Data.Entity.Migrations.Design.ToolingFacade.GetPendingMigrationsRunner.RunCore()
   at System.Data.Entity.Migrations.Design.ToolingFacade.BaseRunner.Run()

`

当我写命令时，Add-Migration -StartUpProjectName "Company.Project.Services" Init我也会得到一个错误

`

System.IO.FileNotFoundException: Could not load file or assembly 'Company.Project.WebUI' or one of its dependencies. The system cannot find the file specified.
File name: 'Company.Project.WebUI'
   at System.Reflection.RuntimeAssembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)
   at System.Reflection.RuntimeAssembly.nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks)
   at System.Reflection.RuntimeAssembly.InternalLoadAssemblyName(AssemblyName assemblyRef, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection, Boolean suppressSecurityChecks)
   at System.Reflection.RuntimeAssembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection)
   at System.Reflection.Assembly.Load(String assemblyString)
   at System.Data.Entity.Migrations.Design.ToolingFacade.BaseRunner.FindConfiguration()
   at System.Data.Entity.Migrations.Design.ToolingFacade.BaseRunner.GetMigrator()
   at System.Data.Entity.Migrations.Design.ToolingFacade.GetPendingMigrationsRunner.RunCore()
   at System.Data.Entity.Migrations.Design.ToolingFacade.BaseRunner.Run()

`

有人可以告诉我将 EF Code First Migration 与不同的 dll 一起使用的最佳方法是什么？

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1 回答 1

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我不知道为什么，但 EF 希望将您的 DAL 项目设置为 Visual Studio 中的启动项目。我只是遇到了同样的错误，这解决了问题。

在解决方案资源管理器上：右键单击您的 DAL 项目 -> 选择“设置为启动项目”。

于 2012-08-07T07:28:33.410 回答