Use和using的区别为：意思不同、用法不同、词性不同。 一、意思不同 1、use：用，使用。 2、using：利用，运用。 二、用法不同 1、use：use是及物动词，接名词、代词作宾语。也可接由as短. Using using helps prevent problems using exceptions. In c++11, the using keyword when used for type alias is identical to typedef.
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The using scope modifier is supported in the following contexts:
Using the using keyword can be useful.
Either way, when the using block is exited (either by successful completion or by error) it is closed. What are the uses of using? The problem with putting using namespace in the header files of your classes is that it forces anyone who wants to use your classes (by including your header files) to also be 'using' (i.e. From msdn, using statement (c# reference) the using statement ensures that dispose is called even if an exception occurs while you are calling methods on the object.
In particular, this is the difference between a using directive (which makes types available via different or shorter names) and a using statement (which calls dispose automatically). Using using can help you use disposable objects more usefully. Although i think it would be better to organize like this because it's a lot easier to see what is. User kokos answered the wonderful hidden features of c# question by mentioning the using keyword.
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