How is the KeyValuePair used in C#?

10 months ago

Noah Thompson

2 minutes

KeyValuePair in C# is a generic structure used for storing key-value pairs. It associates a key with a value, allowing for simultaneous access to both. KeyValuePair is commonly used to store data in dictionaries or collections.

Here is an example demonstrating how to use KeyValuePair:

using System;
using System.Collections.Generic;

class Program
{
    static void Main()
    {
        // 创建一个KeyValuePair
        KeyValuePair<int, string> pair = new KeyValuePair<int, string>(1, "apple");

        // 访问键和值
        Console.WriteLine($"Key: {pair.Key}, Value: {pair.Value}");

        // 在字典中使用KeyValuePair
        Dictionary<int, string> dict = new Dictionary<int, string>();
        dict.Add(pair.Key, pair.Value);

        foreach (KeyValuePair<int, string> kvp in dict)
        {
            Console.WriteLine($"Key: {kvp.Key}, Value: {kvp.Value}");
        }
    }
}

In the example above, we start by creating a KeyValuePair object and then accessing its key and value. Next, we add the KeyValuePair object to a dictionary and iterate through all KeyValuePairs in the dictionary using a foreach loop. KeyValuePair offers a convenient way to handle key-value pair data.