Question

我有以下代码，我试图使用LINQ创建CompiledQuery。

public static Func<DataContext, int, object>
        GetTeamMembersByTeamId = CompiledQuery.Compile<MazikReviewEntities, int, object>(
            (context, teamId) => from tp in context.TeamPlayers
                                    join t in context.Teams on tp.TeamId equals t.ID
                                    join emp in context.Employees on tp.EmployeeId equals emp.ID
                                    where tp.TeamId == teamId && emp.IsActive == true
                                    orderby emp.JoiningDate
                                    select new ProjTeamMemberDetails
                                    {
                                        EmployeeName = emp.FirstName + " " + emp.LastName,
                                        Email = emp.Email,
                                        Designation = context.Designations.FirstOrDefault(s => s.ID == emp.DesignationId).Name,
                                        NIC = emp.NIC,
                                        JoiningDate = emp.JoiningDate,
                                        EmployeeID = emp.ID
               });

}

在CompiledQuery.Compile行中，我的datacontext出现错误，指出

“类型'MazikGlobalReviewModel.MazikReviewEntities'不能在泛型类型或方法'System.Data.Linq.CompiledQuery.Compile（System.Linq.Expressions.Expression＆gt;）'中用作类型参数'TArg0'。没有从'MazikGlobalReviewModel.MazikReviewEntities'到'System.Data.Linq.DataContext'的隐式引用转换。“

这是什么错误以及如何解决这个问题？

Answer 1

我的朋友来自Mazik。如果你看一下错误就很清楚那里有什么问题。看看下面的代码。你的代码中的datacontext和MazikReviewEntities是什么。确保它们属于同一类型。

 public static readonly Func<**MyDataContext**, int, IQueryable<tblSomething>> CompiledSelectSites =
                CompiledQuery.Compile((**MyDataContext** c, int conf_id) =>
                        (from s in c.TblSomething
                         where s.ID == id
                         select site));

有关详情请见link。

这可以解决您的问题。

ADO.net实体模型框架编译查询问题

1 个答案: