For example, you can not rely on the ToString() override of the Item class to inform entity framework to only select from the Name column, and any data type changes, such as Double to Decimal must be explicitly handled as well. Note that for this feature to work, all type conversions must be explicitly handled in your Mapping. ProjectTo() will tell AutoMapper’s mapping engine to emit a select clause to the IQueryable that will inform entity framework that it only needs to query the Name column of the Item table, same as if you manually projected your IQueryable to an OrderLineDTO with a Select clause. Name ))) public List GetLinesForOrder ( int orderId ) Id like to use the EF entities already created, in this case Team has a navigation.
#Ef select to new dto with icollections how to
In this article I am showing how to configure it to handle entity's child collections that those properly gets added and removed from collection. Map(odto, o) to map between the dto and entity, but what I find are new. Var configuration = new MapperConfiguration ( cfg => cfg. It seems that do this I need to create a new DTO class and use a select. Configuring Entity Framework through fluent API sometimes is quite hard. MapFrom Eager loading is the process whereby a query for one type of entity. The Presentation Layer calls an Application Service method with a Data Transfer Object (DTO).The application service then uses these domain objects to perform some specific business logic, and then finally returns a DTO back to the presentation layer.
Expression Translation (UseAsDataSource) Data Transfer Objects are used to transfer data between the Application Layer and the Presentation Layer.Otherwise EF will lazy load all passengers for each bus when the passengers are accessed during the conversion to DTOs. This only works when lazy loading is disabled. Preventing lazy loading/SELECT N+1 problems When you get the collection of buses by ToList you have the buses with the passengers you want and you can map them with AutoMapper.
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