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namespace Shared;
public interface IGenericDataManager<T>
{
Task<int> GetNbItems();
Task<IEnumerable<T>> GetItems(int index, int count, string? orderingPropertyName = null, bool descending = false);
Task<int> GetNbItemsByName(string substring);
Task<IEnumerable<T>> GetItemsByName(string substring, int index, int count, string? orderingPropertyName = null, bool descending = false);
Task<T> UpdateItem(T oldItem, T newItem);
Task<T> AddItem(T item);
Task<bool> DeleteItem(T item);
}