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The readonly keyword does a similar thing to fields. Like fields marked as const they cannot change once initialized. The difference is that one can choose to initialize them in a constructor, or to a value that is not known until run-time. [12] This only works on fields. readonly fields can either be members of an instance or static class members.
Unlike C++'s const, Java's final, and C#'s readonly, they are transitive and recursively apply to anything reachable through references of such a variable. The difference between const and immutable is what they apply to: const is a property of the variable: there might legally exist mutable references to referred value, i.e. the value can ...
In some programming languages, const is a type qualifier (a keyword applied to a data type) that indicates that the data is read-only. While this can be used to declare constants , const in the C family of languages differs from similar constructs in other languages in that it is part of the type , and thus has complicated behavior when ...
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.
C# is a language in which the null object pattern can be properly implemented. This example shows animal objects that display sounds and a NullAnimal instance used in place of the C# null keyword. The null object provides consistent behaviour and prevents a runtime null reference exception that would occur if the C# null keyword were used instead.
In C#, a class is a reference type while a struct (concept derived from the struct in C language) is a value type. [5] Hence an instance derived from a class definition is an object while an instance derived from a struct definition is said to be a value object (to be precise a struct can be made immutable to represent a value object declaring attributes as readonly [6]).
readonly. Specify that the subsequent array address operation performs no type check at runtime, and that it returns a controlled-mutability managed pointer. Prefix to instruction 0xFE 0x1D refanytype: Push the type token stored in a typed reference. Object model instruction 0xC2 refanyval <type> Push the address stored in a typed reference.
The equivalent keyword for variables is readonly [12] Note that a key difference between the C/C++ derived keyword const and the C# keyword readonly is that const is evaluated at compile time, while readonly is evaluated at runtime, and thus can have an expression that is only calculated and fixed later (at runtime).