CODEWITHSUNDEEP
c#.netarrayspersistencereadonly
Giffyguy
Giffyguy

Reputation: 21292

How can I declare a non-writable array in C#?

Currently, my code resembles this:

private static readonly int[] INTARRAY = {1, 2, 3};

This prevents me from assigning to INTARRAY to a new instance of int[] outside of the static constructor, but it still allows me to assign to the individual int elements.
For example:

INTARRAY[1] = 5;

How can I make this array completely read-only? This is an array of value-types, and is assigned with an array initializer in the declaration. How can I make these initial values persist indefinitely?

Upvotes: 3

Views: 268

Answers (3)

steinar
steinar

Reputation: 9653

If you're absolutely set on using an array, you could write a simple wrapper class around the array with a read-only indexer accessing the elements.

Upvotes: 1

Ali Tarhini
Ali Tarhini

Reputation: 5358

unfortunately, there is no builtin c# construct that provides this feature for arrays. Best solution is to use a List instead if it conforms with your business needs

Upvotes: 1

Joe White
Joe White

Reputation: 97676

If it's an array, you can't. But if you're willing for it to be an IList<int>, you can do:

private static readonly IList<int> INTARRAY = new List<int> {1, 2, 3}.AsReadOnly();

Upvotes: 9

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