The .NET Base Class Library's Dictionary<TKey, TValue> offers constant time access to values, but duplicated lookups can reduce efficiency. Utilizing the TryAdd method in .NET Core 2.0 can prevent duplicate lookups and boost performance. Additionally, .NET 6 introduced methods in System.Runtime.InteropServices.CollectionsMarshal to address duplicate lookup scenarios using managed pointers. These methods, alongside managed pointers and the ref keyword, can significantly speed up dictionary operations, particularly with structs and large structures. However, it's crucial to handle managed pointers cautiously to avoid potential issues with dictionary reorganization.
Table of contents
Avoiding duplicate lookupAccessing dictionary internal layout with managed pointersScenario 1: Creating the value only if the key is not present in the dictionaryScenario 2: Modifying structs value in dictionaryScenario 3: Large Structs value in dictionaryCaution when using managed pointers on a dictionaryConclusion4 Comments
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