FWest98

using System;
using Microsoft.AspNetCore.Mvc.ModelBinding.Validation;

namespace Foo {
    // Implementation makes use of the IPropertyValidationFilter interface that allows
    // control over whether the attribute (and its children, if relevant) need to be
    // validated.
    [AttributeUsage(AttributeTargets.Class | AttributeTargets.Property, AllowMultiple = false, Inherited = true)]
    public class ConditionalValidationAttribute : Attribute, IPropertyValidationFilter {
        public string OtherProperty { get; set; }

FWest98

using System.Collections.Generic;
using System.Text.Encodings.Web;
using Microsoft.AspNetCore.Antiforgery;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.ModelBinding;
using Microsoft.AspNetCore.Mvc.Rendering;
using Microsoft.AspNetCore.Mvc.Routing;
using Microsoft.AspNetCore.Mvc.ViewFeatures;
using Microsoft.Extensions.Options;

FWest98

### Keybase proof

I hereby claim:

  * I am FWest98 on github.
  * I am fwest98 (https://keybase.io/fwest98) on keybase.
  * I have a public key whose fingerprint is EB40 A06C 490B B16D C28F  7540 6394 EA2F 6F8F 92A1

To claim this, I am signing this object:

FWest98

using System;
using System.Globalization;
using System.Linq;
using System.Windows.Forms;

namespace System.Windows.Forms {
    public static class DynamicInvokers {
        // This would replace a Control.Property = value
        private delegate void SetPropertyCallBack(Control c, string property, dynamic value);