How Do I Efficiently Add Values to a C# Array?

Add value to array in C#

In C#, adding values ​​to an array is a very common operation. Let’s explore a few ways to do this.

The provided code snippet demonstrates an attempt to add a value to an array using the terms[] = runs syntax. However, this doesn't work because in C# you need to specify the array size when creating the array.

Solution:

To add values ​​to an array, you first need to create an array of a specified size. This can be done using the new keyword:

<code class="language-csharp">int[] terms = new int[400];</code>

After creating an array, you can use the array index to assign values ​​to its elements:

<code class="language-csharp">for (int runs = 0; runs < 400; runs++)
{
    terms[runs] = runs;
}</code>

Alternatively, use a list:

If you are not sure about the size of the array, you can use List<int> instead. Lists are dynamic arrays that can grow and shrink as needed:

<code class="language-csharp">List<int> termsList = new List<int>();
for (int runs = 0; runs < 400; runs++)
{
    termsList.Add(runs);
}</code>

If you need to convert the list back to an array, you can use the ToArray() method:

<code class="language-csharp">int[] terms = termsList.ToArray();</code>

Performance Notes:

It is worth noting the performance impact of using different methods. The for loop on List<T> is about twice as fast as the foreach loop on List<T>. Additionally, looping over an array is about twice as fast as looping over List<T>. Therefore, consider optimizing with performance in mind when writing your code.

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