public List <Book> GetAll(Expression <Func <Book, bool> > filter = null)
{
using (BookDatabasesContext context = new BookDatabasesContext())
{
return(filter == null?context.Set <Book>().ToList() : context.Set <Book>().Where(filter).ToList());
}
}
public Book Get(Expression <Func <Book, bool> > filter)
{
using (BookDatabasesContext context = new BookDatabasesContext())
{
return(context.Set <Book>().SingleOrDefault(filter));
}
}
public PublishingHouse Get(Expression <Func <PublishingHouse, bool> > filter)
{
using (BookDatabasesContext context = new BookDatabasesContext())
{
return(context.Set <PublishingHouse>().SingleOrDefault(filter));
}
}
public void Update(Book entity)
{
using (BookDatabasesContext context = new BookDatabasesContext())
{
var updatedEntity = context.Entry(entity);
updatedEntity.State = EntityState.Modified;
context.SaveChanges();
}
}
public void Delete(Book entity)
{
using (BookDatabasesContext context = new BookDatabasesContext())
{
var deletedEntity = context.Entry(entity);
deletedEntity.State = EntityState.Deleted;
context.SaveChanges();
}
}
public void Add(Book entity)
{
using (BookDatabasesContext context = new BookDatabasesContext())
{
var addedEntity = context.Entry(entity);
addedEntity.State = EntityState.Added;
context.SaveChanges();
}
}