在我的应用程序中，我的models int Id primary key为models。现在我已经到了我真正需要三个string Id来Id的地步。我将所有三个string更改为migration，但在创建update-database并运行public class Project
{
public int Id { get; set; }
[ForeignKey("VendorId")]
public Vendor Vendor { get; set; }
public string VendorId { get; set; }
[ForeignKey("ClientId")]
public Client Client { get; set; }
public string ClientId { get; set; }
[ForeignKey("AdministratorId")]
public Administrator Administrator { get; set; }
[Display(Name = "Administrator")]
public string AdministratorId { get; set; }
}
后，我收到错误消息。这就是我现在拥有的：
项目模型：
public class Client
{
[Key]
[DatabaseGenerated(DatabaseGeneratedOption.None)]
public string Id { get; set; }
}
客户端模型：
public class Vendor
{
[Key]
[DatabaseGenerated(DatabaseGeneratedOption.None)]
public string Id { get; set; }
}
供应商模型：
public class Administrator
{
[Key]
[DatabaseGenerated(DatabaseGeneratedOption.None)]
public string Id { get; set; }
}
管理员模型：
Vendor（提到我删除了不必要的代码）
当Client，Administrator和int Id模型具有update-database时，这非常有效，但现在，这是我在System.Data.SqlClient.SqlException (0x80131904): The constraint 'PK_dbo.Administrators' is being referenced by table 'Projects', foreign key constraint 'FK_dbo.Jobs_dbo.Administrators_AdministratorId'.
Could not drop constraint. See previous errors.
at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction)
at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose)
at System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady)
at System.Data.SqlClient.SqlCommand.RunExecuteNonQueryTds(String methodName, Boolean async, Int32 timeout, Boolean asyncWrite)
at System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(TaskCompletionSource`1 completion, String methodName, Boolean sendToPipe, Int32 timeout, Boolean asyncWrite)
at System.Data.SqlClient.SqlCommand.ExecuteNonQuery()
at System.Data.Entity.Infrastructure.Interception.DbCommandDispatcher.<NonQuery>b__0(DbCommand t, DbCommandInterceptionContext`1 c)
at System.Data.Entity.Infrastructure.Interception.InternalDispatcher`1.Dispatch[TTarget,TInterceptionContext,TResult](TTarget target, Func`3 operation, TInterceptionContext interceptionContext, Action`3 executing, Action`3 executed)
at System.Data.Entity.Infrastructure.Interception.DbCommandDispatcher.NonQuery(DbCommand command, DbCommandInterceptionContext interceptionContext)
at System.Data.Entity.Internal.InterceptableDbCommand.ExecuteNonQuery()
at System.Data.Entity.Migrations.DbMigrator.ExecuteSql(MigrationStatement migrationStatement, DbConnection connection, DbTransaction transaction, DbInterceptionContext interceptionContext)
at System.Data.Entity.Migrations.Infrastructure.MigratorLoggingDecorator.ExecuteSql(MigrationStatement migrationStatement, DbConnection connection, DbTransaction transaction, DbInterceptionContext interceptionContext)
at System.Data.Entity.Migrations.DbMigrator.ExecuteStatementsInternal(IEnumerable`1 migrationStatements, DbConnection connection, DbTransaction transaction, DbInterceptionContext interceptionContext)
at System.Data.Entity.Migrations.DbMigrator.ExecuteStatementsWithinTransaction(IEnumerable`1 migrationStatements, DbTransaction transaction, DbInterceptionContext interceptionContext)
