FluentValidation.AspNetCore is not working in Class Library

I am using library "FluentValidation.AspNetCore": "6.4.0-beta3" in .netcore WebApi in a project. You can see the project structure below. Library is working fine if i place the CurrencyDTO.cscode in section 2 (Project FH.WebAPI) and if the same code placed in section 1 (Class Library DTO) its not working. And requirement is that i have to place code in Class library FH.Common. Is there any work around.I have search but didn't find any thing

Project Structure

CurrencyDTO.cs

[Validator(typeof(CurrencyDTOValidator))] public class CurrencyDTO { public int Id { get { return CurrencyId; } } public int CurrencyId { get; set; } public string Name { get; set; } public string Symbol { get; set; } } public class CurrencyDTOValidator : AbstractValidator<CurrencyDTO> { public CurrencyDTOValidator() { RuleFor(x => x.Name).NotEmpty().NotNull().WithMessage("The currency 'Name' is required.") .Length(0, 250).WithMessage("The currency 'Name' cannot be more than 250 characters."); RuleFor(x => x.Symbol).NotEmpty().WithMessage("The currency Symbol is required."); } } 

Library Configuration

Step 1) . Add in project.json

{ "dependencies": { "Autofac": "4.3.0", "Autofac.Extensions.DependencyInjection": "4.0.0", "AutoMapper": "5.2.0", "EntityFramework": "6.1.3", "FH.Business": "1.0.0-*", "FH.Common": "1.0.0-*", "JWT": "1.4.1-beta", "Microsoft.AspNet.Http.Extensions": "1.0.0-rc1-final", "Microsoft.AspNet.WebApi.Client": "5.2.3", "Microsoft.AspNet.WebApi.Core": "5.2.3", "Microsoft.AspNetCore.Authentication.JwtBearer": "1.1.0", "Microsoft.AspNetCore.Diagnostics": "1.1.0", "Microsoft.AspNetCore.Mvc": "1.1.1", "Microsoft.AspNetCore.Razor.Tools": { "version": "1.0.0-preview2-final", "type": "build" }, //other libraries.. "FluentValidation.AspNetCore": "6.4.0-beta3" //<------Here }, "tools": { "BundlerMinifier.Core": "2.0.238", "Microsoft.AspNetCore.Razor.Tools": "1.0.0-preview2-final", "Microsoft.AspNetCore.Server.IISIntegration.Tools": "1.0.0-preview2-final" }, "frameworks": { "net461": { "frameworkAssemblies": { "System.Drawing": "4.0.0.0" } } }, "buildOptions": { "emitEntryPoint": true, "preserveCompilationContext": true }, "publishOptions": { "include": [ "wwwroot", "Views", "Areas/**/*.cshtml", "appsettings.json", "web.config" ] }, "scripts": { "prepublish": [ "bower install", "dotnet bundle" ], "postpublish": [ "dotnet publish-iis --publish-folder %publish:OutputPath% --framework %publish:FullTargetFramework%" ] } } 

Step 2). In Startup.cs

 public void ConfigureServices(IServiceCollection services) { // Add framework services. services.AddMvc(options => { }).AddFluentValidation(fv => fv.RegisterValidatorsFromAssemblyContaining<Startup>()); // Other code.. } 

Used in Controller

[HttpPost] [Route("CreateCurrency")] public IActionResult CreateCurrency([FromBody] CurrencyDTO model) { if (!ModelState.IsValid) //<----Validate here { return new BadRequestObjectResult(ModelState); } //Other Code.. } 

1 Answer

The problem was in a registration line in startup.csand thank to @JeremySkinner who have suggested me the right way and i am quoting his answer here.

My mistake

services.AddFluentValidation(fv => fv.RegisterValidatorsFromAssemblyContaining<Startup>()); 

Replace

RegisterValidatorsFromAssemblyContaining<Startup>() 

with

RegisterValidatorsFromAssemblyContaining<CurrencyDTOValidator>() 

Actual link to the Issue

Link Description

Above link is the answers posted @JeremySkinner