---
title: Ditto v4 for C#
slug: v4-4/vkVS7XL06518anD2yK2fw
docTags:
createdAt: 2023-08-22T19:03:01.945Z
---
`csharp` `c#` `c sharp` `updates` `version` `changelog`
***
### C# Version 4.5.0
:::Changelog{title="Released: Fri Nov 17, 2023"}
::ChangelogItem{type="added" description="Support for .NET MAUI. (#5794)"}
::ChangelogItem{type="added" description="Support for Xamarin Android.. (#5082)"}
::ChangelogItem{type="added" description="Support for Xamarin iOS Simulators. (#6081)"}
::ChangelogItem{type="added" description="`Ditto.Version` static property providing access to the semantic version of the SDK. (#10223)"}
::ChangelogItem{type="added" description="Class `DittoQueryResultItem` representing a single match of a DQL query. (#10319, 10394)"}
::ChangelogItem{type="added" description="Class `DittoQueryResult` representing the result of executing a DQL query. (#10319, #10394)"}
::ChangelogItem{type="added" description="Method `ExecuteAsync()` on `DittoStore` that executes a DQL query and returns a `DittoQueryResult` containing `DittoQueryResultItem`s for each match. (#10319, #10394)"}
::ChangelogItem{type="added" description="Class `DittoSyncSubscription` that configures Ditto to receive updates from remote peers about documents matching the subscription's query. It's a DQL counterpart and successor to the old `Subscription` class. (#10395, #10394)"}
::ChangelogItem{type="added" description="Method `RegisterSubscription()` on `DittoSync` that installs and returns a `SyncSubscription`. (#10395, #10394)"}
::ChangelogItem{type="added" description="Property `Subscriptions` on `DittoSync` providing access to all currently active sync subscriptions. (#10395, #10394)"}
::ChangelogItem{type="added" description="Property `Sync` on `Ditto` of type `DittoSync` to serve as an entry point for sync functionality. (#10395, #10394)"}
::ChangelogItem{type="added" description="Class `DittoStoreObserver` on `DittoStore` that configures Ditto to invoke an observation handler whenever results for its query change. (#10396, #10394)"}
::ChangelogItem{type="added" description="Method `RegisterObserver()` on `DittoStore` that installs and returns a `DittoStoreObserver`. (#10396, #10394)"}
::ChangelogItem{type="added" description="Property `Observers` on `DittoStore` providing access to all currently active store observers. (#10396, #10394)"}
::ChangelogItem{type="added" description="The `SmallPeerInfo` property to Ditto allowing you to configure the collection and sync of Small Peer Info. (#10517)"}
::ChangelogItem{type="improved" description="Deprecated: `DittoLanConfig.MulticastEnabled` property. (#10126)"}
::ChangelogItem{type="improved" description="Changed: Ditto .NET SDK for iOS and macOS is built and tested with Xcode 14.3.1. (#10177)"}
::ChangelogItem{type="fixed" description="Bluetooth and LAN transports fail to stop on Windows and Linux. (#8809)"}
::ChangelogItem{type="improved" description="Performance by implementing bipartite distance-aware mesh topology. (#10632)"}
::ChangelogItem{type="improved" description="Memory usage and performance of Documents. (#10736)"}
::ChangelogItem{type="improved" description="Reduced metadata accumulation after eviction by clearing remote summaries. (#7065)"}
::ChangelogItem{type="improved" description="Serialization performance. (#9112)"}
::ChangelogItem{type="fixed" description="Made logging more robust to failed writes in a specific set of circumstances. (#10077)"}
::ChangelogItem{type="fixed" description="Addressed a warning from SQLite that sometimes occurs on startup about a schema change. (#10501)"}
::ChangelogItem{type="fixed" description="Presence graph may not show all active connections. (#10507)"}
::ChangelogItem{type="fixed" description="When observing peers, isConnectedToDittoCloud property may be incorrect. (#10534)"}
::ChangelogItem{type="fixed" description="Initial logging events now use the same format as all other logs. (#10611)"}
::ChangelogItem{type="fixed" description="Mesh could choose random connections. (#10711)"}
::ChangelogItem{type="fixed" description="-A bug with Ditto's internal crash handler. (#10022)"}
:::
### C# Version 4.4.5
:::Changelog{title="Released: Fri Nov 17, 2023"}
::ChangelogItem{type="added" description="SDK version/language/platform and device name are now included in the small peer info document. (#10515)"}
:::
### C# Version 4.4.4
:::Changelog{title="Released: Thur Nov 2, 2023"}
::ChangelogItem{type="improved" description="Runtime validation of corrupted attachments being inserted into documents
