反射 是一种“程序即数据”范例，允许程序的一部分根据程序集、类型和成员动态查询和调用另一部分。 这对于后期绑定编程模型和工具非常有用。

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协变和逆变，是为解决问题而生的。而要理清解决什么样的问题，需要首先从理清几个简单的概念开始。首先我们进行一点操作：

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注意这段代码创建了三个文件流：fin，表示明文形式的原始文件；fout，加密结果文件；crStream，加密流，用来把DES加密的结果转入输出文件fout。增加一个crStream流的好处是不必把结果保存到临时文件或缓冲区。

To maneuver The placement of the file or folder, decide on it and afterwards decide on Minimize  within the ribbon. Navigate to the new location, then select Paste .

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其中，out表示仅能作为返回值的类型参数，而in表示仅能作为参数的类型参数，不过一个接口可以既有out又有in，因此既可以支持协变、支持逆变，也可以同时支持，例如：

two Navigate to and both pick or open the travel or folder locale you should research in. (see screenshot beneath)