at System.Data.Entity.Migrations.DbMigrator.ExecuteStatementsWithinNewTransaction(IEnumerable`1 migrationStatements, DbConnection connection, DbInterceptionContext interceptionContext)
at System.Data.Entity.Migrations.DbMigrator.ExecuteStatementsInternal(IEnumerable`1 migrationStatements, DbConnection connection, DbInterceptionContext interceptionContext)
at System.Data.Entity.Migrations.DbMigrator.ExecuteStatementsInternal(IEnumerable`1 migrationStatements, DbConnection connection)
at System.Data.Entity.Migrations.DbMigrator.<>c__DisplayClass30.<ExecuteStatements>b__2e()
at System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.<>c__DisplayClass1.<Execute>b__0()
at System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute[TResult](Func`1 operation)
at System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute(Action operation)
at System.Data.Entity.Migrations.DbMigrator.ExecuteStatements(IEnumerable`1 migrationStatements, DbTransaction existingTransaction)
at System.Data.Entity.Migrations.DbMigrator.ExecuteStatements(IEnumerable`1 migrationStatements)
at System.Data.Entity.Migrations.Infrastructure.MigratorBase.ExecuteStatements(IEnumerable`1 migrationStatements)
at System.Data.Entity.Migrations.DbMigrator.ExecuteOperations(String migrationId, VersionedModel targetModel, IEnumerable`1 operations, IEnumerable`1 systemOperations, Boolean downgrading, Boolean auto)
at System.Data.Entity.Migrations.DbMigrator.ApplyMigration(DbMigration migration, DbMigration lastMigration)
at System.Data.Entity.Migrations.Infrastructure.MigratorLoggingDecorator.ApplyMigration(DbMigration migration, DbMigration lastMigration)
at System.Data.Entity.Migrations.DbMigrator.Upgrade(IEnumerable`1 pendingMigrations, String targetMigrationId, String lastMigrationId)
at System.Data.Entity.Migrations.Infrastructure.MigratorLoggingDecorator.Upgrade(IEnumerable`1 pendingMigrations, String targetMigrationId, String lastMigrationId)
at System.Data.Entity.Migrations.DbMigrator.UpdateInternal(String targetMigration)
at System.Data.Entity.Migrations.DbMigrator.<>c__DisplayClassc.<Update>b__b()
at System.Data.Entity.Migrations.DbMigrator.EnsureDatabaseExists(Action mustSucceedToKeepDatabase)
at System.Data.Entity.Migrations.Infrastructure.MigratorBase.EnsureDatabaseExists(Action mustSucceedToKeepDatabase)
at System.Data.Entity.Migrations.DbMigrator.Update(String targetMigration)
at System.Data.Entity.Migrations.Infrastructure.MigratorBase.Update(String targetMigration)
at System.Data.Entity.Migrations.Design.ToolingFacade.UpdateRunner.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.Update(String targetMigration, Boolean force)
at System.Data.Entity.Migrations.UpdateDatabaseCommand.<>c__DisplayClass2.<.ctor>b__0()
at System.Data.Entity.Migrations.MigrationsDomainCommand.Execute(Action command)
ClientConnectionId:b67d4f49-f332-4897-a129-f10751ee40ed
Error Number:3725,State:0,Class:16
The constraint 'PK_dbo.Administrators' is being referenced by table 'Projects', foreign key constraint 'FK_dbo.Jobs_dbo.Administrators_AdministratorId'.
Could not drop constraint. See previous errors.
