reporting services - How to use Floor/Ceiling in a ReportModel expression field? -

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I am working in a SSR 2005 Report Model Project I want to create an expression field on a ReportModel which is similar to this C # method: 

  Private Static IntervalValnetworkTwitter 0 (double delta) {return (int (delta)? Math: Roof (Delta): Math. Floor (Delta)); }

I tried to do this: 

  IF (delta> 0, terrace (delta), bottom (delta))

But it seems that ReportModel expressions do not support ceiling or floor functions. Is there any way to do this?

Update : Due to changing the requirements for adding additional complexities in this report, I am going to start with the Report Designer in Visual Studio. So I should be able to use Math.Ciling () and Math.Floor () in the field of an expression on the report.

This is actually supported. Use the following expression: 

  = IIF (delta> 0, roof (delta), bottom (delta))

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