How to include a child object s child object in Entity Framework 5

Question

I am using Entity Framework 5 code first and ASP NET MVC 3   I am struggling to get a child object s child object to populate   Below are my classes    Application class   public class Application           Partial list of properties       public virtual ICollection lt Child gt  Children   get  set        Child class   public class Child           Partial list of properties       public int ChildRelationshipTypeId   get  set          public virtual ChildRelationshipType ChildRelationshipType   get  set        ChildRelationshipType class   public class ChildRelationshipType        public int Id   get  set          public string Name   get  set        Part of GetAll method in the repository to return all the applications   return DatabaseContext Applications       Include  Children      The Child class contains a reference to the ChildRelationshipType class   To work with an application s children I would have something like this   foreach  Child child in application Children         string childName   child ChildRelationshipType Name      I get an error here that the object context is already closed   How do I specify that each child object must include the ChildRelationshipType object like what I did above

User · Answer

With EF Core in  NET Core you can use the keyword ThenInclude    return DatabaseContext Applications   Include a   gt  a Children  ThenInclude c   gt  c ChildRelationshipType     Include childs from childrens collection    return DatabaseContext Applications   Include a   gt  a Childrens  ThenInclude cs   gt  cs ChildRelationshipType1    Include a   gt  a Childrens  ThenInclude cs   gt  cs ChildRelationshipType2

User · Answer

I ended up doing the following and it works   return DatabaseContext Applications       Include  Children ChildRelationshipType

User · Answer

If you include the library System Data Entity you can use an overload of the Include   method which takes a lambda expression instead of a string  You can then Select   over children with Linq expressions rather than string paths   return DatabaseContext Applications       Include a   gt  a Children Select c   gt  c ChildRelationshipType

User · Answer

A good example of using the Generic Repository pattern and implementing a generic solution for this might look something like this   public IList lt TEntity gt  Get lt TParamater gt  IList lt Expression lt Func lt TEntity  TParamater gt  gt  gt  includeProperties          foreach  var include in includeProperties                  query   query Include include                   return query ToList

[entity-framework] How to include a child object's child object in Entity Framework 5

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