Why does List<T> need to inherit IList<T> and IList interfaces at th
时间：2010-09-12 来源：杨济瑞
To support backward compatibility 向后兼容
For example, if the List<T> class implemented only the IList<T> interface, no code could consider a List<DateTime> object an IList.
And interface IList is explict implemented in it. So you can only invoke the methods by its interface not class type.
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