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csharp

System.IndexOutOfRangeException: Index was outside the boun…

Error message

System.IndexOutOfRangeException: Index was outside the bounds of the array.

What broke

The code tried to access an element of an array using an index that is either negative or greater than or equal to the length of the array. This results in an 'IndexOutOfRangeException'.

Why it broke

This error occurs because arrays in programming have fixed sizes, and accessing an index outside this range is not allowed. The root cause is likely due to incorrect calculations or assumptions about the array's size.

How to fix

To fix this, ensure that any index used to access the array is within the valid range, which is from 0 to the length of the array minus one. You can add checks before accessing the array to prevent this error.

Code fix

if (index >= 0 && index < array.Length) { var value = array[index]; }

Explained by ErrorOracle

Prevention tip

You can add checks before accessing the array to prevent this error.

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