I defined and implemented IRepository
, IEntity
code as below.
//define Repository
public interface IRepository {}
public interface IRepository<TEntity, TPrimaryKey> where TEntity : class, IEntity<TPrimaryKey>
{
TEntity Insert(TEntity entity);
}
public interface IRepository<TEntity> : IRepository<TEntity, int> where TEntity : class, IEntity<int> { }
public class Repository<TEntity, TPrimaryKey> : IRepository<TEntity, TPrimaryKey> where TEntity : class, IEntity<TPrimaryKey>
{
public TEntity Insert(TEntity entity)
{
return entity;
}
}
public class Repository<TEntity> : Repository<TEntity, int> where TEntity : class, IEntity<int> { }
public interface IEntity<TPrimaryKey>
{
TPrimaryKey Id { get; set; }
}
//define entity
public interface IEntity : IEntity<int> { }
public abstract class Entity : Entity<int>, IEntity { }
public abstract class Entity<TPrimaryKey> : IEntity<TPrimaryKey>
{
public virtual TPrimaryKey Id { get; set; }
}
//customer
public class Customer : Entity
{
public string Name { get; set; }
}
when i try to create initialize a Repository<customer>()
IRepository<Customer> repository = new Repository<Customer>();
I got this error:
'Infrastructure.Repository.Repository' to 'Infrastructure.Repository.IRepository'. An explicit conversion exists (are you missing a cast?)
But when i use code above, it works.
IRepository<Customer,int> repository = new Repository<Customer>();
i thought IRepository<customer,int>
is equal to IRepository<customer>
What is the problem when initial a repository like this:
IRepository<Customer> repository = new Repository<Customer>();
As mentioned by @Reasurria in the comments, your Repository<TEntity>
class does not inherit from IRepository<TEntity>
so the compiler cannot perform an implicit conversion between them. You need to update your class definition to include the missing interface:
public class Repository<TEntity> : Repository<TEntity, int>, IRepository<TEntity> where TEntity : class, IEntity<int> { }
I dont know if this can solve your problem: When i test your code like this
IRepository<Customer> repository =(IRepository<Customer>) new Repository<Customer>();
Casting to IRepository, the error has gone. Maybe the compiler don t know what to do because you have 2 declarations of
Repository` class.
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