asp.net mvc - DbContext constructor with connString causes problems with EF Migrations and EF Powertools -

i pass connection string constructor of dbcontext. way has been answered here: pass connection string code-first dbcontext

(code if don't click)

public mycontext(string connstring)     : base(connstring) {  } 

however, when attempt enable migrations receive error: "the target context '...' not constructible. add default constructor or provide implementation of idbcontextfactory."

also, when attempt use ef powertools generate entity data model receive error: "a constructible type deriving dbcontext not found in selected file."

is common problem? have fix, feels hack. 1 else have deal before?

add empty constructor, e.g...

public mycontext() { } 

thing once define parametrized ctor default 1 gets hidden

e.g. see why default parameterless constructor go away when create 1 parameters

that's 1 way of 'hiding' default construction outside users.

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usually don't expose 'other' ctor outside - 'yours', hardcode inside need. or alternatively , better - use 'app.config' specify connection string. details (and problems it) see...

migration not alter table
migration not working wish... asp.net entityframework