This is the general availability release for the 3.9.0 version of the driver.
Important
Next minor release will raise the minimum supported MongoDB Server version from 4.2 to 4.4. This is in accordance with MongoDB Software Lifecycle Schedules. Support for MongoDB Server 4.2 will be dropped in a future release!
The main new features in 3.9.0 include:
- CSHARP-5567: Add a LINQ equivalent for $toHashedIndexKey
- CSHARP-4901: Add support for SearchMeta facet without operator
- CSHARP-5930: Allow registering the same encryption provider multiple times
- CSHARP-5899: Add support for "flat" indexing method in vector search index builders
- CSHARP-5931: Add builder support for $scoreFusion stage
Improvements:
- CSHARP-3556: Use EndPointServerSelector in SingleServerBinding instead of busy wait
- CSHARP-5611: Support ReadOnlySpan in ObjectId and eliminate the temporary byte array allocations
Fixes:
- CSHARP-5967: Ensure SerializerFinder proper support of Parse method
- CSHARP-5966: Add support of string.TrimStart and TrimEnd methods to SerializerFinder
- CSHARP-5942: Fix serializer resolution for dictionary paths with numeric string keys
- CSHARP-2868: Allow maxIdleTimeMS=0 and treat it as no idle time limit
- CSHARP-5762: Avoid changing "filter" to "parentFilter" in previously supported case
- CSHARP-5629: Respect BsonElement attribute in NamedIdMemberConvention
- CSHARP-6029: Execute endSessions on ServerSessionPool close
- CSHARP-6043: NullReferenceException in IEnumerableSerializerBase.Serialize when projecting nullable array with conditional Select
- CSHARP-6040: Fix StackOverflowException in convention CouldApply on self-referencing IEnumerable<T> types
Maintenance:
- CSHARP-6055: Update SharpCompress to remedy vulnerability
- CSHARP-6023: Update libmongocrypt URLs for 1.18.0+
- CSHARP-5943: Initial small AGENTS.md file for the C# driver
- CSHARP-5671: Replace Artifactory with ECR for container image pulls
The full list of issues resolved in this release is available at CSHARP JIRA project.
Documentation on the .NET driver can be found here.