(#10552)"}
::ChangelogItem{type="fixed" description="An issue introduced in 4.4.2 where the Small Peer Info attachments were not replicated to the Portal. (#10538)"}
::ChangelogItem{type="added" description="The SmallPeerInfo property to Ditto allowing to configure the collection and sync of Small Peer Info. (#10517)"}
:::
### C# Version 4.4.3
:::Changelog
::ChangelogItem{type="improved" description="Changed: Introduced custom implementations for DittoAttachmentToken's Equals() and GetHashCode() methods. ([C#] Override Equals and GetHashCode for DittoAttachementToken #10211)"}
:::
:::CodeblockTabs
CLI
```none
Install-Package Ditto -Version 4.4.3
```
Package Reference
```none
```
:::
### C# Version 4.4.2
:::Changelog
::ChangelogItem{type="fixed" description="Small Peer info collection now defaults to localPeerOnly, preventing data from being collected on the Big Peer until the feature is explicitly enabled and sync scope is set to bigPeerOnly. (#10203, #10204)"}
:::
### C# Version 4.4.1
:::Changelog
::ChangelogItem{type="added" description="Raise Exception when creating a LiveQuery or a Subscription after dropping the Ditto object. (#10062)"}
::ChangelogItem{type="fixed" description="An issue where the store .Update() API was not releasing transaction handle (rollback) when the provided delegate invocation throws. (#10064)"}
::ChangelogItem{type="fixed" description="Unexpected token error when installing Ditto 4.4.0 on Linux. (#10069)"}
:::
### C# Version 4.4.0
:::Changelog
::ChangelogItem{type="added" description="Support for AArch64 CPU architecture on Linux. (#9357)"}
::ChangelogItem{type="added" description="More informative log message for query failures caused by database access errors. (#9364)"}
::ChangelogItem{type="added" description="Small peers now persist structured log data to disk for later retrieval, with limits on the resulting disk usage. (#9547)"}
::ChangelogItem{type="added" description="More informative log message for query failures caused by database access errors. (#9364)"}
::ChangelogItem{type="improved" description="Print some internal errors in a more human-readable format. (#9269)"}
::ChangelogItem{type="improved" description="TransportConfig and its associated types can be serialized/deserialized into/from JSON and CBOR. (#9585)"}
::ChangelogItem{type="improved" description="Sets a minimum session refresh period. The small peer will always try to start refreshing its session after 3 days no matter how long the session period issue. Previously the small peer would start to refresh after half of the session length had elapsed. (#9594, #9645)"}
::ChangelogItem{type="improved" description="Initial replication time by reducing one roundtrip of messages before peers can sync. (#9404)"}
::ChangelogItem{type="improved" description="Attachment fetch time in several edge case scenarios. (#9501)"}
::ChangelogItem{type="improved" description="Efficiency by using less system resources when connected to peers but no replication changes are needing to be sent. (#9479, #7995)"}
::ChangelogItem{type="improved" description="Significantly reduced startup resource consumption linked to total document count. (#9501)"}
::ChangelogItem{type="fixed" description="A scenario where a peer could incorrectly receive data back from other peers even after they had modified their subscription and evicted the old data. (#9404)"}
::ChangelogItem{type="fixed" description="An issue where unusually high replication write load in large meshes could block all readers from reading the database. (#9395, #8872)"}
:::
### C# / .NET Version 4.3.1
:::Changelog{title="Released: Thu Aug 10th 2023, 2:22 pm"}
::ChangelogItem{type="improved" description="Changed: Improved clarity of error messages when data on disk cannot be read by this version following a downgrade from a newer version of Ditto. (#9267)"}
::ChangelogItem{type="improved" description="Changed: Print some internal errors in a more human-readable format. (#9495)"}
::ChangelogItem{type="added" description="Added: iOS can now connect to servers with custom certificates. (#9368)"}
::ChangelogItem{type="fixed" description="Fixed: an issue on Linux that caused excessive multicast traffic over LAN transport. (#9398)"}
:::
:::BlockQuote
Install-Package Ditto -Version 4.3.1
:::
PackageReference
:::BlockQuote
\
:::
[API Reference URL](https://software.ditto.live/dotnet/Ditto/4.3.1/api-reference/)
### C# / .NET Version 4.3.0
Released: Tue Jul 18th 2023, 10:02 pm
Release Notes:
