GenericRepository.cs

// type restricted to operate only on IDomainObject reference types
public class GenericRepository : IRepository where T : class, IDomainObject
{
	private DbContext context;

	public GenericSqlRepository(DbContext context)
	{
		this.context = context;
	}

	public async Task AddAsync(T domainObject)
	{
		this.context.Set<T>().Add(domainObject);
		await this.context.SaveChangesAsync();
	}

	public async Task<IEnumerable<T>> GetListAsync(
		Expression<Func<T, bool>> predicate)
	{
		IQueryable query = this.GetPredicatedIQueryable(predicate);
		return await query.ToListAsync();
	}

	public async Task GetOneAsync(Guid id)
	{
		var entities = await this.GetListAsync(x => x.Id == id);
		return entities.FirstOrDefault();
	}

	public async Task UpdateAsync(T updatedEntity)
	{
		this.context.Update(updatedEntity);
		await this.context.SaveChangesAsync();
	}

	private IQueryable GetPredicatedIQueryable(
		Expression<Func<T, bool>> predicate)
	{
		return this.context.Set().Where(predicate);
	}
}