我在使用实体框架4.3的Code First迁移越来越几个未处理的异常。
I'm getting several unhandled exceptions while using Code First Migrations of Entity Framework 4.3.
数据库方面：
public class MyAppContext : DbContext { public DbSet<Branch> Branches { get; set; } public MyAppContext() { } }实体：
public class Branch : IEntity<Guid> { public Guid Id { get; set; } public string Name { get; set; } public string Description { get; set; } public bool Active { get; set; } }
数据库初始化：
The database initializer:
public class MyAppInitializer : CreateDatabaseIfNotExists<MyAppContext> { protected override void Seed(MyAppContext context) { context.Branches.Add(new Branch() { Id = branchId, Name = "Acme", Description = "Acme", Active = true }); context.SaveChanges(); } }
我安装实体框架4.3到我的DAL项目和MVC使用项目：
I installed Entity Framework 4.3 to my DAL project and MVC project using:
安装封装的EntityFramework
Install-Package EntityFramework
我已经设置了MVC项目为启动项目并执行以下命令来与数据库环境和初始化的DAL项目：
I have set the MVC project as the startup project and executed the following command to the DAL project with the database context and initializer:
PM>启用的迁移-Verbose
PM> Enable-Migrations -Verbose
使用的NuGet项目的Ckms.KeyManagement.Managers。 错误，同时寻找上下文类型（指定-Verbose看到异常详细信息）。 System.Data.Entity.Migrations.Design.ToolingException：无法加载请求的类型的一个或多个。获取更多信息，LoaderExceptions财产。在在 System.Data.Entity.Migrations.Design.ToolingFacade.GetContextTypes System.Data.Entity.Migrations.Design.ToolingFacade.Run（跑垒员亚军）（）结果$在 System.Data.Entity.Migrations.MigrationsCommands.FindContextToEnable（）编辑生成的配置b类$ b指定上下文启用迁移。 码首先迁移项目Ckms.KeyManagement.Managers启用。
Using NuGet project 'Ckms.KeyManagement.Managers'. Error while searching for context type (specify -Verbose to see exception details). System.Data.Entity.Migrations.Design.ToolingException: Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information. at System.Data.Entity.Migrations.Design.ToolingFacade.Run(BaseRunner runner) at System.Data.Entity.Migrations.Design.ToolingFacade.GetContextTypes() at System.Data.Entity.Migrations.MigrationsCommands.FindContextToEnable() Edit the generated Configuration class to specify the context to enable migrations for. Code First Migrations enabled for project Ckms.KeyManagement.Managers.
一个DbMigrationsConfiguration子类添加到项目DAL。如果我手动添加的DbContext的类型，并启用自动迁移：
A DbMigrationsConfiguration child class is added to the DAL project. If I add the type of the DbContext manually and enable Automatic Migrations:
internal sealed class Configuration : DbMigrationsConfiguration<MyAppContext> { public Configuration() { AutomaticMigrationsEnabled = true; } protected override void Seed(MyAppContext context) { } }这些异常抛出外接迁移和更新，数据库命令：
These exceptions are thrown for the Add-Migration and Update-Database commands:
PM>添加迁移TestEFMigrationsColumn -Verbose
PM> Add-Migration TestEFMigrationsColumn -Verbose
使用的NuGet项目'Ckms.KeyManagement.Managers。使用启动项目'。 System.Reflection.TargetInvocationException：异常已被调用的目标引发异常。 ---> System.ArgumentException：在参数不正确。 （异常来自HRESULT：80070057 （E_INVALIDARG））---内部异常堆栈跟踪的结尾---在 System.RuntimeType.InvokeDispMethod（字符串名称，的BindingFlags invokeAttr，对象目标， [对象]在 System.RuntimeType.InvokeMember ARGS，布尔[] byrefModifiers，的Int32文化的String [] namedParameters）（字符串名称，的BindingFlags 的BindingFlags，活页夹粘结剂，目标对象，对象[] providedArgs， ParameterModifier []修饰符，CultureInfo的文化的String [] namedParams）在 System.Management.Automation.ComMethod.InvokeMethod（PSMethod方法，对象[] 。参数）异常已由调用的目标引发异常
Using NuGet project 'Ckms.KeyManagement.Managers'. Using StartUp project ''. System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.ArgumentException: The parameter is incorrect. (Exception from HRESULT: 0x80070057 (E_INVALIDARG)) --- End of inner exception stack trace --- at System.RuntimeType.InvokeDispMethod(String name, BindingFlags invokeAttr, Object target, Object[] args, Boolean[] byrefModifiers, Int32 culture, String[] namedParameters) at System.RuntimeType.InvokeMember(String name, BindingFlags bindingFlags, Binder binder, Object target, Object[] providedArgs, ParameterModifier[] modifiers, CultureInfo culture, String[] namedParams) at System.Management.Automation.ComMethod.InvokeMethod(PSMethod method, Object[] arguments) Exception has been thrown by the target of an invocation.
更新 - 数据库：
PM>更新，数据库-Verbose
PM> Update-Database -Verbose
使用的NuGet项目'Ckms.KeyManagement。经理人。使用启动项目'。 System.Reflection.TargetInvocationException：异常已被调用的目标引发异常。 ---> System.ArgumentException：在参数不正确。 （异常来自HRESULT：80070057 （E_INVALIDARG））---内部异常堆栈跟踪的结尾---在 System.RuntimeType.InvokeDispMethod（字符串名称，的BindingFlags invokeAttr，对象目标， [对象]在 System.RuntimeType.InvokeMember ARGS，布尔[] byrefModifiers，的Int32文化的String [] namedParameters）（字符串名称，的BindingFlags 的BindingFlags，活页夹粘结剂，目标对象，对象[] providedArgs， ParameterModifier []修饰符，CultureInfo的文化的String [] namedParams）在 System.Management.Automation.ComMethod.InvokeMethod（PSMethod方法，对象[]参数）异常已由调用的目标引发异常。
Using NuGet project 'Ckms.KeyManagement.Managers'. Using StartUp project ''. System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.ArgumentException: The parameter is incorrect. (Exception from HRESULT: 0x80070057 (E_INVALIDARG)) --- End of inner exception stack trace --- at System.RuntimeType.InvokeDispMethod(String name, BindingFlags invokeAttr, Object target, Object[] args, Boolean[] byrefModifiers, Int32 culture, String[] namedParameters) at System.RuntimeType.InvokeMember(String name, BindingFlags bindingFlags, Binder binder, Object target, Object[] providedArgs, ParameterModifier[] modifiers, CultureInfo culture, String[] namedParams) at System.Management.Automation.ComMethod.InvokeMethod(PSMethod method, Object[] arguments) Exception has been thrown by the target of an invocation.
任何想法？错误消息是不是真的有帮助。我曾尝试的NuGet使用和不使用现有的数据库命令。
Any ideas? The error messages are not really helpful. I have tried the Nuget commands with and without an existing database.
推荐答案如果您正在使用的数据访问单独的库需要提供运行的查询时，它的名字：
If you are using separate library for data access you need to provide it name when running query:
的添加迁移-StartUpProjectName你DAL工程MyNewMigration 的
的更新 - 数据库-StartUpProjectName你DAL工程-Verbose 的
更多推荐
例外实体框架代码优先迁移
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