SocialPub/SocialPub.ClientModels/AtLeastOnePropertyAttribute.cs

using System.ComponentModel.DataAnnotations;
using System.Reflection;

namespace SocialPub.ClientModels
{
	[AttributeUsage(AttributeTargets.Class, AllowMultiple = true)]
	public class AtLeastOnePropertyAttribute : ValidationAttribute
	{
		private string[] PropertyList { get; set; }

		public AtLeastOnePropertyAttribute(params string[] propertyList)
		{
			PropertyList = propertyList;
		}

		public override object TypeId
		{
			get
			{
				return this;
			}
		}

		public override bool IsValid(object value)
		{
			PropertyInfo propertyInfo;
			foreach (string propertyName in PropertyList)
			{
				propertyInfo = value.GetType().GetProperty(propertyName);

				if (propertyInfo != null && propertyInfo.GetValue(value, null) != null)
					return true;
			}

			return false;
		}
	}
}