Multiple ways to Iterate Dictionary in C# Examples

Multiple ways to Iterate Dictionary in C# Examples

Dictionary is a data structure in C#, that stores key and value pairs. This tutorial explains multiple ways to iterate a dictionary object in C# Example

C# Iterate dictionary examples

There are multiple ways to iterate key and value pairs using forEach.

Iterate keys and values using foreach.

Each iteration holds an object of key and value pair, An object contains key and value pair

 foreach(var item in employees) {
      Console.WriteLine(item.Key + ": " + item.Value);

    }

You can also use KeyValuePair<> generics to hold key and value pair

//Iterate each object with KeyValuePair
foreach(KeyValuePair<int, string> item in employees){

        Console.WriteLine(item.Key+": "+item.Value);
}

Another way is to use destructing syntax, which works in .Net 4.7 version onwards.

foreach (var (key, value) in employees) {
        Console.WriteLine(key+": "+value);

}

Here is a complete example

using System;
using System.Collections.Generic;

public class Program {
  public static void Main() {
    Dictionary < int, string > employees = new Dictionary < int, string > ();
    employees.Add(1, "one");
    employees.Add(2, "four");
    employees.Add(3, "two");
    employees.Add(4, "three");
    // Iterate each object
    foreach(var item in employees) {
      Console.WriteLine(item.Key + ": " + item.Value);

    }
    //Iterate each object with KeyValuePair
    foreach(KeyValuePair<int, string> item in employees)
    {

        Console.WriteLine(item.Key+": "+item.Value);
    }

  }
}

use Dictionary.Values to iterate only values use Dictionary.Keys to iterate only keys.

Here is an example

// Iterate only Values
 foreach(var item in employees.Values) {
      Console.WriteLine(item);

}
// Iterate only Keys
foreach(var item in employees.Keys) {
      Console.WriteLine(item);

}