Create BaseClass and Base Entity Type

i have base class derive several other classes from.

public interface someclass : baseclass

and have repo class has generic methods save, getbyid(int), getall()

the return type of getallmethod() of baseclass i.e

public list<baseclass> getall()

i getting error saying should this

public list<someclass> getall

but thought someclass , baseclass same thing? long someclass derived baseclass use base object derived baseclass work methods??

what missing????

    public interface ibaserepository     {         void save();         list<ibaseentity> getall();         ibaseentity getbyid(int id);      }       public interface ibaseentity     {      }       public class planrepository : iplanrespository     {         public void save()         {             throw new notimplementedexception();         }          public list<plan> getall()         {             throw new notimplementedexception();         }          public plan getbyid(int id)         {             throw new notimplementedexception();         }     }
    public interface iplan : ibaseentity     {         int       planid                { get; set; }      }
   

i errors these errors?

error 1  does not implement interface member .core.interfaces.ibaserepository.getbyid(int)'. core.repositories.planrepository.getbyid(int)' cannot implement core.interfaces.ibaserepository.getbyid(int)' because not have matching return 

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developer

i think case using generics.  the example below compiles , avoids issues.

public interface ibaserepository<t>     {         void save();         list<t> getall();         t getbyid(int id);      }      public interface ibaseentity { }      public interface iplanrespository<t> : ibaserepository<t> { }      public class plan : ibaseentity { }      public class planrepository : iplanrespository<plan>     {         public void save()         {             throw new notimplementedexception();         }          public list<plan> getall()         {             throw new notimplementedexception();         }          public plan getbyid(int id)         {             throw new notimplementedexception();         }     }      public interface iplan : ibaseentity     {         int planid { get; set; }     }

you use interfaces generics including type implementation uses, such as:

    public static class interfacestest     {         public static void dotest()         {             ibaserepository<plan> instance = new planrepository();              plan plan = instance.getbyid(12);         }     }

matt

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