Is there any way to give c# enums a “range” of allowed values?
2
Say I have an enum like the following, where I want the numbering to start at 1000.
public enum Fruits : uint
{
Apple = 1000,
Orange = 1001,
Strawberry = 1002,
Banana = 1003,
Blueberry = 1004,
}
Assigning each Fruit a number is tedious and hard to read, not to mention awkward if I have 20+ Fruits and might want to reorder them or add/remove a Fruit. Is there any kind of syntax like the following?
public enum Fruits : uint where value >= 1000
{
Apple,
Orange,
Strawberry,
Banana,
Blueberry,
}
c# enums
asked Nov 23 '18 at 1:25
Iamsodarncool
945
|
show 1 more comment
2
Say I have an enum like the following, where I want the numbering to start at 1000.
public enum Fruits : uint
{
Apple = 1000,
Orange = 1001,
Strawberry = 1002,
Banana = 1003,
Blueberry = 1004,
}
Assigning each Fruit a number is tedious and hard to read, not to mention awkward if I have 20+ Fruits and might want to reorder them or add/remove a Fruit. Is there any kind of syntax like the following?
public enum Fruits : uint where value >= 1000
{
Apple,
Orange,
Strawberry,
Banana,
Blueberry,
}
c# enums
asked Nov 23 '18 at 1:25
Iamsodarncool
945
7
Set1000only to first fruit, others fruits will have value incremented by 1
– Fabio
Nov 23 '18 at 1:28
2
Just define the value for your first element (Apple), and you are set. All further elements get values that will be incremented by one. The documentation forenumwill tell you this, too: docs.microsoft.com/en-us/dotnet/csharp/language-reference/…. Or here: docs.microsoft.com/en-us/dotnet/csharp/programming-guide/… Documentation is an amazing thing... ;-)
– elgonzo
Nov 23 '18 at 1:28
1
Note that even if you assign values, technically you can pass any integer as anenum; it just won't correspond to your defined values. That's becasue internally the enum is just compiled to a native type (usuallyint). Meaning if you have a function that accepts aFruitparameter, you could pass any value to it; it doesn't have to be one of your defined values.
– D Stanley
Nov 23 '18 at 1:42
as soon as you start to store values from that enum somewhere (files, a database, ...) and need to maintain a certain degree of version compatibility, you will find that explicitely numbering them and never change a number once assigned is what you want.
– dlatikay
Nov 23 '18 at 2:23
Standard trick to get a range that's useful for validation is to add an extra member, Last = Blueberry. And perhaps you want First = Apple in this case.
– Hans Passant
Nov 23 '18 at 2:31
|
show 1 more comment
2
2
2
Say I have an enum like the following, where I want the numbering to start at 1000.
public enum Fruits : uint
{
Apple = 1000,
Orange = 1001,
Strawberry = 1002,
Banana = 1003,
Blueberry = 1004,
}
Assigning each Fruit a number is tedious and hard to read, not to mention awkward if I have 20+ Fruits and might want to reorder them or add/remove a Fruit. Is there any kind of syntax like the following?
public enum Fruits : uint where value >= 1000
{
Apple,
Orange,
Strawberry,
Banana,
Blueberry,
}
c# enums
asked Nov 23 '18 at 1:25
Iamsodarncool
945
Say I have an enum like the following, where I want the numbering to start at 1000.
public enum Fruits : uint
{
Apple = 1000,
Orange = 1001,
Strawberry = 1002,
Banana = 1003,
Blueberry = 1004,
}
Assigning each Fruit a number is tedious and hard to read, not to mention awkward if I have 20+ Fruits and might want to reorder them or add/remove a Fruit. Is there any kind of syntax like the following?
public enum Fruits : uint where value >= 1000
{
Apple,
Orange,
Strawberry,
Banana,
Blueberry,
}
c# enums
c# enums
asked Nov 23 '18 at 1:25
Iamsodarncool
945
asked Nov 23 '18 at 1:25
Iamsodarncool
945
asked Nov 23 '18 at 1:25
Iamsodarncool
945
asked Nov 23 '18 at 1:25
Iamsodarncool
945
asked Nov 23 '18 at 1:25
Iamsodarncool
945
945
7
Set1000only to first fruit, others fruits will have value incremented by 1
– Fabio
Nov 23 '18 at 1:28
2
Just define the value for your first element (Apple), and you are set. All further elements get values that will be incremented by one. The documentation forenumwill tell you this, too: docs.microsoft.com/en-us/dotnet/csharp/language-reference/…. Or here: docs.microsoft.com/en-us/dotnet/csharp/programming-guide/… Documentation is an amazing thing... ;-)
– elgonzo
Nov 23 '18 at 1:28
1
Note that even if you assign values, technically you can pass any integer as anenum; it just won't correspond to your defined values. That's becasue internally the enum is just compiled to a native type (usuallyint). Meaning if you have a function that accepts aFruitparameter, you could pass any value to it; it doesn't have to be one of your defined values.
