C# WPF ChildObservableCollection CRUD -

i create listbox(main) , listbox have datatemplate binding observablecollection.

also, listbox have many listbox(child), binding child observablecollection.

---

*observablecollection < list >

　　-(int)id

　　-(string)data

　　-(class)a

　　-observablecollection < list2 >

　　　　　-(int)list2_id

　　　　　-(string)sdata1

　　-observablecollection < list3 >

　　　　　-(int)list3_id

　　　　　-(string)sdata2

　　-observablecollection < list4 >

　　　　　-(int)list4_id

　　　　　-(string)sdata3

...

---

list2 nlst = new list2();

nlst.id = 1;

list.list2.add(nlst); //set child observablecollection.

the childobservable cannot set in case:

        public observablecollection<childclass> cc         {                         {                 return mainlist._cc;             }             set             {                 onpropertychanged();             } 

however updated to:

        public observablecollection<childclass> cc         {                         {                 return mainlist._cc;             }             set             {                 foreach (var tmp in value)                 {                     bool found = false;                     bool edit = false;                     foreach (var ct in mainlist._cc)                     {                         if(ct.id == tmp.id)                         {                             found = true;                             if (!object.referenceequals(tmp, ct))                             {                                 edit = true;                             }                         }                     }                     if (found)                     {                         if (edit)                         {                             //update                             ct.id = tmp.id;                             ct.status = tmp.status;                          ...                         }                     }                     else                     {                         if(tmp.status == -1)                         {                             mainlist._cc.remove(tmp);                         }                         else                         {                             mainlist._cc.add(tmp);                         }                     }                 }                  onpropertychanged();             } 

it can add,update,delete ..

but need 2 for-each checking , performance low...