IsNullOrEmpty equivalent for Array? C#

Question

Is there a function in the .NET library that will return true or false as to whether an array is null or empty? (Similar to string.IsNullOrEmpty).

I had

Answer 1

if (array?.Any() != true) { ... }

• Don't forget having using System.Linq;
• Note one must explicitly compare against true since the underlying type is bool?

Answer 2

Checking for null or empty or Length has been simplified with C# Linq. With null coalesce operator, one can simply do this:

if (array?.Any())
    return true;
else return false;

Answer 3

You can also use Any on creating your extension method:

public static bool IsNullOrEmpty<T>(this T[] array) where T : class
    {
        return (array == null || !array.Any());
    }

Don't forget to add using System.Linq; on your using statements.

Answer 4

This is an updated C# 8 version of the (currently) up-voted answer

public static bool IsNullOrEmpty<T>([NotNullWhen(false)] this T[]? array) =>
    array == null || array.Length == 0;

Answer 5

In case you initialized you array like

string[] myEmpytArray = new string[4];

Then to check if your array elements are empty use

myEmpytArray .All(item => item == null)

Try

 public static bool IsNullOrEmpty<T> (this ICollection<T> collection)
 {
    if (collection == null || collection.Count == 0)
        return true;
    else
       return collection.All(item => item == null);
 }