Reports

For ASP.NET Core with .NET 9, based on @LazZiya's answer and the asp.net docs on how to resolve a service at app startup, this is how I did it in the Program.cs file:

Configure localization services:

builder.Services.AddLocalization(options => options.ResourcesPath = "Resources");

builder.Services.AddMvc()
    .AddViewLocalization(LanguageViewLocationExpanderFormat.Suffix)
    .AddDataAnnotationsLocalization();

(source)

Create the resource files

File SharedResource.en.resx in the Resources/ path.

Name	en
Validation_ValueMustNotBeNull	The field '{0}' is required.
Validation_AttemptedValueIsInvalid	The value '{0}' is not valid for the field '{1}'.

Override the default model binding error messages:

var app = builder.Build();

using (var serviceScope = app.Services.CreateScope())
{
    var services = serviceScope.ServiceProvider;

    var localizer = services.GetRequiredService<IStringLocalizer<SharedResource>>();
    var options = services.GetRequiredService<IOptions<MvcOptions>>().Value;

    options.ModelBindingMessageProvider.SetValueMustNotBeNullAccessor((field) => localizer["Validation_ValueMustNotBeNull", field]);
    options.ModelBindingMessageProvider.SetAttemptedValueIsInvalidAccessor((value, field) => localizer["Validation_AttemptedValueIsInvalid", value, field]);
    // ...
}

You can check here all the available properties you can override.

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