c# - Why can't static classes have non-static methods and variables? -

-

why can't static classes have non-static methods , variables when non-static classes can have static methods , variables?

what advantage of having static methods , variables in non static class? though having static constructor in non-static class understandable.

static classes can't instantiated in first place, if declare non-static (instance) members, can never accessed. since there isn't point allowing reason, language prohibits it.

bear in mind static classes just classes, while there 2 things directly related non-static classes: the classes themselves, , the instances/objects of classes.

a non-static class can have both static , non-static members static members apply class, whereas non-static members apply instances of class.


Comments

Post a Comment

Popular posts from this blog

How can I edit my VIM config so that Vim treats ".ejs" files the same as it currently treats my html files? -

-
what put in vim config? how change it? i want .html extension...because html... i think need au bufread,bufnewfile *.ejs setfiletype html au short autocmd docs it's idea put inside test if has("autocmd") au bufread,bufnewfile *.ejs setfiletype html endif to avoid error messages if ever use cut-down version of vim doesn't support feature. finally, if have default filetype rule like: au bufread,bufnewfile * setfiletype text then *.ejs rule must above it.
Read more

Python __call__ special method practical example -

-
i know __call__ method in class triggered when instance of class called. however, have no idea when can use special method, because 1 can create new method , perform same operation done in __call__ method , instead of calling instance, can call method. i appreciate if gives me practical usage of special method. django forms module uses __call__ method nicely implement consistent api form validation. can write own validator form in django function. def custom_validator(value): #your validation logic django has default built-in validators such email validators, url validators etc., broadly fall under umbrella of regex validators. implement these cleanly, django resorts callable classes (instead of functions). implements default regex validation logic in regexvalidator , extends these classes other validations. class regexvalidator(object): def __call__(self, value): # validation logic class urlvalidator(regexvalidator): def __call__(self, valu...
Read more