How to render Max(Substgring) 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 2010/05/27 22:41 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: 123452010 where 12345 is the invoice number, and 2010 is the current year. So I need to calculate the Max function only over the first 5 digits. How can I do it?

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