public class Book { [Key] [DatabaseGenerated(DatabaseGeneratedOption.Identity)] public int Id { get; set; } [Required, MaxLength(50)] public string Title { get; set; } public Double? Price { get; set; } }
解决方案一：
var bkList = db.Books.Select(allBooks => new { Id = allBooks.Id, Title = allBooks.Title }).Select(b => new Book { Id=b.Id,Title=b.Title});
解决方案二：
var bkList2 = db.Books.Select(allBooks => new { Id = allBooks.Id, Title = allBooks.Title }).ToList().ConvertAll<Book>(b => new Book(){ Id=b.Id,Title=b.Title});
解决方案三：
//声明一个与Book一模一样的克隆类 public class BookClone { public int Id { get; set; } public string Title { get; set; } public Double Price { get; set; } } var bkList3 = db.Books.Select(allBooks => new BookClone { Id = allBooks.Id, Title = allBooks.Title });
这三种方案都可以解决The entity or complex type '{0}' cannot be constructed in a LINQ to Entities query. 的异常
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