大家好，小新来为大家解答以上的问题。嘉畅园，关于嘉畅园的介绍很多人还不知道，现在让我们一起来看看吧！
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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