22/06/27 20:38:42.94 Kbl5ft5+0.net
>>167
var mylist = new MyList();
var c0 = mylist.Count; // build error
// MyList は IList<int> : ICollection<int> をもつので
var c1 = ((ICollection<int>)mylist).Count;
// MListでint ICollection<int>.Count { get; } という memberをもつので
var c2 = ((ICollection<int>)mylist).Count;
c1は 万能