C# strings silently kill your SQL Server indexes in Dapper

🚨 Silent Index Killers: C# strings can secretly destroy SQL Server indexes when used with Dapper, leading to severe performance degradation due to implicit conversions that negate index benefits, ultimately causing slower query execution and decreased overall database efficiency. This issue has significant practical value as it can help developers optimize their database interactions and improve application performance.

guid

https://news.ycombinator.com/item?id=47282230

source_url

https://consultwithgriff.com/dapper-nvarchar-implicit-conversion-performance-trap

author_name

PretzelFisch

id: 564
uid: fPLUv
insdate: 2026-03-07 01:05:17
title: C# strings silently kill your SQL Server indexes in Dapper
additional: 🚨 Silent Index Killers: C# strings can secretly destroy SQL Server indexes when used with Dapper, leading to severe performance degradation due to implicit conversions that negate index benefits, ultimately causing slower query execution and decreased overall database efficiency. This issue has significant practical value as it can help developers optimize their database interactions and improve application performance.
category: Hacker News
md5:
guid: https://news.ycombinator.com/item?id=47282230
source_url: https://consultwithgriff.com/dapper-nvarchar-implicit-conversion-performance-trap
updated:
image:
author_name: PretzelFisch
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