⚠️ Warning: This SDK version will migrate some data formats on disk. Once upgraded to 4.3.0, an SDK can only be downgraded back to 4.2.2 and 4.2.1 but no earlier. Downgrading to versions earlier than 4.2.1 will require uninstalling and re-installing to clear out the new data formats. (#8946)
- Added: An internal ability to measure & report the level of redundancy in replication updates to calculate the percentage of updates that are arriving from multiple peers. This will be used for future self-balancing mesh actions which are not yet enabled. (#8937)
- Changed: new serialization format improves efficiency of replication, particularly in the Big Peer. (#8946)
- Changed: Better logging for diagnosing auth failures. (#8984)
- Changed: Improved replication performance by introducing a small internal caching layer for commonly computed values. (#8777)
- Fixed: The replication engine can now recover from certain filesystem corruption issues during sync instead of panicking. (#8965)
- Fixed: Increased validation of document updates, preventing updates that try to modify the document id. (#9063)
Installation:
Command Line
:::BlockQuote
Install-Package Ditto -Version 4.3.0
:::
PackageReference
:::BlockQuote
\
:::
[API Reference URL](https://software.ditto.live/dotnet/Ditto/4.3.0/api-reference/)
### C# / .NET Version 4.2.3
Released: Wed Jul 5th 2023, 3:32 pm
Release Notes:
- Synchronized version bump release
Installation:
Command Line
:::BlockQuote
Install-Package Ditto -Version 4.2.3
:::
PackageReference
:::BlockQuote
\
:::
[API Reference URL](https://software.ditto.live/dotnet/Ditto/4.2.3/api-reference/)
### C# / .NET Version 4.2.2
Released: Tue Jul 4th 2023, 10:42 am
Release Notes:
- Improved mesh performance when using 50+ Small Peer devices (#9077)
- Changed: Improved deserialization performance of Documents. (#9123)
- Fixed: Increased validation of document updates, preventing updates that try to modify the document id. (#9129)
- Fixed: Removed outdated ERROR level log statements in Ditto store related to
- Fixed: The
- Fixed: a potential crash if a document attachment was malformed (#9045)
Installation:
Command Line
:::BlockQuote
Install-Package Ditto -Version 4.2.2
:::
PackageReference
:::BlockQuote
\
:::
[API Reference URL](https://software.ditto.live/dotnet/Ditto/4.2.2/api-reference/)
### C# / .NET Version 4.2.1
Released: Tue Jun 13th 2023, 3:47 pm
Release Notes:
- Fixed: a possible crash due to serialisation when upgrading from version 4.1.0 or 4.1.1 (#8925)
Installation:
Command Line
:::BlockQuote
Install-Package Ditto -Version 4.2.1
:::
PackageReference
:::BlockQuote
\
:::
[API Reference URL](https://software.ditto.live/dotnet/Ditto/4.2.1/api-reference/)
### C# / .NET Version 4.2.0
Released: Tue Jun 13th 2023, 1:53 am
Release Notes:
- Changed: Improved replication uses compressed message stream to decrease bandwidth consumption. (#8807)
- Changed: Reduce verbosity in replication logs (#8370)
- Fixed: Potential crash on Linux when handling Bluetooth advertisement during Ditto startup (#8538)
Installation:
Command Line
:::BlockQuote
Install-Package Ditto -Version 4.2.0
:::
PackageReference
:::BlockQuote
\
:::
[API Reference URL](https://software.ditto.live/dotnet/Ditto/4.2.0/api-reference/)
### C# / .NET Version 4.1.1
Released: Thu May 18th 2023, 11:35 pm
Release Notes:
- Fixed: Devices with hostnames longer than 35 bytes will no longer fail to sync over LAN.
- Fixed: Potential crash on Linux when handling Bluetooth advertisement during Ditto startup.
Installation:
Command Line
:::BlockQuote
Install-Package Ditto -Version 4.1.1
:::
PackageReference
:::BlockQuote
\
:::
[API Reference URL](https://software.ditto.live/dotnet/Ditto/4.1.1/api-reference/)
### C# / .NET Version 4.1.0
Released: Fri Apr 28th 2023, 11:52 am
Release Notes:
- Added:
- Changed:
- Changed: (Experimental) Query Overlap Groups, Bus: a breaking protocol change for upcoming improvements. Peers using older versions will not be able to connect with newer peers until they upgrade.
- Fixed: improved Bluetooth LE connection reliability on Linux
- Fixed: A replication issue where certain cases that should have reset the replication session with a remote peer would instead temporarily terminate the connection while not resetting the session.
- Fixed: A replication issue that could cause failed convergence on small number of documents if updates are being received during a local eviction.
- Security: Enforce immediate disconnection of any connected peers whose certificate expires during a sync session.
