Entity Framework Generic Repository

Generic Repository

public interface IRepository
{
	IQueryable<T> Query<T>() where T : class;
	T Add<T>(T entity) where T : class;
	T Update<T>(T entity) where T : class;
	void Delete<T>(T entity) where T : class;
}

public class Repository : IRepository
{
	private readonly DbContext _context;

	public Repository(DbContext context)
	{
		_context = context;
	}

	public IQueryable<T> Query<T>() where T : class
	{
		return _context.Set<T>().AsQueryable().AsNoTracking();
	}

	public T Add<T>(T entity) where T : class
	{
		_context.Entry(entity).State = System.Data.EntityState.Added;
		Save();
		return entity;
	}

	public T Update<T>(T entity) where T : class
	{
		_context.Entry(entity).State = System.Data.EntityState.Modified;
		Save();
		return entity;
	}

	public void Delete<T>(T entity) where T : class
	{
		_context.Entry(entity).State = System.Data.EntityState.Deleted;
		Save();
	}

	private void Save()
	{
		_context.SaveChanges();
	}
}