ValueAttribute.cs

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// Copyright 2005-2015 Giacomo Stelluti Scala & Contributors. All rights reserved. See License.md in the project root for license information.
 
using System;
 
namespace CommandLine
{
    [AttributeUsage(AttributeTargets.Property)]
    public sealed class ValueAttribute : BaseAttribute
    {
        private string metaName;
 
        public ValueAttribute(int index)
        {
            Index = index;
            metaName = string.Empty;
        }
 
        public int Index { get; }
 
        public string MetaName
        {
            get => metaName;
            set => metaName = value ?? throw new ArgumentNullException("value");
        }
    }
}