Run ASP.NET Core default validation first

System Details

• FluentValidation version: 8.0.100
• Web Framework version (eg ASP.NET Core 2.1, MVC 5, WebApi 2. Delete if not applicable): ASP.NET Core 2.1

Issue Description

What I am looking for is basically exact opposite of :

.AddFluentValidation(fv =>
                {
                    fv.RunDefaultMvcValidationAfterFluentValidationExecutes = true;
                })

Basically, trying to run the default data annotation validations before fluent validation validators

[JeremySkinner]

DataAnnotations tends to mess with FluentValidation if it runs first, as if DataAnnotations encounters a validation failure then it will not allow FV to add any errors for the same property (or this certainly used to be the case). This is usually undesirable, which is why FV should typically run first. I don’t really feel there’s a need to make it configurable as it’s easy enough to swap them around in an AddMvcOptions call if you really want to do it.

[JeremySkinner]

The ModelValidatorProviders collection is part of MVC - take a look at the AddMvcOptions method that allows you to customise the MVC bootstrapping process:

.AddFluentValidation(...).AddMvcOptions(options => {
	// access options.ModelValidatorProviders here, reorder as necessary 
});