Creating a read-only collection from an array in C#

The Array class has a number of interesting methods. One of them allows you to easily convert an array of T into a read-only collection of T:

string[] bands = new string[5] { "Queen", "ACDC", "Metallica", "Genesis", "INXS" };
IReadOnlyCollection<string> readOnlyBands = Array.AsReadOnly<string>(bands);

Note that readOnlyBands is, well, read-only, so there’s no Add or Remove method that otherwise are often available on lists.

View all various C# language feature related posts here.


About Andras Nemes
I'm a .NET/Java developer living and working in Stockholm, Sweden.

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