Summing values

Permanently deleted user

3. Oktober 2014 01:00

Total nubie here with no programming experience.

 

First off, I found another post that has an example of summing values from a QueryTask using a ForEach <Graphic> with an assign -- sum + Double.Parse(item.attributes("C1_SCHED").ToString())  but it doesn't work... Sigh.

 

Can someone please give me an example of a working sum for a selection from the Query Task? I usually don't have any problem figuring out workflow but this one is driving me insane!

 

Thank you,

 

JB

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  Permanently deleted user

  3. Oktober 2014 05:04

  Hi bake 7734

  Are you getting an error?

  What was it?

  Do you have a field in your QueryTask results called C1_SCHED?

  Do you have values in that field that are unable to be converted to to a Double?

  Have you declared a variable called sum to a Double DataType?

  Regards

  Ralph

   

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  Permanently deleted user

  7. Oktober 2014 21:09

  Hi Ralph,

  Thank you for the reply. I found that I could assign "sum + CType(item.attributes("C1_SCHED"), double)" to convert the number correctly.

  JB

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  Berend Veldkamp

  4. November 2014 20:49

  Just a small addition: If you have ArcGIS Server 10.1, and all you want is to do is calculate the sum of a field, but don't need the actual features, you can use the OutStatistics property of the QueryTask. Set it for instance to this value:

  New List(Of OutStatistic) From { New OutStatistic("C1_SCHED", "SUM_SCHED", StatisticType.Sum) }

  to get the summed values. The resulting featureset will have one column called 'SUM_SCHED', with one record containing the value. (You should also set 'Where' to some valid value, e.g. 0=0)

  The advantage is that this works with any number of features, even if there are more than whatever the maximum number in the mapservice is set to.

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