freeCodeCamp/guide/english/csharp/foreach/index.md

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Foreach Loop

Foreach Loop

The foreach loop executes a block of code for each item in a collection. The benefit of the foreach loop is you need not know how many items are within the collection to iterate through it; you simply tell your foreach loop to loop through the collection, as long as there are items within it. It is useful for iterating through lists, arrays, datatables, IEnumerables and other list-like data structures. It can be less efficient than a very well designed for loop, but the difference is negligible in most cases.

It is worth noting however, that when a foreach loop iterates through a data structure, each variable is read-only. Ideally, when you want to modify data in a loop, a for loop is the better choice.

Example

// syntax
foreach (element in iterable-item)
{
    // body of foreach loop
}

// sample code
List<string> Names = new List<string>{ "Jim", "Jane", "Jack" }

foreach(string name in Names)
{
    Console.WriteLine("We have " + name);    
}

Output:

> We have Jim
> We have Jane
> We have Jack