Ryan 0b91afadef Fix C# null string serialization error + add regression coverage for Issue #3960 (#3967) ...

# Description of Changes
This PR fixes a C# SDK/BSATN serialization issue where inserting a
`null` string into a non-nullable `string` column could throw an
`ArgumentNullException` with an unhelpful stack trace, as reported in
[#3960](https://github.com/clockworklabs/SpacetimeDB/issues/3960).

* Updated the C# BSATN runtime to reject `null` for non-nullable
`string` serialization with a clear, actionable error message (guides
users to model nullable strings as `string?` so BSATN encodes an
option).
* Added BSATN runtime unit tests to cover:
  * Non-nullable string rejects `null` with an actionable message
* Nullable string (`RefOption<string, BSATN.String>`) round-trips `null`
* Added end-to-end C# regression-test module + client assertions for
#3960:
  * Inserting `""` into non-nullable `string` succeeds
* Inserting `null` into non-nullable `string` fails with the expected
message
* Inserting `null` into nullable `string?` succeeds and round-trips as
`null`
# API and ABI breaking changes
None.
* No schema or wire-format changes.
* Behavior change is limited to improving the error surfaced when
attempting to serialize null as a non-nullable BSATN `String`, plus
stricter input validation for `ConnectionId` / `Identity` parsing.
# Expected complexity level and risk
2 - Low
* Changes are isolated to regression test coverage.
* No impact on valid serialization paths; only affects invalid/malformed
inputs and improves diagnostics.
# Testing
- [X] Ran C# regression-tests client and verified new tests pass.

---------

Signed-off-by: Ryan <r.ekhoff@clockworklabs.io>
Co-authored-by: John Detter <4099508+jdetter@users.noreply.github.com>

2026-01-09 21:46:52 +00:00

..

BSATN.Runtime.Tests.csproj

C# implementation of Transactions for Procedures (#3809)

2025-12-18 18:41:47 +00:00

Tests.cs

Fix C# null string serialization error + add regression coverage for Issue #3960 (#3967)

2026-01-09 21:46:52 +00:00