What is an enum flag?
Enum Flags Attribute The idea of Enum Flags is to take an enumeration variable and allow it to hold multiple values. It should be used whenever the enum represents a collection of flags, rather than representing a single value. These enumeration collections are generally manipulated using bitwise operators.
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What is a C# flag?
Flags allow an enum value to contain many values. An enumeration type with the attribute [Flags] can have multiple constant values assigned to it. With Flags, it is still possible to test enums in switches and if statements. Flags can be removed or added.
Why is enum used in C#?
In C#, an enumeration (or enumeration type) is used to assign constant names to a group of numeric integer values. Makes constant values more readable, for example WeekDays. Monday is more readable than the number 0 when referring to the day of the week.
How to check the flags of an enum in C#?
As of C# 7.0, binary literals can also be used. To check if the value of the enum variable has a certain flag set, the HasFlag method can be used. Let’s say we have [Flags] enum MyEnum { One = 1, Two = 2, Three = 4 } and a value. var value = MyEnum.One | MyEnum.Two; With HasFlag we can check if any of the flags is activated
How to create a checked enum in C#?
To create a checked enum, you need to specify the attribute “[Banderas]” on the enum. Here are some guidelines for declaring an Enum as markup. Apply System.FlagsAttribute to flag enums. Do not apply this attribute to simple enums.
How many enum values can I use in flagsattribute?
Because the FlagsAttribute relies on enum constants being powers of two (or their combinations) and enum values ultimately being numeric values, it is limited by the size of the underlying numeric type. The largest available numeric type that you can use is UInt64, which allows you to specify 64 different (not combined) flag enum constants.
When do you use an enum type as a bit flag?
Uses an enumeration type to represent a choice from a set of mutually exclusive values or a combination of options. To represent a combination of options, define an enumeration type as bit flags.