C# 兩個List泛型用 Linq去重複資料 或者 得到重複資料

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1, 兩個List泛型用Linq去重複資料

Code:

            List<string> lstA = new List<string> { "E00401501B652563", "E00401501B652564", "E00401501B652565", "E00401501B652566", "E00401501B652567", "E00401501B652568" };            List<string> lstB = new List<string> { "E00401501B652563", "E00401501B652564", "E00401501B652565", "E00401501B652566", "E00401501B652567", "E00401501B652568", "E00401501B652569" };            List<string> newList = lstA.FindAll(x => !lstB.Contains(x));            foreach (var item in newList)            {                Console.WriteLine(item);            }            Console.ReadKey();

 

控制台運行結果

圖1

 

圖1 為什麼會出現這個情況，什麼都沒有輸出。下面修改下程式，請看2

 

2，先看 Code:

            List<string> lstA = new List<string> { "E00401501B652563", "E00401501B652564", "E00401501B652565", "E00401501B652566", "E00401501B652567", "E00401501B652568" };            List<string> lstB = new List<string> { "E00401501B652563", "E00401501B652564", "E00401501B652565", "E00401501B652566", "E00401501B652567", "E00401501B652568", "E00401501B652569" };            List<string> newList = lstB.FindAll(x => !lstA.Contains(x));            foreach (var item in newList)            {                Console.WriteLine(item);            }            Console.ReadKey();

再看結果：

圖2

 看下加粗線 的代碼 和圖2結果，想必你看出所以然了。

把 A數組 當做 A區間 B數組 當做 B區間, B區間的 範圍大於 A區間 ，把A、B兩區間的 公用部分除掉，不同部分找出來。

1 結果 沒有資料輸出，原因就在此。

 3，在 A數組 在 加個 mac地址 這時候 A、B兩區間範圍一樣大

code:

            List<string> lstA = new List<string> { "E00401501B652562", "E00401501B652563", "E00401501B652564", "E00401501B652565", "E00401501B652566", "E00401501B652567", "E00401501B652568" };            List<string> lstB = new List<string> { "E00401501B652563", "E00401501B652564", "E00401501B652565", "E00401501B652566", "E00401501B652567", "E00401501B652568", "E00401501B652569" };            List<string> newList = lstB.FindAll(x => !lstA.Contains(x));            foreach (var item in newList)            {                Console.WriteLine(item);            }            Console.ReadKey();

再看結果：

圖3

 

圖3和圖2的結果一樣，不重複的資料 應該是 E00401501B652562,E00401501B652569這兩個mac地址才正確。

這時候代碼怎麼調整呢？看 4

 

4，Code

            List<string> lstA = new List<string> { "E00401501B652563", "E00401501B652562", "E00401501B652564", "E00401501B652565", "E00401501B652566", "E00401501B652567", "E00401501B652568" };            List<string> lstB = new List<string> { "E00401501B652563", "E00401501B652564", "E00401501B652565", "E00401501B652566", "E00401501B652567", "E00401501B652568", "E00401501B652569" };            List<string> listAll = new List<string>();            List<string> listResult = new List<string>();            var listUnionAll = lstA.Union(lstB).OrderBy(t => t);//排序合并資料                        foreach (var item in listUnionAll)            {                listAll.Add(item);            }            List<string> newList = listAll.FindAll(x => !lstA.Contains(x));//去重複，組合新的List集合            List<string> newList2 = listAll.FindAll(x => !lstB.Contains(x));            var Unionlist = newList.Union(newList2).OrderBy(t => t);//排序合并資料            foreach (var item in Unionlist)            {                Console.WriteLine(item);            }            Console.ReadKey();

 

結果

 

5，找重複資料 把linq不等號去掉就行了。

            List<string> lstA = new List<string> { "E00401501B652562", "E00401501B652563", "E00401501B652564", "E00401501B652565", "E00401501B652566", "E00401501B652567", "E00401501B652568" };            List<string> lstB = new List<string> { "E00401501B652563", "E00401501B652564", "E00401501B652565", "E00401501B652566", "E00401501B652567", "E00401501B652568", "E00401501B652569" };            List<string> newList = lstB.FindAll(x => lstA.Contains(x));            foreach (var item in newList)            {                Console.WriteLine(item);            }            Console.ReadKey();

結果

mac地址 62和69沒有輸出。

C# 兩個List泛型用 Linq去重複資料 或者 得到重複資料