Issues

• Async multi-map records cache reuse on first execution, preventing eviction of one-off SQL, occasionally leading to OOM

  DapperLib/Dapper#2240 · opened on Oct 6, 2026

• Dapper.StrongName 2.1.86 fails strong-name signature verification (all TFMs) — works in 2.1.79

  DapperLib/Dapper#2236 · opened on Sep 22, 2026
  3

• New Decimal types support

  DapperLib/Dapper#2235 · opened on Sep 20, 2026

• SQL Server sql_variant mapping regression in 2.1.86: SERVERPROPERTY Int32 to bool throws InvalidCastException

  DapperLib/Dapper#2234 · opened on Sep 17, 2026

• PostgreSQL SMALLINT[] mapping fails in Dapper 2.1.86 but works in 2.1.79

  DapperLib/Dapper#2231 · opened on Sep 13, 2026

• Query<DateOnly> / Query<TimeOnly> (scalar form) silently return default(T)

  DapperLib/Dapper#2227 · opened on Aug 20, 2026

• DateOnly/DateTime coercion gaps on 'date' columns (breaks with Npgsql 10, and SqlClient the other way)

  DapperLib/Dapper#2226 · opened on Aug 20, 2026

• cmd.Cancel() in QueryRowImpl finally block causes ORA-1013 on Oracle Database Queries

  DapperLib/Dapper#2215 · opened on Jun 19, 2026
  2

• Proposal: Built-in extensibility for structured logging (commands, parameters, connections, transactions)

  DapperLib/Dapper#2201 · opened on Mar 30, 2026
  3

• No QueryAsync overload which accepts CommandDefinition, for cancellation, and Type array, for unbounded map

  DapperLib/Dapper#2193 · opened on Feb 22, 2026
  1

• Feature Request: Support for Open Generic TypeHandler registration

  DapperLib/Dapper#2190 · opened on Feb 4, 2026
  1

• QueryUnbufferedAsync cancels command unnecessarily for Npgsql, causing performance degradation

  DapperLib/Dapper#2188 · opened on Jan 16, 2026
  1

• Nullable input parameter not supplied when NULL

  DapperLib/Dapper#2187 · opened on Jan 8, 2026
  3

• Command not disposed with async using and ExecuteReaderAsync

  DapperLib/Dapper#2185 · opened on Nov 13, 2025
  1

• [Question]: Unused value in the QueryAsync<T>

  DapperLib/Dapper#2184 · opened on Oct 30, 2025
  4

• Literal replacements causing DAP214

  DapperLib/Dapper#2181 · opened on Sep 28, 2025
  1

• Possible bug: GridReader constructor uses DynamicParameters cast instead of IParameterCallbacks

  DapperLib/Dapper#2179 · opened on Aug 22, 2025
  1

• Improve AI documentation to include Logging preferences

  DapperLib/Dapper#2176 · opened on Jul 24, 2025
  1

• Cache purge tweaking

  DapperLib/Dapper#2173 · opened on Jun 13, 2025
  7

• Dapper TVP Behavior and SQL Server Monitoring Overhead

  DapperLib/Dapper#2170 · opened on Jun 3, 2025
  2

• All nuget packages to consist of strong named dll

  DapperLib/Dapper#2169 · opened on May 30, 2025
  9

• [Optimization] Proposal: Span-based mapping for reduced allocations

  DapperLib/Dapper#2166 · opened on May 13, 2025
  5

• Using custom Dapper ITypeHandler for parsing data but cause conflict to handle SQL parameters

  DapperLib/Dapper#2165 · opened on May 12, 2025

• Proposal: Custom Deserializer Methods

  DapperLib/Dapper#2164 · opened on May 1, 2025
  3

• Does't support SQLite at Linux ARM64

  DapperLib/Dapper#2162 · opened on Apr 28, 2025
  4