.NET: Fix filter combine logic for ChatHistoryMemoryProvider#4501
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westey-m merged 4 commits intoMar 6, 2026
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Pull request overview
Fixes a bug in ChatHistoryMemoryProvider where combining multiple scope filters (ApplicationId/AgentId/UserId/SessionId) could produce an invalid expression tree due to mismatched ParameterExpression instances, breaking compilation/translation in some vector store connectors.
Changes:
- Reworked filter construction to use a single shared
ParameterExpression, rebinding each filter body before combining withExpression.AndAlso. - Added a unit test that captures the generated filter and verifies it can be compiled and executed when multiple scope fields are set.
Reviewed changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.
| File | Description |
|---|---|
| dotnet/src/Microsoft.Agents.AI/Memory/ChatHistoryMemoryProvider.cs | Builds combined scope filters using a shared parameter and introduces a small expression visitor to rebind parameters safely. |
| dotnet/tests/Microsoft.Agents.AI.UnitTests/Memory/ChatHistoryMemoryProviderTests.cs | Adds a regression test ensuring combined filters are compilable/executable when multiple scope filters are present. |
peibekwe
reviewed
Mar 5, 2026
peibekwe
approved these changes
Mar 5, 2026
Address PR review nit: use explicit types instead of var for better readability in the filter-building logic and the new combined filter compilation test. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
SergeyMenshykh
approved these changes
Mar 6, 2026
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Motivation and Context
Fixes #4459
Description
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