EmptyArrayCreation

Summary

Use System.Array.Empty<T>() instead of an empty array creation.

Default severity

Warning

Description

An empty array is immutable, so it can be shared safely with all threads. And creating empty arrays many times is ineffective because your CPU spends more time for Garbage Collection. So the empty array object must be created only once and be shared.

Code fix

The code fix provides an option replacing the empty array creation with System.Array.Empty<T>().

Example

Diagnostic

public string[] EmptyStringArray { get; }
    = new string[0];

public int[] Method()
{
    var emptyIntegers = new int[] {};
    ⋮

Code fix

public string[] EmptyStringArray { get; }
    = System.Array.Empty<string>();

public int[] Method()
{
    var emptyIntegers = System.Array.Empty<int>();
    ⋮