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FluentValidation: our changes to an open source project

A popular .NET library for writing strongly typed validation rules.

All contributions
Language
C#
GitHub stars
9,756
1merged change
Merged on 9 September 2026.
Number 19 of the 64 GitHub projects with our changes, by stars. First is Zed (91,587).

The change merged into FluentValidation

Range validation rejects an inverted range even when the comparer returns any negative number, not only -1.

What it taught us

The .NET comparison contract only promises the sign of the result. Code that checks for exactly -1 works until the first comparer that returns -2.

C# and .NET

Our projects in this technology, their screens and when we choose it.

Other projects with our changes: C# and .NET

7 projects in this technology have our merged changes. The bar is the repository's stars, next to it the number of our changes. Each row leads to the project's page.

C# and .NET

FluentValidation among all our changes

Day by day from 5 September 2026 to 11 October 2026. A column is every change merged that day, the accent is the changes in FluentValidation.

  • Changes in FluentValidation
  • Changes in other projects

1 merged change in FluentValidation

Merged on 9 September 2026.

On the same day

Changes of ours were also merged into: Monolog, stats.

The whole period

125 merged changes in 65 projects.

Questions about our changes to FluentValidation

Where these changes come from, who merged them and whether we can fix something in your library.

Using FluentValidation in your project?

If something in it does not work, we fix it at the source and leave a workaround until the release. We reply within an hour.