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The analyzer has detected that a collection element is being accessed using the '^' operator with a value less than or equal to 0. This results in an exception of the 'IndexOutOfRangeException' type.
Let's look at the following example:
T GetLastItem<T>(T[] array)
{
return array[^0];
}The '^' operator indicates that the index is counted from the end of the sequence. It may not be obvious that '^0' is equal to 'array.Length'. Attempting to get the last collection element via '^0' results in the exception, just like when using 'array[array.Length]'.
Here's the fixed code:
T GetLastItem<T>(T[] array)
{
return array[^1];
}This diagnostic is classified as:
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