Checking the value against enumeration

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I have enumeration like this:

C#

 public enum returnCodes
        {

            Success = 0,
            Timeout = 1,
            GeneralReject = 0x10,
            ServiceNotSupported = 0x11,
            SubFunctionNotSupported = 0x12,
            InvalidMessageLength = 0x13,
            BusyRepeatRequest = 0x21
}

I have a result that is byte array. I want to check if 3rd byte out there is among any of the values in enumeration. If yes then display some message.
For that i can individually check each value like this:

C#

if (_receivedFrame.Data[2] == (int)returnCodes.GeneralReject)
           {
               MessageBox.Show("first");
           }
           else if (_receivedFrame.Data[2] == (int)returnCodes.Success)
           {
               MessageBox.Show("second");
           }

But i want to know if there is any efficent way of coding where i can compare 3rd byte with all values in enumaration.

Posted 14-Sep-11 3:04am

glued-to-code

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#realJSOP · Accepted Answer · 2011-09-14T03:17:00

Solution 1

I wrote a tip/trick for this:

Setting Enumerators From Questionable Data Sources (for C# and VB)[^]

You would use it this way:

C#

if (IntToEnum(_receivedFrame.Data[2], returnCodes.GeneralReject) == returnCodes.Success)
{
    // do something

}

Posted 14-Sep-11 3:17am

#realJSOP

Updated 14-Sep-11 3:36am

v2

Comments

Rick Shaub 14-Sep-11 9:22am

Good tip. I was going to mention Enum.IsDefined, but it looks like you got it covered.

glued-to-code 15-Sep-11 2:33am

Thanks for this answer, but i wanted a way wherein we can compare 3rd byte to all enum values available. like comparing 3rd byte to firste num value, second enum value.. to the last enum value. If none of the enum values matches 3rd byte, it should not do anything, otherwise it should return the particular enum value

Rick Shaub · Accepted Answer · 2011-09-15T03:30:00

Solution 3

You could use Enum.GetValues :

C#

var enumValues = Enum.GetValues(typeof(returnCodes));
foreach (object enumValue in enumValues)
{
   if((returnCodes)enumValue == _receivedFrame.Data[2])
   {
       //Do something
   }
}

Alternately, you could load a Dictionary in the static constructor and just look up the string to return.

Posted 15-Sep-11 3:30am

Rick Shaub

Comments

glued-to-code 16-Sep-11 5:26am

Thank you very much!