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How do you pass an array of integers as an argument to a method in C#?

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Dani AI

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Brief clarification and a few practical notes that expand on the existing replies by , , , and .

As the thread shows, a method can accept an array parameter and callers can pass an array (and params lets callers pass separate values as well). Two important behaviors that are often missed: arrays are reference types, and a method receives the reference by value. Mutating elements inside the method changes the caller’s array; reassigning the parameter does not change the caller’s variable unless the parameter is ref or out.

void ReplaceWithZeros(ref int[] arr)
{
    arr = new int[arr.Length]; // caller's variable now refers to a new zero-filled array
}

For API design and safety, prefer interfaces over concrete arrays when appropriate. Use IEnumerable<int> if only iteration is needed, IReadOnlyList<int> when indexed read-only access is required, and ReadOnlySpan<int> for high-performance, allocation-free hot paths:

int Sum(IReadOnlyList<int> values)
{
    int s = 0;
    for (int i = 0; i < values.Count; i++) s += values[i];
    return s;
}

A few concise tips: always guard against null (or use Array.Empty<int>() as a default), remember params must be the last parameter, choose jagged (int[][]) vs rectangular (int[,]) arrays based on the data shape, and be mindful that sharing mutable arrays across threads requires synchronization. These points fill gaps in the short examples above and help avoid common bugs when passing arrays into methods.

Recommended Answers

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Member Avatar for Ramy Mahrous 
public void YourMethod([b]int[] arrOfInts[/b])
{
//your code goes here..
}
Member Avatar for aravindsp

How do you pass an array of integers as an argument to a method in C#?

void ShowNumbers (params int[] numbers)
{
    foreach (int x in numbers)
    {
        Console.Write (x+" ");
    }
    Console.WriteLine();
}

...

int[] x = {1, 2, 3};
ShowNumbers (x);
ShowNumbers (4, 5);
Edited by Nick Evan because: Keep It Organized - For easy readability, always wrap programming code within posts in [code] (code blocks)
Member Avatar for privatevoid

Note that the params keyword is not required unless you are going to add individual ints as multiple parameters to the method.

Member Avatar for hscoder

following example show how to pass array as arguement...seee this

private void ShowMessagebox(string[] arr)
            {
                string messageStr = "";
                for (int i = 0; i < arr.Length; i++)
                {
                    messageStr += arr[i] + " ";
                }
                MessageBox.Show(messageStr);
            }

for more information visit AuthorCode:

Edited by kvprajapati because: Added [code] tags.
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