/// <summary>
/// Initializes a new instance of DbRepository class.
/// </summary>
/// <param name="unitOfWork">Owner unit of work that provides context for repository entities.</param>
/// <param name="dbSetAccessor">Function that returns DbSet entities from Entity Framework DbContext.</param>
/// <param name="getPrimaryKeyExpression">Lambda-expression that returns entity primary key.</param>
/// <param name="setPrimaryKeyAction">
/// Action that provides a way to set entity primary key in case primary key is a
/// nullable type, otherwise this parameter can be ommited.
/// </param>
public DbRepository(DbUnitOfWork <TDbContext> unitOfWork, Func <TDbContext, DbSet <TEntity> > dbSetAccessor,
Expression <Func <TEntity, TPrimaryKey> > getPrimaryKeyExpression,
Action <TEntity, TPrimaryKey> setPrimaryKeyAction = null)
: base(unitOfWork, dbSetAccessor)
{
this.getPrimaryKeyExpression = getPrimaryKeyExpression;
entityTraits = ExpressionHelper.GetEntityTraits(this, getPrimaryKeyExpression, setPrimaryKeyAction);
}