CODEWITHSUNDEEP
c#readonly-variable
DD995
DD995

Reputation: 11

Changing value of readonly array

I have this jagged array in C#:

    private static readonly float[][] Numbers = {
    new float[]{ 0.3f, 0.4f, 0.5}};

How can I override the value?

public static void SetNewNumbers(float[][] num){
    Numbers = num;}

This is not working because of readonly,what should be added? ( I cant change anything about Numbers)

Upvotes: 1

Views: 1330

Answers (2)

NetMage
NetMage

Reputation: 26907

You can reassign each value in Numbers assuming the new array matches:

void ResetNumbers(float[][] num) {
    if (num.Length != Numbers.Length || num[0].Length != Numbers[0].Length)
        throw new ArgumentException($"{nameof(num)} dimensions incorrect");

    for (int j1 = 0; j1 < Numbers.Length; ++j1) {
        for (int j2 = 0; j2 < Numbers[j1].Length; ++j2) {
            Numbers[j1][j2] = num[j1][j2];
        }
    }
}

Upvotes: 1

ΦXocę 웃 Пepe&#250;pa ツ
ΦXocę 웃 Пepe&#250;pa ツ

Reputation: 48258

here is the info you need:

In a field declaration, readonly indicates that assignment to the field can only occur as part of the declaration or in a constructor in the same class. A readonly field can be assigned and reassigned multiple times within the field declaration and constructor.

when you declare Numbers read only then this is not allowed

Numbers = num

coz you can not change the reference but you can modify the object...

so this is valid:

Numbers[0] = new[] {0.0f, 0.0f, 0.0f};
Numbers[0][1] = 1.0f;

Upvotes: 2

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