C#•2y ago

❔ ✅ C# lists

int[] arr = {1, 2, 3, 4, 5};
List<int> myList = new List<int>();

int[] arr = {1, 2, 3, 4, 5};
List<int> myList = new List<int>();

rather than using .Add() is there a way that i can put the array into myList in order to create the list from that

32 Replies

RonnieOP•2y ago

Angius•2y ago

arr.ToList() should also work, IIRC

RonnieOP•2y ago

thanks guys what is i wanted to loop through the list, would i use arr.length or myList.length? @implicit electron huh

 for (int i = 0; i < myList.length; i++)
 {
   Console.WriteLine(myList[i]);
 }

 for (int i = 0; i < myList.length; i++)
 {
   Console.WriteLine(myList[i]);
 }

Angius•2y ago

Or just foreach ¯\_(ツ)_/¯

MODiX•2y ago

Jester#8471

REPL Result: Success

List<int> myList = new() { 1, 2, 3, 4, 5 };
myList

List<int> myList = new() { 1, 2, 3, 4, 5 };
myList

Result: List<int>

[
  1,
  2,
  3,
  4,
  5
]

[
  1,
  2,
  3,
  4,
  5
]

Compile: 564.553ms | Execution: 34.230ms | React with ❌ to remove this embed.

Angius•2y ago

This does not create a list from an array

Jester•2y ago

you have a list without needing an array

RonnieOP•2y ago

the for loop i made looping through doesnt seem to work

Angius•2y ago

What doesn't work about it?

RonnieOP•2y ago

using System;
using System.Collections.Generic;

namespace CSharp
{
    class Program
    {

        public class myClass
        {
          public string colour = "Purple";
        }

        static void Main(string[] args)
        {                  
          myClass Obj = new myClass();
          Console.WriteLine(Obj.colour);


          int[] arr = {1, 2, 3, 4, 5};
          
          List<int> myList = new List<int>(arr);

          for (int i = 0; i < myList.Length; i++)
          {
            Console.WriteLine(myList[i]);
          }

        }
    }
}

using System;
using System.Collections.Generic;

namespace CSharp
{
    class Program
    {

        public class myClass
        {
          public string colour = "Purple";
        }

        static void Main(string[] args)
        {                  
          myClass Obj = new myClass();
          Console.WriteLine(Obj.colour);


          int[] arr = {1, 2, 3, 4, 5};
          
          List<int> myList = new List<int>(arr);

          for (int i = 0; i < myList.Length; i++)
          {
            Console.WriteLine(myList[i]);
          }

        }
    }
}

ignore the class

MODiX•2y ago

Angius#1586

REPL Result: Failure

          int[] arr = {1, 2, 3, 4, 5};
          
          List<int> myList = new List<int>(arr);

          for (int i = 0; i < myList.Length; i++)
          {
            Console.WriteLine(myList[i]);
          }

          int[] arr = {1, 2, 3, 4, 5};
          
          List<int> myList = new List<int>(arr);

          for (int i = 0; i < myList.Length; i++)
          {
            Console.WriteLine(myList[i]);
          }

Exception: CompilationErrorException

- 'List<int>' does not contain a definition for 'Length' and no accessible extension method 'Length' accepting a first argument of type 'List<int>' could be found (are you missing a using directive or an assembly reference?)

- 'List<int>' does not contain a definition for 'Length' and no accessible extension method 'Length' accepting a first argument of type 'List<int>' could be found (are you missing a using directive or an assembly reference?)

Compile: 661.372ms | Execution: 0.000ms | React with ❌ to remove this embed.

Angius•2y ago

.Count

MODiX•2y ago

Angius#1586

REPL Result: Success

          int[] arr = {1, 2, 3, 4, 5};
          
          List<int> myList = new List<int>(arr);

          for (int i = 0; i < myList.Count; i++)
          {
            Console.WriteLine(myList[i]);
          }

          int[] arr = {1, 2, 3, 4, 5};
          
          List<int> myList = new List<int>(arr);

          for (int i = 0; i < myList.Count; i++)
          {
            Console.WriteLine(myList[i]);
          }

Console Output

Compile: 641.923ms | Execution: 70.760ms | React with ❌ to remove this embed.

Angius•2y ago

Alternatively...

RonnieOP•2y ago

what is .cout .count*

Angius•2y ago

A property

PatrickG•2y ago

int[] arr = { 1, 2, 3 }; List<int> list = new List<int>(); list.AddRange(arr);

RonnieOP•2y ago

oh ok

MODiX•2y ago

Angius#1586

REPL Result: Success

int[] arr = {1, 2, 3, 4, 5};
List<int> myList = new List<int>(arr);

foreach (var element in myList)
{
Console.WriteLine(element);
}

int[] arr = {1, 2, 3, 4, 5};
List<int> myList = new List<int>(arr);

foreach (var element in myList)
{
Console.WriteLine(element);
}

Console Output

Compile: 607.012ms | Execution: 71.563ms | React with ❌ to remove this embed.

Angius•2y ago

Use a foreach and never worry about Count/Length again

RonnieOP•2y ago

ah that works too ok welp thanks everyone

Jester•2y ago

see he doesnt need an array but just a list

RonnieOP•2y ago

no i was converting the arr into a list then looping through

Jester•2y ago

you can also loop trough an array

RonnieOP•2y ago

im guessing that i shouldn't use lists unless i really need them huh

Jester•2y ago

yeah

RonnieOP•2y ago

ah ok

Jester•2y ago

each type has their use

Angius•2y ago

Lists are used when you need a dynamically-sized collection, so .Add(), .Remove(), etc

RonnieOP•2y ago

alright

MODiX•2y ago

Jester#8471

REPL Result: Success

int[] arr = {1, 2, 3, 4, 5};

foreach (var element in arr)
{
Console.WriteLine(element);
}

int[] arr = {1, 2, 3, 4, 5};

foreach (var element in arr)
{
Console.WriteLine(element);
}

Console Output

Compile: 595.764ms | Execution: 66.240ms | React with ❌ to remove this embed.

Accord•2y ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ ✅ C# lists