How Can I Efficiently Convert a System.Array to a List in C#?

Converting System.Array to List: A Practical Guide

Can System.Array be converted to List, a common question that has sparked both intrigue and debate over its feasibility? The answer, surprisingly, is a resounding yes.

To convert an array to a list, one might instinctively turn to OfType<>(). However, this approach is far from optimal, as demonstrated by the example below:

Array ints = Array.CreateInstance(typeof(int), 5);
ints.SetValue(10, 0);
ints.SetValue(20, 1);
ints.SetValue(10, 2);
ints.SetValue(34, 3);
ints.SetValue(113, 4);

// List<int> lst = ints.OfType<int>(); // Not recommended

Save yourself the headache and opt for the following solutions instead:

int[] ints = { 10, 20, 10, 34, 113 };

// Using ToList()
List<int> lst = ints.OfType<int>().ToList();

// Creating a new List
List<int> lst = new List<int> { 10, 20, 10, 34, 113 };

// Initializing and adding elements
List<int> lst = new List<int>();
lst.Add(10);
lst.Add(20);
lst.Add(10);
lst.Add(34);
lst.Add(113);

// Initializing with an array
List<int> lst = new List<int>(new int[] { 10, 20, 10, 34, 113 });

// Using AddRange()
var lst = new List<int>();
lst.AddRange(new int[] { 10, 20, 10, 34, 113 });

These methods provide more efficient and straightforward ways to convert from System.Array to List. Choose the approach that best suits your needs, and happy coding!

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