无法创建“System.Object”类型的常量值

Question

代码

 using (TimeTableEntities obj = new TimeTableEntities())
    {
     var dataM=obj.LoginAccesses.Where(i =>(i.Salutation + ' ' + i.Fname + ' ' + i.Lname) == fname).ToList();
     foreach(var countTemp in dataM)
       {
        //mycode
       }
     }

异常

"Unable to create a constant value of type 'System.Object'. Only primitive types or enumeration types are supported in this context."

当我尝试没有where子句时，它对我来说很好，但当我添加它显示在Exception上面的地方

提前致谢

Answer 1

在您的实体中创建新的Proprty

[DatabaseGenerated(DatabaseGeneratedOption.Computed)]
 public string MyCombinationData{
    get{
          return Salutation  + ' ' + Fname + ' ' + Lname
    }
}

并在您的查询中使用此：

 var dataM=obj.LoginAccesses.Where(i =>i.MyCombinationData == fname).ToList();