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Tag: fluentvalidation

2 posts

2026-10-12 fluentvalidation native-aot dotnet

FluentValidation 12.2 fixes IsInEnum() crashing native AOT apps on [Flags] enums

FluentValidation 12.2.0, released October 10, 2026, swaps Enum.GetValues for Enum.GetValuesAsUnderlyingType inside EnumValidator, so IsInEnum() on a [Flags] enum no longer throws NotSupportedException in a native AOT binary.

2026-04-29 blazor blazor-webassembly aspnetcore-11

How to share validation logic between server and Blazor WebAssembly

The single biggest source of validation drift in a Blazor WebAssembly + ASP.NET Core app is the urge to write the rules twice. This guide walks the only layout that scales in .NET 11: a Shared class library that owns the DTOs and their validators, consumed by both the WASM client (EditForm + DataAnnotationsValidator or Blazored.FluentValidation) and the server (minimal API endpoint filter or MVC model binding), with a tested round-trip that maps server-side ValidationProblemDetails back into the EditContext.