C# 兩個List泛型用lamada表達式去重復數據 或者 得到重復數據

1, 兩個List泛型用lamada表達式去重復數據

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 為什么會出現這個情況，什么都沒有輸出。下面修改下程序，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 范圍大於 A區間 ，把A、B兩區間的 公共部分除掉，不同部分找出來。

1 結果 沒有數據輸出，原因就在此。

 3，在 A數組 在 加個 mac地址 這時候 A、B兩區間范圍一樣大

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，不重復的數據 應該是 E00401501B652562,E00401501B652569這兩個mac地址才正確。

這時候代碼怎么調整呢？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);//排序合並數據
            
            foreach (var item in listUnionAll)
            {
                listAll.Add(item);
            }

            List<string> newList = listAll.FindAll(x => !lstA.Contains(x));//去重復，組合新的List集合
            List<string> newList2 = listAll.FindAll(x => !lstB.Contains(x));

            var Unionlist = newList.Union(newList2).OrderBy(t => t);//排序合並數據

            foreach (var item in Unionlist)
            {
                Console.WriteLine(item);
            }
            Console.ReadKey();

 

結果

 

5，找重復數據 把lamada表達式不等於號去掉就行了。

            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。