[C#] C#: "The assignment to a constant array must be a constant"

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Hello everyone, I am a Buddhist engineer ☆Tranquil Little Demon Dragon☆ . I update Unity development skills from time to time. If you think it is useful, remember to click three times.

I. Introduction

Record an interesting code snippet.

First, a review of constants.

Because this article is not intended to specifically explain constants, let’s briefly introduce constants:

Constant composition:

A constant in C# is composed of three parts, the decibel is const, data type, and variable name.

1. const: It is a keyword used to define constants in C# and cannot be ignored.
2. Data type: Specify a type of data, such as integer, string, etc.
3. Variable name: custom naming.

for example:

const int sum = 0;

What is a constant
Constant means that its value will not change during the running of the program. The only difference between a constant and a variable is that the value of a constant cannot be changed, while the value of a variable can be changed.

Why use a constant
Since the value of a constant cannot be changed during the running of the program, it can be used to store some fixed values, such as pi, discount rate, etc.

for example:

const float PI = 3.14159265358979F;

So, when the blogger wrote the code, he thought, can we define a constant array, and store constants in it. . .

Two, the text

So with this code:

using UnityEngine;

public class Test01 : MonoBehaviour
{
    
    
    const int[] sumAry = new int[1] {
    
     1 };

    void Start()
    {
    
    
        
    }
}

But writing this way, an error is reported, which is a very serious error that cannot be compiled:
insert image description here
this is because constthe keyword is used to compile known values, but the array will not be initialized at compile time, so the value of the array is not known at compile time, so It's pointless to write this way.

However, keywords can be used readonlyto achieve the same effect without error.

readonlyreadonlyKeywords are used to specify that the value of a variable cannot be modified after initialization. The following code example shows us how to use keywords in C# :

using System.Runtime.CompilerServices;
using UnityEngine;

public class Test01 : MonoBehaviour
{
    
    
    public static readonly string[] Values = {
    
     "Value1", "Value2", "Value3", "Value4" };

    void Start()
    {
    
    
        Debug.Log(Values[0]);
    }
}

3. Postscript

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