entity framework 6 - EF6 Modified state throws exception -


i've read through of comments , feedback on same question on stackoverflow , elsewhere , none of solutions worked me.

my scenario.

i have edit screen populates data viewmodal.

once user clicks on update button, use automapper map viewmodel entity, can update data.

[httppost] public jsonresult edit(core.viewmodels.buildingviewmodel model) {     viewbag.title = "building | edit";      try     {         var entity = model.toentity<buildingviewmodel, core.entities.building>();         transactions.broker.askfor.building.update(entity);          return json(new { issuccess = true, message = "building updated", identity = entity.id });     }     catch (system.exception ex)     {         throw ex;     } }

what bugs me fact that, @ point, have no entity framework entity reference, simple poco gets mapped viewmodel.

why ef tell me cannot attach / add or modify entity because of existing primary key? not update is, taking entity exist, , saving changes down?

in uow, edit looks (commented out have tried already):

public virtual spaceresult<t> edit(t entity) {     spaceresult<t> result = new spaceresult<t>();      try     {         this._context.entry<t>(entity).state = system.data.entity.entitystate.modified;     }     catch (system.exception ex)     {         result.iserror = true;         result.message = ex.message;         result.innerexception = (ex.innerexception != null) ? ex.innerexception.message : string.empty;     }      return result; }

i don't see purpose of turning off tracking context, seems fix problem.

am missing within ef, or trying not support?


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