Steven Giesel • 11/20/2022

How to get allocations in .NET? And how big is an empty array?

This technical article demonstrates how to use GC.GetAllocatedBytesForCurrentThread() to measure heap allocations in .NET. It answers the question of why an empty array (like new int[0]) allocates 24 bytes, detailing the object header and method table overhead. It also covers best practices like using Array.Empty<T>() to avoid repeated allocations and briefly explains GC.TryStartNoGCRegion for controlling garbage collector behavior during performance-critical code.

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#performance #c #array