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This is a feature of C# 3.0. C# 3.0 introduced type inference, allowing the type specifier of a variable declaration to be replaced by the keyword var, if its actual type can be statically determined from the initializer. This reduces repetition, especially for types with multiple generic type-parameters, and adheres more closely to the DRY ...
Call method indicated on the stack with arguments described by callsitedescr. Base instruction 0x6F callvirt <method> Call a method associated with an object. Object model instruction 0x74 castclass <class> Cast obj to class. Object model instruction 0xFE 0x01 ceq: Push 1 (of type int32) if value1 equals value2, else push 0. Base instruction ...
An extension method must be defined in a static class. An extension method must be defined as a static method. An extension method's first parameter must take the following form, where type is the name of the type to be extended: this type parameterName; An extension method may optionally define other parameters to follow the this parameter.
C# (/ ˌ s iː ˈ ʃ ɑːr p / see SHARP) [b] is a general-purpose high-level programming language supporting multiple paradigms.C# encompasses static typing, [16]: 4 strong typing, lexically scoped, imperative, declarative, functional, generic, [16]: 22 object-oriented (class-based), and component-oriented programming disciplines.
It provides a means to associate metadata with a class where the language does not have explicit support for such metadata. To use this pattern, a class implements a marker interface [ 1 ] (also called tagging interface ) which is an empty interface, [ 2 ] and methods that interact with instances of that class test for the existence of the ...
C# and VB.NET like Java have "sealed" and "Not Inheritable" class declaration keywords to prohibit inheritance, and require a subclass to use keyword "override" on overriding methods, [3] the same solution later adopted by Scala. Scala require a subclass to use keyword "override" explicitly in order to override a parent class method. In the ...
In C# 3.0, both an instance method and an extension method with the same signature can exist for a class. In such a scenario, the instance method is preferred over the extension method. Neither the compiler nor the Microsoft Visual Studio IDE warns about the naming conflict.
Impredicative polymorphism (also called first-class polymorphism) is the most powerful form of parametric polymorphism. [ 1 ] : 340 In formal logic , a definition is said to be impredicative if it is self-referential; in type theory, it refers to the ability for a type to be in the domain of a quantifier it contains.