✅ Difference between `string[]` and `IEnumerable<string>`

in the following the code, the output seems to be the same:

using System;
using System.IO;

class Program
{
  public static void Main()
  {
    foreach (string dir in Directory.GetDirectories("Settings"))
      Console.WriteLine(dir);
    
    foreach (string dir in Directory.EnumerateDirectories("Settings"))
      Console.WriteLine(dir);
  }
}

using System;
using System.IO;

class Program
{
  public static void Main()
  {
    foreach (string dir in Directory.GetDirectories("Settings"))
      Console.WriteLine(dir);
    
    foreach (string dir in Directory.EnumerateDirectories("Settings"))
      Console.WriteLine(dir);
  }
}

i know that

enum

enum

s are used to define a set of exhaustive types, and are closely related to

int

int

s.
but what does it mean to have

IEnumerable<string>

IEnumerable<string>

and how different is it from

string[]

string[]

C#•16mo ago•

22 replies

tommy

✅ Difference between `string[]` and `IEnumerable<string>`

in the following the code, the output seems to be the same:

using System;
using System.IO;

class Program
{
  public static void Main()
  {
    foreach (string dir in Directory.GetDirectories("Settings"))
      Console.WriteLine(dir);
    
    foreach (string dir in Directory.EnumerateDirectories("Settings"))
      Console.WriteLine(dir);
  }
}

using System;
using System.IO;

class Program
{
  public static void Main()
  {
    foreach (string dir in Directory.GetDirectories("Settings"))
      Console.WriteLine(dir);
    
    foreach (string dir in Directory.EnumerateDirectories("Settings"))
      Console.WriteLine(dir);
  }
}

i know that

enum

enum

s are used to define a set of exhaustive types, and are closely related to

int

int

s.
but what does it mean to have

IEnumerable<string>

IEnumerable<string>

and how different is it from

string[]

string[]

✅ Difference between `string[]` and `IEnumerable<string>`

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