Print all key-value pairs in a Dictionary in C#

This post will discuss how to print all key-value pairs in a dictionary in C#.

1. Using `foreach` loop

The idea is to iterate over the dictionary using a regular foreach loop and print all key-value pairs, as the following example illustrates.

using System;

using System.Collections.Generic;

public class Example

{

public static void Main()

{

Dictionary<string, int> dict = new Dictionary<string, int>() {

{"A", 1}, {"B", 2}, {"C", 3}, {"D", 4}

};

foreach (var kvp in dict) {

Console.WriteLine("Key = {0}, Value = {1}", kvp.Key, kvp.Value);

}

Download Run Code

Output:

Key = A, Value = 1
Key = B, Value = 2
Key = C, Value = 3
Key = D, Value = 4

2. Using `Enumerable.Select()` Method

If you need to just display key-value pairs present in the dictionary, you can get the string representation of the dictionary containing all key-value pairs. This transformation can be easily done using the LINQ’s Select() method. Note that you need to include System.Linq namespace.

using System;

using System.Linq;

using System.Collections.Generic;

public class Example

{

public static void Main()

{

Dictionary<string, int> dict = new Dictionary<string, int>() {

{"A", 1}, {"B", 2}, {"C", 3}, {"D", 4}

};

var str = String.Join(", ", dict.Select(kvp => "{" + kvp.Key + "=" +

kvp.Value.ToString() + "}"));

Console.WriteLine(str); // {A=1}, {B=2}, {C=3}, {D=4}

}

Download Run Code

Alternatively, you can convert each key-value pair into a string using the format specifier. For example,

using System;

using System.Linq;

using System.Collections.Generic;

public class Example

{

public static void Main()

{

Dictionary<string, int> dict = new Dictionary<string, int>() {

{"A", 1}, {"B", 2}, {"C", 3}, {"D", 4}, {"E", 5}

};

var str = String.Join(", ", dict.Select(kvp => string.Format("[{0}, {1}]",

kvp.Key, kvp.Value)));

Console.WriteLine(str); // [A, 1], [B, 2], [C, 3], [D, 4], [E, 5]

}

Download Run Code

That’s all about printing all key-value pairs in a dictionary in C#.

Print all key-value pairs in a Dictionary in C#

1. Using foreach loop

2. Using Enumerable.Select() Method

Share this:

1. Using `foreach` loop

2. Using `Enumerable.Select()` Method