– D Stanley
Nov 23 '18 at 1:42
as soon as you start to store values from that enum somewhere (files, a database, ...) and need to maintain a certain degree of version compatibility, you will find that explicitely numbering them and never change a number once assigned is what you want.
– dlatikay
Nov 23 '18 at 2:23
Standard trick to get a range that's useful for validation is to add an extra member, Last = Blueberry. And perhaps you want First = Apple in this case.
– Hans Passant
Nov 23 '18 at 2:31
|
show 1 more comment
7
Set1000only to first fruit, others fruits will have value incremented by 1
– Fabio
Nov 23 '18 at 1:28
2
Just define the value for your first element (Apple), and you are set. All further elements get values that will be incremented by one. The documentation forenumwill tell you this, too: docs.microsoft.com/en-us/dotnet/csharp/language-reference/…. Or here: docs.microsoft.com/en-us/dotnet/csharp/programming-guide/… Documentation is an amazing thing... ;-)
– elgonzo
Nov 23 '18 at 1:28
1
Note that even if you assign values, technically you can pass any integer as anenum; it just won't correspond to your defined values. That's becasue internally the enum is just compiled to a native type (usuallyint). Meaning if you have a function that accepts aFruitparameter, you could pass any value to it; it doesn't have to be one of your defined values.
– D Stanley
Nov 23 '18 at 1:42
as soon as you start to store values from that enum somewhere (files, a database, ...) and need to maintain a certain degree of version compatibility, you will find that explicitely numbering them and never change a number once assigned is what you want.
– dlatikay
Nov 23 '18 at 2:23
Standard trick to get a range that's useful for validation is to add an extra member, Last = Blueberry. And perhaps you want First = Apple in this case.
– Hans Passant
Nov 23 '18 at 2:31
7
7
Set
1000 only to first fruit, others fruits will have value incremented by 1– Fabio
Nov 23 '18 at 1:28
Set
1000 only to first fruit, others fruits will have value incremented by 1– Fabio
Nov 23 '18 at 1:28
2
2
Just define the value for your first element (Apple), and you are set. All further elements get values that will be incremented by one. The documentation for
enum will tell you this, too: docs.microsoft.com/en-us/dotnet/csharp/language-reference/…. Or here: docs.microsoft.com/en-us/dotnet/csharp/programming-guide/… Documentation is an amazing thing... ;-)– elgonzo
Nov 23 '18 at 1:28
Just define the value for your first element (Apple), and you are set. All further elements get values that will be incremented by one. The documentation for
enum will tell you this, too: docs.microsoft.com/en-us/dotnet/csharp/language-reference/…. Or here: docs.microsoft.com/en-us/dotnet/csharp/programming-guide/… Documentation is an amazing thing... ;-)– elgonzo
Nov 23 '18 at 1:28
1
1
Note that even if you assign values, technically you can pass any integer as an
enum; it just won't correspond to your defined values. That's becasue internally the enum is just compiled to a native type (usually int). Meaning if you have a function that accepts a Fruit parameter, you could pass any value to it; it doesn't have to be one of your defined values.– D Stanley
Nov 23 '18 at 1:42
Note that even if you assign values, technically you can pass any integer as an
enum; it just won't correspond to your defined values. That's becasue internally the enum is just compiled to a native type (usually int). Meaning if you have a function that accepts a Fruit parameter, you could pass any value to it; it doesn't have to be one of your defined values.– D Stanley
Nov 23 '18 at 1:42
as soon as you start to store values from that enum somewhere (files, a database, ...) and need to maintain a certain degree of version compatibility, you will find that explicitely numbering them and never change a number once assigned is what you want.
– dlatikay
Nov 23 '18 at 2:23
as soon as you start to store values from that enum somewhere (files, a database, ...) and need to maintain a certain degree of version compatibility, you will find that explicitely numbering them and never change a number once assigned is what you want.
