Console App Task 09: How to check is empty string[] folders in C#

Console App Task 09: How to check is empty string[] folders in C# ? 

To check if a string[] folders array is empty or null, you can use the following approaches:

Method 1: Check for null or Empty Length

if (folders == null || folders.Length == 0)
{
    Console.WriteLine("The folders array is empty or null.");
}

✅ Best Practice: This checks if folders is null or has no elements.

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Method 2: Check for Empty Strings Inside the Array

If you need to check whether the array contains only empty or whitespace strings, use LINQ:

using System;
using System.Linq;

if (folders == null || folders.All(string.IsNullOrWhiteSpace))
{
    Console.WriteLine("The folders array is empty or contains only empty values.");
}

✅ Fix: string.IsNullOrWhiteSpace() ensures that empty ("") and whitespace (" ") strings are also counted as empty.

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Example Usage

using System;
using System.Linq;

class Program
{
    static void Main()
    {
        string[] folders = {}; // Empty array

        if (folders == null || folders.Length == 0)
        {
            Console.WriteLine("folders array is empty or null.");
        }

        if (folders.All(string.IsNullOrWhiteSpace))
        {
            Console.WriteLine("folders array contains only empty or whitespace values.");
        }
    }
}

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Conditions and checks:

Condition	Checks
folders == null	If the array itself is null.
folders.Length == 0	If the array has no elements.
folders.All(string.IsNullOrWhiteSpace)	If all elements are empty ("") or whitespace (" ").

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