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POLinq-to-NHibernate String/DateTime Conversion in Where
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  1. POLinq-to-NHibernate String/DateTime Conversion in Where
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    copied!<p>I'm just starting out with Linq to NHibernate and having troubles with a pretty simple query. I have a database column that is defined as a varchar. In the linq query I need to compare that value to a datetime value (all of the values stored in the varchar column are valid dates). I'm trying this:</p> <pre><code>var list = (from o in session.Linq&lt;ObjectName&gt;() where Convert.ToDateTime(o.ColumnName) &gt;= startDate select o).ToList(); </code></pre> <p>When using Convert.ToDateTime I get this exception:</p> <p>Cannot use subqueries on a criteria without a projection.</p> <pre><code>at NHibernate.Criterion.SubqueryExpression.ToSqlString(ICriteria criteria, ICriteriaQuery criteriaQuery, IDictionary`2 enabledFilters) at NHibernate.Criterion.Junction.ToSqlString(ICriteria criteria, ICriteriaQuery criteriaQuery, IDictionary`2 enabledFilters) at NHibernate.Loader.Criteria.CriteriaQueryTranslator.GetWhereCondition(IDictionary`2 enabledFilters) at NHibernate.Loader.Criteria.CriteriaJoinWalker..ctor(IOuterJoinLoadable persister, CriteriaQueryTranslator translator, ISessionFactoryImplementor factory, ICriteria criteria, String rootEntityName, IDictionary`2 enabledFilters) at NHibernate.Loader.Criteria.CriteriaLoader..ctor(IOuterJoinLoadable persister, ISessionFactoryImplementor factory, CriteriaImpl rootCriteria, String rootEntityName, IDictionary`2 enabledFilters) at NHibernate.Impl.SessionImpl.List(CriteriaImpl criteria, IList results) at NHibernate.Impl.CriteriaImpl.List(IList results) at NHibernate.Impl.CriteriaImpl.List() at NHibernate.Linq.CriteriaResultReader`1.List() at NHibernate.Linq.CriteriaResultReader`1.&lt;GetEnumerator&gt;d__0.MoveNext() at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection) at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source) </code></pre> <p>This is with 1.0.0.4000 of NHibernate.Linq.</p>
 

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