Several Methods to resize an array

Suppose there is an array with a specified length. How can we resize it? The easiest way to scale up is as follows:

    class Program
    {
        static void Main(string[] args)
        {
            int[] arrs = new[] {1, 2, 3, 4, 5};
            arrs[5] = 6;
        }
    }

Error: indexoutofranageexception is not processed, and the index exceeds the array limit.

 

□Create a temporary expanded array and assign it to the original array.

        static void Main(string[] args)
        {
            int[] arrs = new[] {1, 2, 3, 4, 5};
            int[] temp = new int[arrs.Length + 1];
// Traverse the arrs array and assign all elements of the array to the temp Array
            for (int i = 0; i < arrs.Length; i++)
            {
                temp[i] = arrs[i];
            }
// Assign a temporary array to the original array, and the original array has been expanded.
            arrs = temp;
// Assign a value to the last position of the original array after expansion
            arrs[arrs.Length - 1] = 6;
            foreach (var item in arrs)
            {
                Console.WriteLine(item);
            }
            Console.ReadKey();
        }

 

□Create a temporary array for expansion, assign a value to the original array, and use the static method of Array

For normal copying between arrays, the array class must have prepared a static method: array. Copy ().

        static void Main(string[] args)
        {
            int[] arrs = new[] {1, 2, 3, 4, 5};
            int[] temp = new int[arrs.Length + 1];
            Array.Copy(arrs, temp, arrs.Length);
// Assign a temporary array to the original array, and the original array has been expanded.
            arrs = temp;
// Assign a value to the last position of the original array after expansion
            arrs[arrs.Length - 1] = 6;
            foreach (var item in arrs)
            {
                Console.WriteLine(item);
            }
            Console.ReadKey();
        }

□Use the static method of array to resize

However, copying and copying are cumbersome. We can also use the array. Resize () method to resize the array.

        static void Main(string[] args)
        {
            int[] arrs = new[] {1, 2, 3, 4, 5};
            Array.Resize(ref arrs, arrs.Length + 1);
// Assign a value to the last position of the original array after expansion
            arrs[arrs.Length - 1] = 6;
            foreach (var item in arrs)
            {
                Console.WriteLine(item);
            }
            Console.ReadKey();
        }

 

Summary: array expansion gives priority to the use of the static method of array resize, and secondly, to assign a temporary and expanded array to the original array.

Several Methods to resize an array