How do I concatenate two arrays in C#?

Question

How do I concatenate two arrays in C#?

int[] x = new int [] { 1, 2, 3};

int[] y = new int [] { 4, 5 };



int[] z = // your answer here...



Debug.Assert(z.SequenceEqual(new int[] { 1, 2, 3, 4, 5 }));

Right now I use

int[] z = x.Concat(y).ToArray();

Is there an easier or more efficient method?

cpp net array

4 years ago by Bharatgxwzm

2 Answers

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**vishaljlf39** · Answer 1 · 2021-08-07T10:53:19

vishaljlf39

You should try this

var z = new int[x.Length + y.Length];

x.CopyTo(z, 0);

y.CopyTo(z, x.Length);

4 years ago

**pankajshivnani123** · Answer 2 · 2021-08-09T12:44:01

You could write an extension method:

public static T[] Concat<T>(this T[] x, T[] y)

{

    if (x == null) throw new ArgumentNullException("x");

    if (y == null) throw new ArgumentNullException("y");

    int oldLen = x.Length;

    Array.Resize<T>(ref x, x.Length + y.Length);

    Array.Copy(y, 0, x, oldLen, y.Length);

    return x;

}

Then:

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

int[] z = x.Concat(y); // {1,2,3,4,5}

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How do I concatenate two arrays in C#?

2 Answers

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