请教.net mvc 中linq如何实现这个功能？

Question

最近参考网上代码：

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

namespace WMVC.Models
{
    public class RepositoryTest<T> where T : class
    {

        public DataContext context;
        public RepositoryTest(DataContext context)
        {
            this.context = context;
        }
        public IEnumerable<T> FindAll(Func<T, bool> exp)
        {
            return context.GetTable<T>().Where(exp);
        } 
    }
}

 

可以实现： 

DataContext content = new MyDataContext();
RepositoryTest rp = new RepositoryTest<my_tbl>(DataContext);
rp.FindAll(t => t.name == "jack"));
return View(rp);

 

 

 

那么下面我想实现： 

DataContext content = new MyDataContext();
RepositoryTest rp = new RepositoryTest<my_tbl>(DataContext);
rp.FindAll(1,t => t.name == "jack")); //这里多加了一个条件
return View(rp);

 

我修改了代码如下，但是无法编译，请教各位前辈应该如何修改，谢谢！

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

namespace WMVC.Models
{
    public class RepositoryTest<T> where T : class
    {

        public DataContext context;
        public RepositoryTest(DataContext context)
        {
            this.context = context;
        }
        public IEnumerable<my_tbl> FindAll(int pid, Func<my_tbl, bool> exp)
        {
            var result = from a in context.GetTable<my_tbl>()
                         where a.parent_id == pid
                         select a;

            //result.Where(t=>t.name == "jack"); 可通过
            //result.Where(exp);    出错
            return result;
        } 
    }
}

 

实际方法定义代码如下：

        public IEnumerable<MenuClasses> listBom(int? id,Func<MenuClasses, bool> exp)
        {
            id = id == null ? 0 : id;
            SourceClassDataContext s = (SourceClassDataContext)context;
            var result = from a in s.GetTable<tbl_SourceClasses>()
                         join b in s.class_f_Cid(id) on
                         a.id equals b.id into prods
                         from b in prods
                         orderby b.temp_orderby
                         select new MenuClasses()
                         {
                             id = a.id,
                             parent_id = a.parent_id,
                             class_order = a.class_order,
                             class_name = a.class_name,
                             temp_orderby = b.temp_orderby,
                             Level = b.Level

                         };
            //result = result.Where(b => b.Level == 1);    //可通过
            //result = result.Where<MenuClasses>(exp);     //无法通过
            return result;
        }