Installation:
Command Line
:::BlockQuote
Install-Package Ditto -Version 4.1.0
:::
PackageReference
:::BlockQuote
\
:::
[API Reference URL](https://software.ditto.live/dotnet/Ditto/4.1.0/api-reference/)
### C# / .NET Version 4.0.3-alpha.linux-ble-fixes-2
Released: Tue Apr 18th 2023, 1:22 am
Release Notes:
- Improvements to Bluetooth connection reliability on Linux
Installation:
Command Line
:::BlockQuote
Install-Package Ditto -Version 4.0.3-alpha.linux-ble-fixes-2
:::
PackageReference
:::BlockQuote
\
:::
[API Reference URL](https://software.ditto.live/dotnet/Ditto/4.0.3-alpha.linux-ble-fixes-2/api-reference/)
### C# / .NET Version 4.0.3-alpha.linux-ble-fixes
Released: Mon Apr 17th 2023, 3:19 pm
Release Notes:
- Fixed: a replication issue that could cause failed convergence on small number of documents if updates are being received during a local eviction.
- Improvements to Bluetooth connection reliability on Linux
Installation:
Command Line
:::BlockQuote
Install-Package Ditto -Version 4.0.3-alpha.linux-ble-fixes
:::
PackageReference
:::BlockQuote
\
:::
[API Reference URL](https://software.ditto.live/dotnet/Ditto/4.0.3-alpha.linux-ble-fixes/api-reference/)
### C# / .NET Version 4.0.2
Released: Thu Apr 20th 2023, 3:36 pm
Release Notes:
- Fixed: A replication issue where certain cases that should have reset the replication session with a remote peer would instead temporarily terminate the connection while not resetting the session.
- Fixed: Correct handling of reset and disable errors from receive\_update
Installation:
Command Line
:::BlockQuote
Install-Package Ditto -Version 4.0.2
:::
PackageReference
:::BlockQuote
\
:::
[API Reference URL](https://software.ditto.live/dotnet/Ditto/4.0.2/api-reference/)
### C# / .NET Version 4.0.1
Released: Thu Apr 6th 2023, 11:54 am
Release Notes:
- Fixed: Resolved an issue with logging when the stdout is not available.
Installation:
Command Line
:::BlockQuote
Install-Package Ditto -Version 4.0.1
:::
PackageReference
:::BlockQuote
\
:::
[API Reference URL](https://software.ditto.live/dotnet/Ditto/4.0.1/api-reference/)
### C# / .NET Version 4.0.0
Released: Wed Mar 22nd 2023, 3:48 pm
Release Notes:
- Added: AddWins removes will now be used if
- Changed: If a problem occurs with an app's authentication webhook, the Small Peer that is trying to authenticate will log more detailed information for the developer.
- Changed: old multi-hop connections are now automatically disconnected when direct connections are established with peers, freeing up unneeded resources faster.
- Changed: reduced severity level for some routine log statements which were previously emitted at a WARN level.
- Fixed: some threads spawned by the SDK no longer wait up to 30 seconds before being stopped.
- Fixed: an issue which could cause Ditto to hang if more than 500 peers were encountered.
- Fixed: replication hanging under some circumstances, especially WebSocket connections to Big Peer
- Fixed: a possible crash if Ditto is configured with an invalid App ID. An error message is emitted instead.
Installation:
Command Line
:::BlockQuote
Install-Package Ditto -Version 4.0.0
:::
PackageReference
:::BlockQuote
\
:::
[API Reference URL](https://software.ditto.live/dotnet/Ditto/4.0.0/api-reference/)
### C# / .NET Version 4.0.0-beta1
Released: Thu Jan 26th 2023, 3:37 pm
Release Notes:
- Fixed: an issue which could cause Ditto to hang if more than 500 peers were encountered.
- Fixed: AddWins removes will now be used if
Installation:
Command Line
:::BlockQuote
Install-Package Ditto -Version 4.0.0-beta1
:::
PackageReference
:::BlockQuote
\
:::
[API Reference URL](https://software.ditto.live/dotnet/Ditto/4.0.0-beta1/api-reference/)
### C# / .NET Version 4.0.0-alpha2
Released: Mon Jan 16th 2023, 2:16 pm
Release Notes:
- Added:
Installation:
Command Line
:::BlockQuote
Install-Package Ditto -Version 4.0.0-alpha2
:::
PackageReference
:::BlockQuote
\
:::
[API Reference URL](https://software.ditto.live/dotnet/Ditto/4.0.0-alpha2/api-reference/)