命令上得到的错误：
public override void Up()
{
DropForeignKey("dbo.Projects","ClientId","dbo.Clients");
DropForeignKey("dbo.InvoicePayables","AdministratorId","dbo.Administrators");
DropForeignKey("dbo.InvoicePayables","VendorId","dbo.Vendors");
DropForeignKey("dbo.InvoiceTakings","AdministratorId","dbo.Administrators");
DropForeignKey("dbo.InvoiceTakings","ClientId","dbo.Clients");
DropForeignKey("dbo.Projects","AdministratorId","dbo.Administrators");
DropForeignKey("dbo.ClientContactPersons","Client_Id","dbo.Clients");
DropForeignKey("dbo.Translations","Vendor_Id","dbo.Vendors");
DropForeignKey("dbo.Projects","VendorId","dbo.Vendors");
DropIndex("dbo.ClientContactPersons",new[]{"Client_Id"});
DropIndex("dbo.Projects",new[]{"VendorId"});
DropIndex("dbo.Projects",new[]{"ClientId"});
DropIndex("dbo.Projects",new[]{"AdministratorId"});
DropIndex("dbo.InvoicePayables",new[]{"VendorId"});
DropIndex("dbo.InvoicePayables",new[]{"AdministratorId"});
DropIndex("dbo.Translations",new[]{"Vendor_Id"});
DropIndex("dbo.InvoiceTakings",new[]{"ClientId"});
DropIndex("dbo.InvoiceTakings",new[]{"AdministratorId"});
DropPrimaryKey("dbo.Administrators");
DropPrimaryKey("dbo.Clients");
DropPrimaryKey("dbo.Vendors");
AddColumn("dbo.InvoiceTakings","Administrator_Id",c=>c.String(maxLength:128));
AddColumn("dbo.InvoiceTakings","Client_Id",c=>c.String(maxLength:128));
AlterColumn("dbo.Administrators","Id",c=>c.String(nullable:false,maxLength:128));
AlterColumn("dbo.ClientContactPersons","Client_Id",c=>c.String(maxLength:128));
AlterColumn("dbo.Clients","Id",c=>c.String(nullable:false,maxLength:128));
AlterColumn("dbo.Projects","VendorId",c=>c.String(maxLength:128));
AlterColumn("dbo.Projects","ClientId",c=>c.String(maxLength:128));
AlterColumn("dbo.Projects","AdministratorId",c=>c.String(maxLength:128));
AlterColumn("dbo.InvoicePayables","VendorId",c=>c.String(maxLength:128));
AlterColumn("dbo.InvoicePayables","AdministratorId",c=>c.String(maxLength:128));
AlterColumn("dbo.Vendors","Id",c=>c.String(nullable:false,maxLength:128));
AlterColumn("dbo.Translations","Vendor_Id",c=>c.String(maxLength:128));
AddPrimaryKey("dbo.Administrators","Id");
AddPrimaryKey("dbo.Clients","Id");
AddPrimaryKey("dbo.Vendors","Id");
CreateIndex("dbo.ClientContactPersons","Client_Id");
CreateIndex("dbo.Projects","VendorId");
CreateIndex("dbo.Projects","ClientId");
CreateIndex("dbo.Projects","AdministratorId");
CreateIndex("dbo.InvoicePayables","VendorId");
CreateIndex("dbo.InvoicePayables","AdministratorId");
CreateIndex("dbo.Translations","Vendor_Id");
CreateIndex("dbo.InvoiceTakings","Administrator_Id");
CreateIndex("dbo.InvoiceTakings","Client_Id");
AddForeignKey("dbo.Projects","ClientId","dbo.Clients","Id");
AddForeignKey("dbo.InvoicePayables","AdministratorId","dbo.Administrators","Id");
AddForeignKey("dbo.InvoicePayables","VendorId","dbo.Vendors","Id");
AddForeignKey("dbo.InvoiceTakings","Administrator_Id","dbo.Administrators","Id");
AddForeignKey("dbo.InvoiceTakings","Client_Id","dbo.Clients","Id");
AddForeignKey("dbo.Projects","AdministratorId","dbo.Administrators","Id");
AddForeignKey("dbo.ClientContactPersons","Client_Id","dbo.Clients","Id");
AddForeignKey("dbo.Translations","Vendor_Id","dbo.Vendors","Id");
AddForeignKey("dbo.Projects","VendorId","dbo.Vendors","Id");
}
