Featured : February 18, 2025

The Curious Case of .NET ConcurrentDictionary and Closures

Photo by Chris Arthur-Collins

I was recently looking at the Duende Software codebase, and I kept seeing the same suggestion offered by the IDE tooling whenever I encountered a ConcurrentDictionary: “Closure can be eliminated: method has overload to avoid closure creation.”

While the suggestion appears in the tooling, there isn’t a quick fix action to apply the change. It left me scratching my head because there wasn’t an immediately obvious solution.

This post will define closures and explain their problems. We’ll also explain how to change your usage of ConcurrentDictionary to avoid closures altogether.

dotnet csharp

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