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https://msdn.microsoft.com/en-us/library/51y09td4.aspx
In C#, the new keyword can be used as an operator, a modifier, or a constraint.
Used to create objects and invoke constructors.
Used to hide an inherited member from a base class member.
Used to restrict types that might be used as arguments for a type parameter in a generic declaration.
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原文地址：http://www.cnblogs.com/chucklu/p/5278094.html
