apewer-dotnet/Apewer/Source/NotNullAttribute.cs

using System;

namespace Apewer.Source
{

    /// <summary>字段不能是 NULL 值。</summary>
    [AttributeUsage(AttributeTargets.Property, AllowMultiple = false, Inherited = true)]
    public sealed class NotNullAttribute : Attribute
    {

        /// <summary></summary>
        public override string ToString() => "Not Null";

    }

}