Question

这是我想要做的原型，除了我意识到它不能像我写的那样工作：

using System.Collections.ObjectModel;

namespace Merlinia.CommonClasses
{
   public abstract class JustTesting<TItem> : KeyedCollection<string, TItem>
   {
      protected override string GetKeyForItem(TItem anItem)
      {
         return GetKeyForItem(anItem).ToUpperInvariant();
      }

      protected new abstract string GetKeyForItem(TItem anItem);
   }
}

现在我意识到通过在派生类中更改我需要的抽象方法的名称，它确实有效：

using System.Collections.ObjectModel;

namespace Merlinia.CommonClasses
{
   public abstract class JustTesting<TItem> : KeyedCollection<string, TItem>
   {
      protected override string GetKeyForItem(TItem anItem)
      {
         return NewGetKeyForItem(anItem).ToUpperInvariant();
      }

      protected abstract string NewGetKeyForItem(TItem anItem);
   }
}

我只是希望所有类中的方法名称相同，即GetKeyForItem。有没有办法让这项工作？

Answer 1

您可以在层次结构中插入额外的类和内部帮助函数来执行此操作。

using System.Collections.ObjectModel;

namespace Merlinia.CommonClasses
{
   public abstract class JustTestingBase<TItem> : KeyedCollection<string, TItem>
   {
      internal JustTestingBase()
      {
        // so that other assemblies cannot misuse this as their own base class
      }

      protected sealed override string GetKeyForItem(TItem anItem)
      {
         return GetKeyForItemHelper(anItem).ToUpperInvariant();
      }

      internal abstract string GetKeyForItemHelper(TItem anItem);
   }

   public abstract class JustTesting<TItem> : JustTestingBase<TItem>
   {
      protected new abstract string GetKeyForItem(TItem anItem);

      internal override string GetKeyForItemHelper(TItem anItem)
      {
        return GetKeyForItem(anItem);
      }
   }
}

是否有可能（部分）实现抽象方法并仍然需要派生类来实现它？

1 个答案: