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Nullable types are a feature of some programming languages which allow a value to be set to the special value NULL instead of the usual possible values of the data type.In statically typed languages, a nullable type is an option type, [citation needed] while in dynamically typed languages (where values have types, but variables do not), equivalent behavior is provided by having a single null ...
This is a feature of C# 2.0. Nullable types were introduced in C# 2.0 firstly to enable value types to be null (useful when working with a database).
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.
C# has a static class syntax (not to be confused with static inner classes in Java), which restricts a class to only contain static methods. C# 3.0 introduces extension methods to allow users to statically add a method to a type (e.g., allowing foo.bar() where bar() can be an imported extension method working on the type of foo).
Identifier Description Time manipulation difftime: computes the difference in seconds between two time_t values : time: returns the current time of the system as a time_t value, number of seconds, (which is usually time since an epoch, typically the Unix epoch).
Accept-Datetime: Acceptable version in time. Accept-Datetime: Thu, 31 May 2007 20:35:00 GMT: Provisional RFC 7089: Accept-Encoding: List of acceptable encodings. See HTTP compression. Accept-Encoding: gzip, deflate: Permanent RFC 9110: Accept-Language: List of acceptable human languages for response. See Content negotiation. Accept-Language: en ...
null a: true a: false a: 685230 a: 6.8523015e+5 a "A to Z" 'A to Z' NoSpaces: true null -42.1e7 "A to Z" (true, null, -42.1e7, "A to Z") 42 true "A to Z" 1 2 3 42 true "A to Z", (1, 2, 3) Format Null Boolean true Boolean false Integer Floating-point String Array Associative array/Object; OpenDDL: ref {null} bool {true} bool {false} int32 ...