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Render names of C# bitfields using enums and FlagsAttribute. Also, adjusting size of enum using, like ushort, for marshalling p

/ Published in: C#
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FlagsAttribute is useful to render a string indicating which status bits or flag bits are turned on. The resulting string will contain the name of the enum bit that is turned on without needed to maintain a separate string table.

Note the inheritance-like syntax that determines the size of the enum. This is useful to adjust the size of enum structure members for marshaling with C.

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  1. // Given this enum...
  2.     [FlagsAttribute] 
  3.     enum MyStatus: ushort
  4.     {
  5.         Bit0 = 0x0000,
  6.         Bit1 = 0x0001,
  7.         Bit2 = 0x0002,
  8.         Bit3 = 0x0004
  9.     };
  10.  
  11.  
  12. // Cast a 0x7 to MyStatus and render a string for testing/demonstration purposes:
  13. ((MyStatus)0x7).ToString() results in string "Bit0, Bit1, Bit2"
  14.  
  15. // To test a bit, use code of the form. Assumes status is a MyStatus.
  16. if ( Convert.ToBoolean( status & MyStatus.Bit0) )

URL: http://msdn.microsoft.com/en-us/library/system.flagsattribute%28VS.71%29.aspx

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