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Editorial Team
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Asked: 2026-05-15T14:15:32+00:00

using SubSonic3 SimpleRepository; I have a table used for an email queue which has

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using SubSonic3 SimpleRepository;

I have a table used for an email queue which has a SentOn DATETIME column that allows nulls. Using the following Lambda expressions have yielded me errors, does anyone have any ideas how to select a list from the table were the column is null.

IList<Email> emails = _repo.Find<Email>(x => x.SentOn == null);
IList<Email> emails = _repo.Find<Email>(x => !x.SentOn.HasValue);
IList<Email> emails = _repo.Find<Email>(x => x.SentOn.Value.Equals(null));

Surely there is a simple way to achieve this, not like it’s a edge case. I think my limited lambda/linq knowledge is the problem here.

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1 Answer

  1. Editorial Team

    Without knowing the error you encounter I’m guessing it is because you are writing LINQ code to be executed by C# but you are passing it to SubSonic to convert it into SQL.

    A solution is in this question which basically involves querying the SQL db for all results then using a LINQ query within C# after.

    Alternatively you should be able to do a (pseudocode) .Where(fieldName).IsNull similar to SubSonic 2.0

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