帶有WHERE子句和布爾值的C＃Mvc實體框架問題

Question

有人可以幫我調整下面的語法嗎？ 我不斷收到一條錯誤消息，指出“錯誤403'bool'不包含'ToList'的定義，並且找不到擴展方法'ToList'接受類型為'bool'的第一個參數（您是否缺少using指令或程序集參考？）”

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

如果嚴格選擇3，為什么需要w.WorkerRoleID.HasValue？

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

Answer 3

請使用語句進行檢查

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();
    }
 }