c# - add migration failed when DbContext in sperate project -

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i have project different layers: web, services, model, data each 1 has different project in same solution. application, compiles , runs ok. when tried implement migration got following error

dnx . ef migration add migrationfile

system.invalidoperationexception: no dbcontext found. ensure you're using correct assembly , type neither abstract nor generic.    @ microsoft.data.entity.commands.contexttool.selecttype(ienumerable`1 types, string name)    @ microsoft.data.entity.commands.migrationtool.getcontexttype(string name)    @ microsoft.data.entity.commands.migrationtool.addmigration(string migrationname, string contexttypename, string startupassemblyname, string rootnamespace,string projectdir)    @ microsoft.data.entity.commands.program.<>c__displayclass12_0.<addmigration>b__0()    @ microsoft.data.entity.commands.program.execute(string startupproject, func`1 invoke)    @ microsoft.framework.runtime.common.commandline.commandlineapplication.execute(string[] args) --- end of stack trace previous location exception thrown ---     @ system.runtime.exceptionservices.exceptiondispatchinfo.throw()    @ microsoft.framework.runtime.common.entrypointexecutor.execute(assembly assembly, string[] args, iserviceprovider serviceprovider)    @ microsoft.framework.applicationhost.program.executemain(defaulthost host,string applicationname, string[] args)    @ microsoft.framework.applicationhost.program.main(string[] args) --- end of stack trace previous location exception thrown ---     @ system.runtime.exceptionservices.exceptiondispatchinfo.throw()    @ microsoft.framework.runtime.common.entrypointexecutor.execute(assembly assembly, string[] args, iserviceprovider serviceprovider)    @ dnx.host.bootstrapper.runasync(list`1 args, iruntimeenvironment env, frameworkname targetframework)    @ dnx.host.runtimebootstrapper.executeasync(string[] args, frameworkname targetframework)    @ dnx.host.runtimebootstrapper.execute(string[] args, frameworkname targetframework)

i'm using answer reference.

maybe project has more 1 dbcontext or have not turned on migrations.

if have more 1 context, want enable , add migrations each context separately:

add-migration -configurationtypename myproject.migrationsfolder.configuration "migrationname"

this code add new migration based on context , using configuration class associated it. following code update database associated configuration class.

update-database -configurationtypename myproject.migrationsfolder.configuration

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