In the specific case of throw, throw new() is a shorthand for throw new Exception(). The feature was introduced in c# 9 and you can find the documentation as Target-typed new expressions. As you can see, there are quite a few places where it can be used (whenever the type to be created can be inferred) to make code shorter. The place where I like it the most is for fields/properties:
It is NOT 'bad' to use the new keyword. But if you forget it, you will be calling the object constructor as a regular function. If your constructor doesn't check its execution context then it won't notice that 'this' points to different object (ordinarily the global object) instead of the new instance. Therefore your constructor will be adding properties and methods to the global object ...
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In general, gallery apps do not save the media file. They scan the internal storage for existing media files and show them in the app. Anything happened to the media files in the internal storage will directly affect the media in the gallery app. Yes, WhatsApp will create a copy of the media in the Sent folders when the user sends a media file to someone. Deleting the media files in the Sent ...