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include directive vs include action

 
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include directive add the content of included resource at compile time where as include action add the content of included resource at request time.
But when we should use include directive and in which condition include action.
 
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The directive is good for boilerplate code such as copyright notices, etc.
By using the action you can set a page scope attribute in one page and then use it in the included page. It's a speed vs flexibility thing mainly.
 
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the directive should really only be used for code that will not change, such a library / 3rd party code, whereas the action can be used for code that may be added to or changed at any time.
generally however i don't think includes are a good idea, it's better to encapsulate into classes if possible.
 
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