2月7日，河北省邢台市宁晋县侯口三村一对六旬老夫妇被多只大狗袭击。知情人士告诉东方网纵相新闻记者，女性当场死亡，男性被咬成重伤，仍在医院治疗。
When we define our interfaces in C# 4.0, we are allowed to mark each of the generic parameters as in or out. If we try to set a generic parameter as out and that\'d lead to a problem, the compiler rai
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