Question

您好我有这样的查询：

var queryGridData = from question in questions
   select new {
      i = question.Id,
      cell = new List<string>() { question.Id.ToString(), question.Note, question.Topic }
   };

转换ToString()所需的int部分导致：

LINQ to Entities does not recognize the method 'System.String.ToString()' method, and this method cannot be translated into a store expression.

Hmmmmmmmmmmm。我需要string进入collection。有什么想法吗？

Answer 1

我个人会在数据库中执行足够的查询以提供您想要的值，并在.NET中完成其余的工作：

var queryGridData = questions.Select(q => new { q.Id, q.Note, q.Topic })
                             .AsEnumerable() // Do the rest locally
                             .Select(q => new { i = q.Id,
                                                cell = new List<string> { 
                                                    q.Id.ToString(),
                                                    q.Note,
                                                    q.Topic
                                                } });

（这种格式很糟糕，但希望在你有更多空间的IDE中做得更好：）

Linq to Entities例外

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