有没有办法让where条件变为可选

[IE11下面经常卡到爆]

//下面是目前的办法
//当((int.TryParse(dishID, out menuId) && menuId > 0)条件不满足时，直接join返回
//否则约束条件where cook.menuId == menuId
var cookData = from cook in cookList join annote in annotateL on cook.noteId equals annote.id where
     ((int.TryParse(dishID, out menuId) && menuId > 0) ? cook.menuId == menuId : cook.menuId > 0)
     select new { cook, annote.name 
};
if (cookData != null && cookData.Count() > 0)
{
    List<CookMethod> cookMethodList = new List<CookMethod>(cookData.Count());
    foreach (var cookdata in cookData)
    {
        CookMethod cm = new CookMethod();
        cm.ID = cookdata.cook.noteId;
        cm.DishID = cookdata.cook.menuId;
        cm.Content = cookdata.name;
        cookMethodList.Add(cm);                            
    }
    return cookMethodList;
}

需求：有没有简单办法实现类似，数据不在数据库中，无法使用SQL
Type cookData;
if(条件）
cookData = select new {};
esle
cookData = where .. select new {};
想过：var cookData = from...join on..select new {};
if(条件 && cookData != null)
cookData = cookData.Where(cd => cd.cook.menuId == menuId); 但是这样join之后再where感觉有点傻

[teddy000]

when.

[IE11下面经常卡到爆]

刚又想了下，自己绕进去了

var cookData = (int.TryParse(dishID, out menuId) && menuId > 0)
               ? (from cook in cookList join annote in annotateL on cook.noteId equals annote.id where cook.menuId == menuId select new { cook, annote.name })
               : (from cook in cookList join annote in annotateL on cook.noteId equals annote.id select new { cook, annote.name });      

这样就可以了