IndexAttribute.cs

using System;
 
namespace Waher.Persistence.Attributes
{
    [AttributeUsage(AttributeTargets.Class | AttributeTargets.Struct, AllowMultiple = true, Inherited = true)]
    public class IndexAttribute : Attribute
    {
        private readonly string[] fieldNames;
 
        public IndexAttribute(params string[] FieldNames)
        {
            if (FieldNames.Length == 0)
                throw new ArgumentException("No field names listed.", nameof(FieldNames));
 
            this.fieldNames = FieldNames;
        }
 
        public string[] FieldNames => this.fieldNames;
    }
}