地從一個ArrayList中的元素到另一個ArrayList中的ASP.NET

Question

我有兩個數組列表

public ArrayList myA = new ArrayList(); 
public ArrayList myB = new ArrayList(); 

當談到在myA一個新值，刪除myB舊的內容，從myA舊的內容移動到myB和myA有新的價值

例如：

myA("value1","value2","value3"); 
myB("","",""); 

來的新值：

myA("value4","value5","value6"); 
myB("value1","value2","value3"); 

來吧另一個值：

myA("value7","value8","value9"); 
myB("value4","value5","value6"); 

請幫我

Answer 1

如果我的理解是否正確這應該做的工作

// Initial values 
     ArrayList myA = new ArrayList() { "value1", "value2", "value3" }; 
     ArrayList myB = new ArrayList() { "", "", "" }; 

     // New values 
     ArrayList myC = new ArrayList() { "value4", "value5", "value6" }; 

     // Clear the old values from myB and add the old values of myA to myB 
     myB.Clear(); 
     myB.AddRange(myA); 

     // Clear the old values from mya and add the new values to myA 
     myA.Clear(); 
     myA.AddRange(myC); 

Answer 2

using System.IO; 
using System; 
using System.Collections.Generic; 

public class ArrayWithBackup : List<String> 
{ 
    List<String> arrayWithBackup; 
    List<String> backupArray; 
    public ArrayWithBackup() 
    { 
     arrayWithBackup = new List<string>(); 
    } 

    public void AddStrings(List<String> inputs) 
    { 
     if (backupArray != null && backupArray.Count > 0) 
      backupArray.Clear(); 

     backupArray = new List<string>(arrayWithBackup); 
     arrayWithBackup.Clear(); 
     for (int i = 0; i < inputs.Count; ++i) 
     { 
      arrayWithBackup.Add(inputs[i]); 
     } 
    } 

    public void PrintArray() 
    { 
     Console.WriteLine("Array contains:"); 
     for(int i = 0; i < arrayWithBackup.Count; ++i) 
      Console.WriteLine("Index {0}: {1}", i, arrayWithBackup[i]); 
    } 

    public void PrintBackupArray() 
    { 
     Console.WriteLine("BackupArray contains:"); 
     for (int i = 0; i < backupArray.Count; ++i) 
      Console.WriteLine("Index {0}: {1}", i, backupArray[i]); 
    } 

    public List<String> GetArray() 
    { 
     return arrayWithBackup; 
    } 

    public List<String> GetBackupArray() 
    { 
     return backupArray; 
    } 
} 

public class Test 
{ 
    static void Main(string[] args) 
    { 
     ArrayWithBackup awb = new ArrayWithBackup(); 

     List<String> inputs = new List<String>(); 
     inputs.Add("one"); 
     inputs.Add("two"); 
     inputs.Add("three"); 

     awb.AddStrings(inputs); 
     inputs.Clear(); 

     inputs.Add("four"); 
     inputs.Add("five"); 
     inputs.Add("six"); 
     awb.AddStrings(inputs); 

     awb.PrintArray(); 
     awb.PrintBackupArray(); 
    } 
} 

//Output: 
//Array contains: 
//Index 0: four 
//Index 1: five 
//Index 2: six 

//BackupArray contains: 
//Index 0: one 
//Index 1: two 
//Index 2: three