public override void Down()
{
DropForeignKey("dbo.Projects","VendorId","dbo.Vendors");
DropForeignKey("dbo.Translations","Vendor_Id","dbo.Vendors");
DropForeignKey("dbo.ClientContactPersons","Client_Id","dbo.Clients");
DropForeignKey("dbo.Projects","AdministratorId","dbo.Administrators");
DropForeignKey("dbo.InvoiceTakings","Client_Id","dbo.Clients");
DropForeignKey("dbo.InvoiceTakings","Administrator_Id","dbo.Administrators");
DropForeignKey("dbo.InvoicePayables","VendorId","dbo.Vendors");
DropForeignKey("dbo.InvoicePayables","AdministratorId","dbo.Administrators");
DropForeignKey("dbo.Projects","ClientId","dbo.Clients");
DropIndex("dbo.InvoiceTakings",new[]{"Client_Id"});
DropIndex("dbo.InvoiceTakings",new[]{"Administrator_Id"});
DropIndex("dbo.Translations",new[]{"Vendor_Id"});
DropIndex("dbo.InvoicePayables",new[]{"AdministratorId"});
DropIndex("dbo.InvoicePayables",new[]{"VendorId"});
DropIndex("dbo.Projects",new[]{"AdministratorId"});
DropIndex("dbo.Projects",new[]{"ClientId"});
DropIndex("dbo.Projects",new[]{"VendorId"});
DropIndex("dbo.ClientContactPersons",new[]{"Client_Id"});
DropPrimaryKey("dbo.Vendors");
DropPrimaryKey("dbo.Clients");
DropPrimaryKey("dbo.Administrators");
AlterColumn("dbo.Translations","Vendor_Id",c=>c.Int());
AlterColumn("dbo.Vendors","Id",c=>c.Int(nullable:false,identity:true));
AlterColumn("dbo.InvoicePayables","AdministratorId",c=>c.Int(nullable:false));
AlterColumn("dbo.InvoicePayables","VendorId",c=>c.Int(nullable:false));
AlterColumn("dbo.Projects","AdministratorId",c=>c.Int());
AlterColumn("dbo.Projects","ClientId",c=>c.Int(nullable:false));
AlterColumn("dbo.Projects","VendorId",c=>c.Int());
AlterColumn("dbo.Clients","Id",c=>c.Int(nullable:false,identity:true));
AlterColumn("dbo.ClientContactPersons","Client_Id",c=>c.Int());
AlterColumn("dbo.Administrators","Id",c=>c.Int(nullable:false,identity:true));
DropColumn("dbo.InvoiceTakings","Client_Id");
DropColumn("dbo.InvoiceTakings","Administrator_Id");
AddPrimaryKey("dbo.Vendors","Id");
AddPrimaryKey("dbo.Clients","Id");
AddPrimaryKey("dbo.Administrators","Id");
CreateIndex("dbo.InvoiceTakings","AdministratorId");
CreateIndex("dbo.InvoiceTakings","ClientId");
CreateIndex("dbo.Translations","Vendor_Id");
CreateIndex("dbo.InvoicePayables","AdministratorId");
CreateIndex("dbo.InvoicePayables","VendorId");
CreateIndex("dbo.Projects","AdministratorId");
CreateIndex("dbo.Projects","ClientId");
CreateIndex("dbo.Projects","VendorId");
CreateIndex("dbo.ClientContactPersons","Client_Id");
AddForeignKey("dbo.Projects","VendorId","dbo.Vendors","Id");
AddForeignKey("dbo.Translations","Vendor_Id","dbo.Vendors","Id");
AddForeignKey("dbo.ClientContactPersons","Client_Id","dbo.Clients","Id");
AddForeignKey("dbo.Projects","AdministratorId","dbo.Administrators","Id");
AddForeignKey("dbo.InvoiceTakings","ClientId","dbo.Clients","Id",cascadeDelete:true);
AddForeignKey("dbo.InvoiceTakings","AdministratorId","dbo.Administrators","Id",cascadeDelete:true);
AddForeignKey("dbo.InvoicePayables","VendorId","dbo.Vendors","Id",cascadeDelete:true);
AddForeignKey("dbo.InvoicePayables","AdministratorId","dbo.Administrators","Id",cascadeDelete:true);
AddForeignKey("dbo.Projects","ClientId","dbo.Clients","Id",cascadeDelete:true);
}
更新迁移代码：
{{1}}
（很抱歉，迁移的长代码...包括所有其他属性） 我错过了什么？