网上演练
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#if NET20 || NET30 || !NET_4_6
using System.Collections.Generic;
namespace System.Linq.Reimplement
{
#if NETCF
public interface IGrouping<TKey, TElement> : IEnumerable<TElement>
#else
public interface IGrouping<out TKey, TElement> : IEnumerable<TElement>
#endif
{
TKey Key { get; }
}
}
#endif