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Update April 1st, 2026 The Beta site is being retired. Update February 27th, 2026 Another post discussing the changes with the Chief Product and Technology Officer is here. Update February 26th, ...
If the new() generic constraint is applied, as in this example, that allows the class or method (the AuthenticationBase
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 ...