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2013-05-13T14:21:45.120
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<p>Encountered a similar problem as the original poster, where "Order By" expressions where written as lambdas of the type Expression<Func<T, object>>. These were interpreted correctly by the NHibernate linq provider, but migrating to EF 5 resulted in "Unable to cast the type 'System.DateTime' to type 'System.IComparable'. LINQ to Entities only supports casting Entity Data Model primitive types."</p> <p>The following methods provide a conversion to Expression<Func<T, TKey>> when calling the various "OrderBy" methods (using reflection - apologies...) Note they were originally encapsulated in a generic class OrderBy<T>.</p> <pre><code> private static readonly Type QueryableType = typeof(Queryable); // HACK: Use reflection to call strongly-typed methods instead of object-based methods // This is to work around "Unable to cast the type 'System.DateTime' to type 'System.Object'. LINQ to Entities only supports casting Entity Data Model primitive types." private IOrderedQueryable<T> ApplyOrderByTo( IQueryable<T> query, Expression<Func<T, object>> keySelector, bool sortAscending, bool useReflection) { if (useReflection) { var body = keySelector.Body as UnaryExpression; var keyExpr = body.Operand as MemberExpression; return (IOrderedQueryable<T>)query.Provider.CreateQuery( Expression.Call( QueryableType, sortAscending ? "OrderBy" : "OrderByDescending", new Type[] { typeof(T), keyExpr.Type }, query.Expression, Expression.Lambda(keyExpr, keySelector.Parameters))); } else { if (sortAscending) return query.OrderBy(keySelector); else return query.OrderByDescending(keySelector); } } // HACK: Use reflection to call strongly-typed methods instead of object-based methods // This is to work around "Unable to cast the type 'System.DateTime' to type 'System.Object'. LINQ to Entities only supports casting Entity Data Model primitive types." private IOrderedQueryable<T> ApplyOrderByTo( IOrderedQueryable<T> query, Expression<Func<T, object>> keySelector, bool sortAscending, bool useReflection) { if (useReflection) { var body = keySelector.Body as UnaryExpression; var keyExpr = body.Operand as MemberExpression; return (IOrderedQueryable<T>)query.Provider.CreateQuery( Expression.Call( QueryableType, sortAscending ? "ThenBy" : "ThenByDescending", new Type[] { typeof(T), keyExpr.Type }, query.Expression, Expression.Lambda(keyExpr, keySelector.Parameters))); } else { if (sortAscending) return query.ThenBy(keySelector); else return query.ThenByDescending(keySelector); } } </code></pre>
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