AllowHtmlAttribute.cs

// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.

namespace System.Web.Mvc
{
    // This attribute can be applied to a model property to specify that the particular property to
    // which it is applied should not go through request validation.

    [AttributeUsage(AttributeTargets.Property, AllowMultiple = false, Inherited = true)]
    public sealed class AllowHtmlAttribute : Attribute, IMetadataAware
    {
        public void OnMetadataCreated(ModelMetadata metadata)
        {
            if (metadata == null)
            {
                throw new ArgumentNullException("metadata");
            }

            metadata.RequestValidationEnabled = false;
        }
    }
}