This is the general availability release for the 3.5.0 version of the driver.
Important
Internal Changes for an Upcoming Feature
This release includes low level changes to internal subsystems including operation execution, timeout handling, and resource cleanup logic - in preparation for supporting Client-Side Operations Timeout (CSOT) in an upcoming release.
While these changes should be backward-compatible and not alter existing behavior, they touch core driver infrastructure.
If you experience unexpected issues such as:
- Operations timing out unexpectedly or not timing out when expected
- Unusual delays or hangs in database calls
- Differences in command cancellation behavior
Please let us know via the MongoDB JIRA Driver project or your MongoDB support channel, providing driver logs and a reproduction if possible.
Experimental Support for Queryable Encryption Text Field Prefix, Suffix and Substring Queries
Substring, prefix and suffix search for Queryable Encryption are in preview and should be used for experimental workloads only. These features are unstable and their security is not guaranteed until released as Generally Available (GA). The GA version of these features may not be backwards compatible with the preview version.
The main new features in 3.5.0 include:
- CSHARP-5453: Add builder for CSFLE schemas
- CSHARP-3222: Add LINQ support for median and percentile accumulators/window functions
- CSHARP-5672: Support sorting by value in PushEach operation
- CSHARP-5625: Support text indexes for explicit and automatic encryption
- CSHARP-734: SOCKS5 Proxy Support
- CSHARP-3458: Extend IAsyncCursor and IAsyncCursorSource to support IAsyncEnumerable
Improvements:
- CSHARP-5603: Add Big Endian support in BinaryVectorReader and BinaryVectorWriter
- CSHARP-5614: Fix deserialization of primitive arrays on Big Endian systems
- CSHARP-5619: Replace IConnection.SendMessages with the method to send a single message
- CSHARP-5377: Eliminate unnecessary killCursors command when batchSize == limit
Fixes:
- CSHARP-3435: FilterDefinition Inject method should use root serializer
- CSHARP-3662: MongoClientSettings.SocketTimeout does not work for values under 500ms on Windows for sync code
- CSHARP-4040: Fix bug when using field with same element name as discriminator
- CSHARP-5587: FindOneAndUpdate should insert correct discriminator value on upsert
- CSHARP-3494: Fix discriminator for generic types
- CSHARP-5588: Unable to select KeyValuePair Key when using camelCase convention
- CSHARP-5633: BsonSerializer.IsTypeDiscriminated is not thread-safe
Maintenance:
- CSHARP-5596: Remove unused *OpcodeOperation classes
- CSHARP-5617: Remove unused IChannel.Query methods
- CSHARP-5547: Remove support for MongoDB 4.0
The full list of issues resolved in this release is available at CSHARP JIRA project.
Documentation on the .NET driver can be found here.