ContainsKey followed by Add (CA1864)
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Key dotnet.performance.containskey-then-add · Severity info · Category performance
Microsoft analyzer CA1864. Flags a ContainsKey guard before Dictionary.Add - TryAdd does both in one lookup.
Incorrect
Section titled “Incorrect”if (!totals.ContainsKey(sku)) totals.Add(sku, 0);Correct
Section titled “Correct”totals.TryAdd(sku, 0);