Use Builder in ImmutableDictionary.SetItems extension#12402
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AR-May merged 4 commits intodotnet:mainfrom Oct 1, 2025
Merged
Use Builder in ImmutableDictionary.SetItems extension#12402AR-May merged 4 commits intodotnet:mainfrom
AR-May merged 4 commits intodotnet:mainfrom
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Pull Request Overview
This change optimizes memory allocation in the SetItems extension method for ImmutableDictionary<string, string> by using ImmutableDictionary.Builder instead of a generator-based approach. The modification eliminates the intermediate enumerable allocation while maintaining the same validation logic and null-to-empty-string conversion behavior.
Key Changes
- Replaced
ValidateItemsgenerator method with directBuilderoperations - Eliminated intermediate enumerable allocation, saving ~34MB according to profiling data
- Maintained identical functionality for key validation and null value handling
ccastanedaucf
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AR-May
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Sep 22, 2025
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Looks good to me. I will make exp insertion and look at numbers.
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Ok, exp insertion came up showing improvements. merging the PR. |
This was referenced Feb 23, 2026
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Context
Small change to avoid allocating a generated enumerable. Using a
Builderhere is otherwise identical in perf toSetItems, as both hit the same paths to allocate a new instance + modified subtree nodes. ~34MB diff below.Before
After
