Shaping Entity Framework Results

In order to comply with an interface I needed to write code similar to the following:

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1. return (from ActionRule ar in db.ActionRuleSet.Include("ConditionExpression")  
2.         select new ActionRuleDataDTO()              
3.         {                  
4.             Expresions = (from ConditionExpression ce in ar.ConditionExpression  
5.                           select new  RuleExpressionDTO()  
6.                           {  
7.                               Type = ce.Operator,  
8.                               BoolOperator = ce.NextExpressionOperator  
9.                           }).ToArray()              
10.         }).ToArray();   

<br />return (from ActionRule ar in db.ActionRuleSet.Include("ConditionExpression")<br /> select new ActionRuleDataDTO() <br /> { <br /> Expresions = (from ConditionExpression ce in ar.ConditionExpression<br /> select new RuleExpressionDTO()<br /> {<br /> Type = ce.Operator,<br /> BoolOperator = ce.NextExpressionOperator<br /> }).ToArray() <br /> }).ToArray(); <br /> Which results in:
LINQ to Entities does not recognize the method 'EhrAdmin.Services.MSSQL.DTO.RuleExpressionDTO[] ToArray[RuleExpressionDTO](System.Collections.Generic.IEnumerable`1[EhrAdmin.Services.MSSQL.DTO.RuleExpressionDTO])' method, and this method cannot be translated into a store expression.
I'll revisit this when i get a chance but the fix at the moment is to convert ObjectQuery<actionrule> to List<actionrule> using the ToList() method.