[LINQ] Contains Except Sample

[LINQ] Contains Except Sample 
Contains 

Ex1:
var uids = arrayofuids.Select(id => int.Parse(id)).ToList();
var selected = table.Where(t => uids.Contains(t.uid));

Ex2:
//用輸入的List ID 去DB找對應的ID
 var dbItemSearchList = db.Item.Where(x => modelItemIDList.Contains(x.ID)).OrderBy(x => x.ID).ToList();

Except

//輸入5筆，DB有5筆，回傳True
 bool hasMatch = ! modelList.Select(x => x.ItemID).Except(dbItemSearchList.Select(y => y.ID)).Any();

//輸入5筆，DB只有4筆，回傳沒有的那一筆資料
 var dbItemSearchList = db.Item.Where(x => modelItemIDList.Contains(x.ID)).OrderBy(x => x.ID).ToList();