c# - 在其成员函数之一中进一步约束泛型类c#

Question

这里对泛型缺乏经验。如果方法的类型位于其类型层次结构的更下方，我是否能够对方法的类型进行比其类约束更多的约束？

这是我尝试过的(BotAccountDetailsBase 派生自 AccountDetailsBase):

  public class SafeOffer<TAcc> where TAcc : AccountDetailsBase
  {
    public readonly TAcc account_;
    public readonly List<ItemData> items_;

    private SafeOffer(TAcc account, List<ItemData> items)
    {
      account_ = account;
      items_ = items;
    }

    public static List<SafeOffer<TAcc>> DivideOffer<TBot>(IEnumerable<BotAccountDetailsBase> accounts, List<ItemData> items) where TBot : BotAccountDetailsBase
    {
      var accounts_to_trade = new List<SafeOffer<TBot>>();

      // get the bots of the right type, order by slots
      var typed_account = accounts.OfType<TBot>().OrderByDescending(x => x.slotsleft_);

      foreach (var acc in typed_account)
      {
        if (items.Count > 0)
        {
          var bundle = items.Take(acc.slotsleft_);
          items.RemoveAll(x => bundle.Contains(x));
          var offer = new SafeOffer<TBot>(acc, bundle.ToList());
          accounts_to_trade.Add(offer);
        }
      }
      return accounts_to_trade;
    }
  }

由于 TAcc 和 TBot 不同，因此无法编译。有什么我可以使用的魔法吗？

Answer 1

只需将返回类型更改为 List<SafeOffer<TBot>> :

public static List<SafeOffer<TBot>> 
    DivideOffer<TBot>(IEnumerable<BotAccountDetailsBase> accounts, List<ItemData> items) 
        where TBot : BotAccountDetailsBase