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我正在開發基於nopCommerce的項目。爲了更新自定義實體，我想啓用EF遷移。於是我運行以下命令：在程序集中找不到上下文類型EF6
Enable-Migrations -StartUpProjectName nop.web -ContextProjectName Nop.Plugin.Payments.Deposit -verbose
並且得到錯誤：
Using StartUp project 'Nop.Web'.
System.Data.Entity.Migrations.Infrastructure.MigrationsException: No context type was found in the assembly 'Nop.Plugin.Payments.Deposit'.
at System.Data.Entity.Utilities.TypeFinder.FindType(Type baseType, String typeName, Func`2 filter, Func`2 noType, Func`3 multipleTypes, Func`3 noTypeWithName, Func`3 multipleTypesWithName)
at System.Data.Entity.Migrations.Design.ToolingFacade.GetContextTypeRunner.Run()
at System.AppDomain.DoCallBack(CrossAppDomainDelegate callBackDelegate)
at System.AppDomain.DoCallBack(CrossAppDomainDelegate callBackDelegate)
at System.Data.Entity.Migrations.Design.ToolingFacade.Run(BaseRunner runner)
at System.Data.Entity.Migrations.Design.ToolingFacade.GetContextType(String contextTypeName)
at System.Data.Entity.Migrations.EnableMigrationsCommand.FindContextToEnable(String contextTypeName)
at System.Data.Entity.Migrations.EnableMigrationsCommand.<>c__DisplayClass2.<.ctor>b__0()
at System.Data.Entity.Migrations.MigrationsDomainCommand.Execute(Action command)
No context type was found in the assembly 'Nop.Plugin.Payments.Deposit'.
上下文類定義如下：
public class DepositTransactionObjectContext : DbContext, IDbContext
{
public DepositTransactionObjectContext(string nameOrConnectionString) : base(nameOrConnectionString) { }
public DepositTransactionObjectContext() { }
public IList<TEntity> ExecuteStoredProcedureList<TEntity>(string commandText, params object[] parameters) where TEntity : BaseEntity, new()
{
throw new System.NotImplementedException();
}
public IEnumerable<TElement> SqlQuery<TElement>(string sql, params object[] parameters)
{
throw new System.NotImplementedException();
}
public int ExecuteSqlCommand(string sql, bool doNotEnsureTransaction = false, int? timeout = null, params object[] parameters)
{
throw new System.NotImplementedException();
}
public void Detach(object entity)
{
throw new System.NotImplementedException();
}
public bool ProxyCreationEnabled { get; set; }
public bool AutoDetectChangesEnabled { get; set; }
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Configurations.Add(new DepositTransactionMap());
base.OnModelCreating(modelBuilder);
}
public string CreateDatabaseInstallationScript()
{
return ((IObjectContextAdapter)this).ObjectContext.CreateDatabaseScript();
}
public void Install()
{
//It's required to set initializer to null (for SQL Server Compact).
//otherwise, you'll get something like "The model backing the 'your context name' context has changed since the database was created. Consider using Code First Migrations to update the database"
Database.SetInitializer<DepositTransactionObjectContext>(null);
Database.ExecuteSqlCommand(CreateDatabaseInstallationScript());
SaveChanges();
}
public void Uninstall()
{
this.DropPluginTable("DepositTransaction");
}
public new IDbSet<TEntity> Set<TEntity>() where TEntity : BaseEntity
{
return base.Set<TEntity>();
}
}
我已經創建了空項目，並啓用遷移有。然後，我已經複製並調整Configuration.cs所以它看起來是這樣的：
namespace Nop.Plugin.Payments.Deposit.Migrations
{
using Data;
using System.Data.Entity.Migrations;
internal sealed class Configuration : DbMigrationsConfiguration<DepositTransactionObjectContext>
{
public Configuration()
{
AutomaticMigrationsEnabled = true;
}
protected override void Seed(DepositTransactionObjectContext context)
{
}
}
}
然而，當我運行Add-遷移我獲得以下錯誤：
Using StartUp project 'Nop.Web'.
Using NuGet project 'Nop.Plugin.Payments.Deposit'.
System.Data.Entity.Migrations.Infrastructure.MigrationsException: No migrations configuration type was found in the assembly 'Nop.Plugin.Payments.Deposit'. (In Visual Studio you can use the Enable-Migrations command from Package Manager Console to add a migrations configuration).
at System.Data.Entity.Utilities.TypeFinder.FindType(Type baseType, String typeName, Func`2 filter, Func`2 noType, Func`3 multipleTypes, Func`3 noTypeWithName, Func`3 multipleTypesWithName)
at System.Data.Entity.Migrations.Utilities.MigrationsConfigurationFinder.FindMigrationsConfiguration(Type contextType, String configurationTypeName, Func`2 noType, Func`3 multipleTypes, Func`3 noTypeWithName, Func`3 multipleTypesWithName)
at System.Data.Entity.Migrations.Design.ToolingFacade.BaseRunner.FindConfiguration()
at System.Data.Entity.Migrations.Design.ToolingFacade.ScaffoldRunner.Run()
at System.AppDomain.DoCallBack(CrossAppDomainDelegate callBackDelegate)
at System.AppDomain.DoCallBack(CrossAppDomainDelegate callBackDelegate)
at System.Data.Entity.Migrations.Design.ToolingFacade.Run(BaseRunner runner)
at System.Data.Entity.Migrations.Design.ToolingFacade.Scaffold(String migrationName, String language, String rootNamespace, Boolean ignoreChanges)
at System.Data.Entity.Migrations.AddMigrationCommand.Execute(String name, Boolean force, Boolean ignoreChanges)
at System.Data.Entity.Migrations.AddMigrationCommand.<>c__DisplayClass2.<.ctor>b__0()
at System.Data.Entity.Migrations.MigrationsDomainCommand.Execute(Action command)
No migrations configuration type was found in the assembly 'Nop.Plugin.Payments.Deposit'. (In Visual Studio you can use the Enable-Migrations command from Package Manager Console to add a migrations configuration).
我讀了很多同樣的問題，無處不在的原因是在Enable-Migrations cmdlet中指定的錯誤項目（沒有定義上下文的項目）。但你可以看到，這不是我的情況。
還有什麼可能的原因？
我也試過。結果是一樣的。 – Ralfeus