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Custom Field Type

  Asked By: Anushka    Date: Oct 14    Category: Sharepoint    Views: 1430

I am working on a Custom Field Type and I have run into a road block.
I need to create a column very similar to a calculated column.
Currently my field inheriting from SPFieldNumber because it needs to
"be" a number. Mostly because numeric view aggregations are not
available for calculated columns. The problem is I can't find where to
do the calculation. I tried to override the Value property of the
FieldRenderingControl, but that is only used when an item is edited
form the web interface. Microsoft does it somehow (calculated fields)
I just can't find the right method to override.



2 Answers Found

Answer #1    Answered By: Harshini Raju     Answered On: Oct 14

Sorry, I don't understand your question. Why are you trying to "do the
calculation"? Are you sure that this can't be accomplished using out of
the box functionality?

Answer #2    Answered By: Christop Mcfadden     Answered On: Oct 14

My ultimate goal is to be able to use the Totals section of a view  to
calculate the average of a calculated  number. The problem  is that out
of the box calculated columns  do not show up in the Totals section. My
proposed solution to this is to create  a custom  field type  inheriting
from SPFieldNumber that mimics the functionality of a calculated column
for numbers only.

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