带有WHERE子句和布尔值的C＃Mvc实体框架问题

Question

有人可以帮我调整下面的语法吗？ 我不断收到一条错误消息，指出“错误403'bool'不包含'ToList'的定义，并且找不到扩展方法'ToList'接受类型为'bool'的第一个参数（您是否缺少using指令或程序集参考？）”

var workerRecords =
    from oe in context.tbl_Company_Workers.ToList() 
    where( 
        w => w.WorkerRoleID.HasValue && w.WorkerRoleID == 3
    ).ToList();

Answer 1

var workerRecords =
    (from oe in context.tbl_Company_Workers 
    where w.WorkerRoleID.HasValue && w.WorkerRoleID == 3
    select oe).ToList();

Answer 2

如果严格选择3，为什么需要w.WorkerRoleID.HasValue？

var workerRecords =
    (from oe in context.tbl_Company_Workers.ToList() 
    where oe.WorkerRoleID == 3 select oe
    ).ToList();

Answer 3

请使用语句进行检查

using System.Collections.Generic;
using System.Linq;
using System.Data.Linq;


/// <summary>
/// Summary description for Class1
/// </summary>
public class Class1
{
 public void MethodName()
   {
    var workerRecords = context.tbl_Company_Workers.where(cw =>     w.WorkerRoleID.HasValue && w.WorkerRoleID.Value == 3).ToList();
    }
 }