How to render Max(Substring) with Lambda Extensions

Posted by caifa on Stack Overflow See other posts from Stack Overflow or by caifa
Published on 2010-05-27T22:37:44Z Indexed on 2010/05/28 7:31 UTC
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c#

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nhibernate

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criteria

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nhlambdaextensions

Hi everybody. I'm using NHibernate with Lambda Extensions. I'd like to know how to nest a Max function with a Substring.

The following statement retrieves Max("invoice_id")

var ret = session
          .CreateCriteria<Invoice>()
          .SetProjection(Projections.Max("invoice_id"))
          .UniqueResult();

but in my case the field invoice_id is made in this way: 12345.10 where 12345 is the invoice number, and 10 refers to the current year (2010). So I need to calculate the Max function only over the first 5 digits. How can I do it?

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