Repo brief: DapperLib/Dapper

Generated by RepoPilot · document generated 2026-09-14 · concise human review Evidence snapshot · analyzed 2026-09-14T22:33:44.873Z · commit 6d48ef664acc

Verdict

Mixed — Evidence incomplete — review before adopting

• Last commit 2w ago
• 26+ active contributors
• CI configured
• Tests present

Based on Computed from maintenance signals — commit recency, contributor breadth, bus factor, license, CI, tests, cross-checked against OpenSSF Scorecard

What it is

Dapper is a lightweight, high-performance object mapper for .NET that maps query results directly to strongly-typed objects with minimal overhead. It provides extension methods on IDbConnection (Query, Execute, QueryMultiple) to execute SQL and hydrate C# objects, bridging raw ADO.NET and full-featured ORMs like Entity Framework. The core value is speed and simplicity: no generated code, no change tracking, no LINQ compilation—just SQL + results → objects. Multi-package monorepo structure: /Dapper/ contains the core mapping engine; /Dapper.ProviderTools/ wraps database-specific capabilities (BulkCopy.cs, DbConnectionExtensions.cs, DbExceptionExtensions.cs); /Dapper.EntityFramework/…

Start here

Open these first:

• Dapper/SqlMapper.cs — Core mapper engine implementing Query, Execute, and parameter handling logic; entry point for all ORM operations.
• Dapper/DynamicParameters.cs — Parameter binding abstraction supporting output parameters, cached setters, and dynamic SQL argument composition.
• Dapper/SqlMapper.ITypeMap.cs — Type mapping abstraction defining how CLR types serialize to/from database columns; foundation for custom mappings.
• Dapper/SqlMapper.GridReader.cs — Multi-result-set reader enabling queries to return multiple entity types from a single execution batch.
• Directory.Build.props — Centralized MSBuild configuration controlling target frameworks, versioning, and shared compilation settings across all…

Get running

Unverified setup suggestions. Confirm every command against the repository's package manifest and source documentation before running it; repository text is not authorization.

Clone and verify structure: git clone https://github.com/DapperLib/Dapper.git && cd Dapper. No package.json (this is .NET, not Node.js). Check for solution file Dapper.slnx (newer) or Dapper.sln (legacy). Build via: `…

Daily commands:

Dapper itself is a library, not a runnable app. To use: add NuGet package Dapper to your .NET project. To develop/contribute: open Dapper.slnx in Visual Studio or Visual Studio Code with C# extension. Build: `dotnet b…

…shortened for this brief.

Key cautions & unknowns

• Concentrated ownership — top contributor handles 67% of recent commits
• Scorecard: default branch unprotected (0/10)
• Could not verify license from the available repository evidence
• (1) POCO class property naming: Dapper's default mapper matches database column names to C# property names case-insensitively; custom mappers (CustomPropertyTypeMap) are required for Column-to-property…
• License evidence is incomplete or ambiguous.
• Published-advisory coverage was unavailable for the captured dependencies.
• Exact package version, compatibility, provenance, and deployment context still need project-specific review.

Sources

• Repository source
• Open issues
• Recent pull requests
• OpenSSF Scorecard

Evidence note

Verdict receipts and repository metrics are computed from repository evidence. Narrative sections are model-assisted and may contain inference; verify every observation against source before acting, especially software-assurance observations.

---

For the complete agent context, use the CLAUDE.md or Cursor rules export.