Question

How to convert ArrayList to List in C#

Answer 1

using System;
using System.Collections;
using System.Collections.Generic;
 
static class LST {
    public static List<T> ToList<T>(this ArrayList al) {
        List<T> list = new List<T>(al.Count);
        
        foreach (T n in al) {
            list.Add(n);
        }
        return list;
    }
}
 
class Program {
    static void Main() {
        ArrayList arrayList = new ArrayList(){"c++", "c#", "c", "java"};
 
        List<string> list = arrayList.ToList<string>();
         
        foreach (string n in list) {
            Console.WriteLine(n);
        }
    }
}
 
 
 
 
/*
run:
 
c++
c#
c
java
 
*/

 

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Answer 2

using System;
using System.Collections;
using System.Collections.Generic;
 
static class LST {
    public static List<T> ToList<T>(this ArrayList al) {
        List<T> list = new List<T>(al.Count);
        
        foreach (T n in al) {
            list.Add(n);
        }
        return list;
    }
}
 
class Program {
    static void Main() {
        ArrayList arrayList = new ArrayList(){4, 1, 9, 5};
 
        List<int> list = arrayList.ToList<int>();
         
        foreach (int n in list) {
            Console.WriteLine(n);
        }
    }
}
 
 
 
 
/*
run:
 
4
1
9
5
 
*/

 

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