How to get the name of combined values in structure?

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Here is the structure values:

VB

Public Structure IntValues
 Public Shared MP2 As Integer = 1
 Public Shared MP3 As Integer = 2
 Public Shared MP4 As Integer = 4
 Public Shared MOV As Integer = 16
 Public Shared OGG As Integer = 256
 Public Shared WAV As Integer = 512
End Structure

And when I have a value equal to 261 ( 1+4+256 ) I want to get the name of these combined values ( which are MP2,MP4,OGG )
And I do not know which is better to use, Enum or Structure? And
how to do that?

Posted 25-Jul-13 8:10am

Leecherman

Updated 25-Jul-13 9:13am

ZurdoDev

v5

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CHill60 25-Jul-13 14:14pm

How are you storing this "structure"?

Leecherman 25-Jul-13 14:16pm

hmmm, I don't know which is better to use, Enum or Structure

here is it:

Public Structure IntValues
Public Shared MP2 As Integer = 1
Public Shared MP3 As Integer = 2
Public Shared MP4 As Integer = 4
Public Shared MOV As Integer = 16
Public Shared OGG As Integer = 256
Public Shared WAV As Integer = 512
End Structure

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Sergey Alexandrovich Kryukov · Accepted Answer · 2013-07-25T10:43:00

This is wrong approach. Instead, use the enumeration type, each enumeration member integer value assigned to 1, 2, 4, etc. You will be able to perform binary arithmetic on enumeration members as they were simple integers. Now, if you also add a [Flags] attribute to such type, the method ToString will simply output the string with several comma-separated names of enumeration value, representing the ORed result of the values. Please see:
http://msdn.microsoft.com/en-us/library/system.flagsattribute.aspx[^].

And if you need more detail or want more advanced techniques of working with enumerations, especially those representing bit sets, please read two of my articles where I describe the related problem in detail, and describe the standard techniques and also provide some advanced techniques, such as traversing the set of enumeration members (enumerating them, which is quite amazingly, is not directly supported by enumeration types), customized string representation of enumeration values, and more:
Enumeration Types do not Enumerate! Working around .NET and Language Limitations[^],
Human-readable Enumeration Meta-data[^].

—SA