Convert Dictionary to a List in C#

This post will discuss how to convert a Dictionary<TKey,TValue> to a List<T> in C#.

The LINQ’s Select() method transforms each element of a sequence into a new form. The following code example demonstrates how we can use Select() to project over elements of a dictionary and get a list of its keys.

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}

};

List<string> keys = dict.Select(kvp => kvp.Key).ToList();

Console.WriteLine(String.Join(", ", keys)); // A, B, C, D, E

}

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To get a list of its values, use Dictionary<TKey,TValue>.Values property instead. You can skip using the Select() method using the following snippet:

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}

};

List<string> keys = dict.Keys.ToList();

Console.WriteLine(String.Join(", ", keys)); // A, B, C, D, E

}

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Alternatively, if you need a list of key-value pairs, you can directly invoke the ToList() method on your dictionary instance.

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}

};

List<KeyValuePair<string, int>> keys = dict.ToList();

Console.WriteLine(String.Join(", ", keys));

}

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Output:

[A, 1], [B, 2], [C, 3], [D, 4], [E, 5]

That’s all about converting Dictionary<TKey,TValue> to a List<T> in C#.

Convert Dictionary to a List in C#

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