Summary of enum usages in C #

Enums enumerations are value types, and data is stored directly in the stack, rather than in isolation using references and real data.

(1) By default, the first variable in the enumeration is assigned a value of 0, the values of the other variables are incremented by the defined order (0,12,3 ...), so the following two code definitions are equivalent:

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1. Enum TrafficLight
2. {
3. Green,
4. Yellow,
5. Red
6. }

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1. Enum TrafficLight
2. {
3. Green = 0,
4. Yellow = 1,
5. Red = 2
6. }

(2) The names of variables of enum enum types cannot be the same, but the values can be the same, for example:

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1. Enum TrafficLight
2. {
3. Green = 0,
4. Yellow = 1, //Duplicate value, OK
5. Red = 1 //Duplicate value, OK
6. }

(3) If some of the members in the enum explicitly define the value and the part does not, the member that does not define the value is incremented by the value of the previous member, for example:

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2. Enum Looptype
4. {
6. None, //value is 0
8. Daily, //value is 1
10. Weekly = 7,
12. Monthly, //value is 8
14. Yeayly, //value is 9
16. Daygap = 15,
18. Weekgap, //value is
20. Monthgap, //value is
22. Yeargap //value is
24. }

(4) Enum enumeration members can be used as bit flags while supporting bitwise operations (BITS and bits or so), for example:

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1. Enum carddecksettings: uint
2. {
3. Singledeck = 0x01, //Bit 0
4. Largepictures = 0x02, //Bit 1
5. Fancynumbers = 0x04, //Bit 2
6. Animation = 0x08 //Bit 3
7. }

Summary of enum usages in C #