How to get enum value;

Question

I have the following enums:

Days:

Sunday    1
Monday    2
Tuesday   4
Wednesday 8
Thursday  16
Friday    32
Saturday  64

WeekOfMonth

First     256
Second    512
Third     1024
Fourth    2048

I have, for example, the number 514 which is a sum of 512(Second) +2(Monday).

How can I get Second & Monday if I only have the number 514?

What are you trying to do? Do you need an enumeration there? Seems like there is either a sequence or a logic involved, perhaps you can write some code instead. — pavanred
– pavanred, Commented Jul 3, 2012 at 12:17

Martin Liversage · Accepted Answer · 2012-07-03 12:21:15Z

6

Assuming the following definitions:

[Flags]
enum Days {
  Sunday = 1,
  Monday = 2,
  Tuesday = 4,
  Wednesday = 8,
  Thursday = 16,
  Friday = 32,
  Saturday = 64
}

[Flags]
enum WeekOfMonth {
  First = 256,
  Second = 512,
  Third = 1024,
  Fourth = 2048
}

You can get the desired string using this code:

var value = (Int32) WeekOfMonth.Second + (Int32) Days.Monday; // 514
var days = (Days) (value & 0xFF);
var weekOfMonth = (WeekOfMonth) (value & 0xFF00);
var str = String.Format("{0} & {1}", weekOfMonth, days);

The variable str will contain Second & Monday as desired.

The [Flags] attribute is important if you want to be able to combine several Days values or WeekOfMonth values. For instance ((Days) 3).ToString() will return Sunday, Monday. If you forget the [Flags] attribute the string returned is 3.

edited Jul 3, 2012 at 12:21

answered Jul 3, 2012 at 12:16

Martin Liversage

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2 Comments

dash Over a year ago

Gah - I was just typing that! +1 ;-)

James Zalame Over a year ago

Well, in my code i have added the [Flags], Just forgot to post it. :(

Amith George · Accepted Answer · 2012-07-03 12:18:56Z

0

You could do a logical AND against each possible value. All values that return non zero are the ones that you want.

var finalValue = ... // 512 -> 1000000010
var possibleValues = ... // array of flags [00000001, 000000010, 00000100, 00001000 ... ]

var appliedFlags = possibleValues.Where(x => x & finalValue == x).ToList();

edited Jul 3, 2012 at 12:18

answered Jul 3, 2012 at 12:11

Amith George

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1 Comment

Amith George Over a year ago

Thanks for the accepting the answer. Personally I like @Martin's answer more. I just wish I had thought of that :P

Mohamed Farrag · Accepted Answer · 2012-07-03 12:15:27Z

0

well I have an idea as I can see it seems to be binary sequence , so you can subtract this number 514 to the nearest binary which will be 512 then do the same process to the remaining until you got 0.

answered Jul 3, 2012 at 12:15

Mohamed Farrag

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Comments

Dominik Kirschenhofer · Accepted Answer · 2012-07-03 12:20:59Z

0

Untested but should work: Take the number and divide it by the int value of the first WeekOfMonth value. The result will be a double, ignore everthing behind the comma. Now you have the value for WeekOfMonth. Afterwards use mod (%) division to get the rest of the division to get the remaining value which represtns your Days value.

In code:

var intValue = (int)WeekOfMonth.Second + (int)Days.Monday; //514
var weekOfMonth = (WeekOfMonth)Convert.ToInt32(intValue / (int)WeekOfMonth.First);
var day = (Days)(intValue % (int)WeekOfMonth.First);

I'm not sure if all the casts are working but it should give you the idea ;)

answered Jul 3, 2012 at 12:20

Dominik Kirschenhofer

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