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How to efficiently copy entire array or its part?

C#  |  .NET

If you want to efficiently copy the whole array, you can use the following code:

byte[] source = [1, 2, 3, 4, 5, 6, 7, 8];
byte[] target = new byte[source.Length];
Array.Copy(source, target, source.Length);

Copying a part of an array is supported as well, as you can see below:

byte[] source = [1, 2, 3, 4, 5, 6, 7, 8];
byte[] target = new byte[4];
Array.Copy(source, 2, target, 0, 4);

The following parameters of the Copy static method indicate:

  • the source array (source),
  • a starting index of the source array (2),
  • the target array (target),
  • a starting index of the target array (0),
  • the length (4).

So, the code above copies 4 elements from the source array, starting from index 2, and places them in target array, starting from index 0. Then, the target array contains the elements: [3, 4, 5, 6].

If you want to learn much more about arrays, as well as about other data structures, I encourage you to take a look at my book, namely the Second Edition of C# Data Structures and Algorithms, published by Packt Publishing in 2024. You can buy it here.

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Hello, I am Marcin

Reliable entrepreneur with 10+ years of companies operation, such as CEO at a few IT companies. I was an author of a few software & hardware products, still open to new ideas & cooperation.

Helpful expert with 10+ years of experience, together with PhD and DSc in Computer Science. I was an author of books and publications, as well as an expert in international projects.

Experienced developer with 10+ years of development and 100+ completed projects. I worked on various complex international projects, e.g. at Microsoft in USA and as CTO at a few companies. I have MCP, MCTS and MCPD certificates.

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I am an author of a few books and numerous publications, also in high-quality international scientific journals.

If you want to learn data structures and algorithms in the context of C#, let's take a look at my newest book. It is the second edition of C# Data Structures and Algorithms. You can buy it here.


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