C＃，LINQ，實體框架4：分割表中，以使用LINQ

Question

二維陣列我有一個實體是這樣的：

public class Category 
{ 
    public int classid {get;set;} 
    public int itemid {get;set;} 
    public string label {get;set;} 
} 

因此，一個列表生成此JSON（三種尺寸和三種顏色

[{"classid":1,"itemid":1,"label":"Small"}, 
{"classid":1,"itemid":2,"label":"Medium"}, 
{"classid":1,"itemid":3,"label":"Large"}, 

{"classid":2,"itemid":1,"label":"Blue"}, 
{"classid":2,"itemid":2,"label":"Green"}, 
{"classid":2,"itemid":3,"label":"Red"}, 

{"classid":3,"itemid":1,"label":"Tee"}, 
{"classid":3,"itemid":2,"label":"Golf"}, 
{"classid":3,"itemid":3,"label":"Dress"}] 

但是JavaScript客戶端需要這樣的myarray[][].label：

[[{"itemid":1,"label":"Small"}, 
    {"itemid":2,"label":"Medium"}, 
    {"itemid":3,"label":"Large"}], 

[{"itemid":1,"label":"Blue"}, 
    {"itemid":2,"label":"Green"}, 
    {"itemid":3,"label":"Red"}], 

[{"itemid":1,"label":"Tee"}, 
    {"itemid":2,"label":"Golf"}, 
    {"itemid":3,"label":"Dress"}]] 

而且這是在我的Linq查詢的中間點擊。

我該如何構建Linq查詢來從Linq中的一維數組中組裝二維數組？

編輯：現有的查詢：

... 
CATS = (from myP in myProduct.ProductCategories 
     select new ProductCategory 
     { 
      classid = myP.classid, 
      itemid = myP.itemid, 
      label = myP.label 
     }), 
... 

編輯：越來越近：

CATS = (from myP in myProduct.ProductCategories 
     group myP by myP.classid into groups 
     select new resultClass 
     { classid = groups.Key, 
       opts = groups.Select(x => 
       new ProductOption 
       { itemid = x.itemid, 
       label = x.label}) }), 

Answer 1

我沒有測試過這一點，但它是自己熟悉的領域，並應工作：

IEnumerable<Category> items = ...; 
var groups = items.GroupBy(x => x.classid); 
var arrays = groups.Select(x => 
    x.Select(y => new { itemid = y.itemid, label = y.label }).ToArray() 
).ToArray();