– dlatikay
Nov 23 '18 at 2:23
Standard trick to get a range that's useful for validation is to add an extra member, Last = Blueberry. And perhaps you want First = Apple in this case.
– Hans Passant
Nov 23 '18 at 2:31
Standard trick to get a range that's useful for validation is to add an extra member, Last = Blueberry. And perhaps you want First = Apple in this case.
– Hans Passant
Nov 23 '18 at 2:31
|
show 1 more comment
1 Answer
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0
As @Fabio stated in a comment, enum auto-values are based off the value of the previous enum, so the following code snippets compile identically:
public enum Fruits : uint
{
Apple = 1000,
Orange = 1001,
Strawberry = 1002,
Banana = 1003,
Blueberry = 1004,
}
public enum Fruits : uint
{
Apple = 1000,
Orange,
Strawberry,
Banana,
Blueberry,
}
Thank you @Fabio!
answered Nov 28 '18 at 1:03
Iamsodarncool
945
add a comment |
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0
As @Fabio stated in a comment, enum auto-values are based off the value of the previous enum, so the following code snippets compile identically:
public enum Fruits : uint
{
Apple = 1000,
Orange = 1001,
Strawberry = 1002,
Banana = 1003,
Blueberry = 1004,
}
public enum Fruits : uint
{
Apple = 1000,
Orange,
Strawberry,
Banana,
Blueberry,
}
Thank you @Fabio!
answered Nov 28 '18 at 1:03
Iamsodarncool
945
add a comment |
0
As @Fabio stated in a comment, enum auto-values are based off the value of the previous enum, so the following code snippets compile identically:
public enum Fruits : uint
{
Apple = 1000,
Orange = 1001,
Strawberry = 1002,
Banana = 1003,
Blueberry = 1004,
}
public enum Fruits : uint
{
Apple = 1000,
Orange,
Strawberry,
Banana,
Blueberry,
}
Thank you @Fabio!
answered Nov 28 '18 at 1:03
Iamsodarncool
945
add a comment |
0
0
0
As @Fabio stated in a comment, enum auto-values are based off the value of the previous enum, so the following code snippets compile identically:
public enum Fruits : uint
{
Apple = 1000,
Orange = 1001,
Strawberry = 1002,
Banana = 1003,
Blueberry = 1004,
}
public enum Fruits : uint
{
Apple = 1000,
Orange,
Strawberry,
Banana,
Blueberry,
}
Thank you @Fabio!
answered Nov 28 '18 at 1:03
Iamsodarncool
945
As @Fabio stated in a comment, enum auto-values are based off the value of the previous enum, so the following code snippets compile identically:
public enum Fruits : uint
{
Apple = 1000,
Orange = 1001,
Strawberry = 1002,
Banana = 1003,
Blueberry = 1004,
}
public enum Fruits : uint
{
Apple = 1000,
Orange,
Strawberry,
Banana,
Blueberry,
}
Thank you @Fabio!
answered Nov 28 '18 at 1:03
Iamsodarncool
945
answered Nov 28 '18 at 1:03
Iamsodarncool
945
answered Nov 28 '18 at 1:03
Iamsodarncool
945
answered Nov 28 '18 at 1:03
Iamsodarncool
945
945
add a comment |
add a comment |
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7
Set
1000only to first fruit, others fruits will have value incremented by 1– Fabio
Nov 23 '18 at 1:28
2
Just define the value for your first element (Apple), and you are set. All further elements get values that will be incremented by one. The documentation for
enumwill tell you this, too: docs.microsoft.com/en-us/dotnet/csharp/language-reference/…. Or here: docs.microsoft.com/en-us/dotnet/csharp/programming-guide/… Documentation is an amazing thing... ;-)– elgonzo
Nov 23 '18 at 1:28
1
Note that even if you assign values, technically you can pass any integer as an
enum; it just won't correspond to your defined values. That's becasue internally the enum is just compiled to a native type (usuallyint). Meaning if you have a function that accepts aFruitparameter, you could pass any value to it; it doesn't have to be one of your defined values.– D Stanley
Nov 23 '18 at 1:42
as soon as you start to store values from that enum somewhere (files, a database, ...) and need to maintain a certain degree of version compatibility, you will find that explicitely numbering them and never change a number once assigned is what you want.
– dlatikay
Nov 23 '18 at 2:23
Standard trick to get a range that's useful for validation is to add an extra member, Last = Blueberry. And perhaps you want First = Apple in this case.
– Hans Passant
Nov 23 '18 at 2:31