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How to update the value stored in a Dictionary in C#?
In C#, Dictionary is a generic collection which is generally used to store key/value pairs. In Dictionary, the key cannot be null, but value can be. A key must be unique. Duplicate keys are not allowed if we try to use duplicate key then compiler will throw an exception.
As mentioned above a value in a dictionary can be updated by using its key as the key is unique for every value.
myDictionary[myKey] = myNewValue;
Example
Let’s take a dictionary of students having id and name. Now if we want to change the name of the student having id 2 from "Mrk" to "Mark".
using System;
using System.Collections.Generic;
namespace DemoApplication{
class Program{
static void Main(string[] args){
Dictionary<int, string> students = new Dictionary<int, string>{
{ 1, "John" },
{ 2, "Mrk" },
{ 3, "Bill" }
};
Console.WriteLine($"Name of student having id 2: {students[2]}");
students[2] = "Mark";
Console.WriteLine($"Updated Name of student having id 2: {students[2]}");
Console.ReadLine();
}
}
}Output
The output of the above code is −
Name of student having id 2: Mrk Updated Name of student having id 2: Mark
Updated on: 04-Aug-2020
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