AssociationAttribute.cs

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using System.Collections.Generic;
 
namespace System.ComponentModel.DataAnnotations;
 
[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field, AllowMultiple = false, Inherited = true)]
[Obsolete("AssociationAttribute has been deprecated and is not supported.")]
public sealed class AssociationAttribute : Attribute
{
    public string Name { get; }
 
    public string ThisKey { get; }
 
    public string OtherKey { get; }
 
    public bool IsForeignKey { get; set; }
 
    public IEnumerable<string> ThisKeyMembers => GetKeyMembers(ThisKey);
 
    public IEnumerable<string> OtherKeyMembers => GetKeyMembers(OtherKey);
 
    public AssociationAttribute(string name, string thisKey, string otherKey)
    {
        Name = name;
        ThisKey = thisKey;
        OtherKey = otherKey;
    }
 
    private static string[] GetKeyMembers(string key)
    {
        if (key == null)
        {
            return Array.Empty<string>();
        }
        return key.Replace(" ", string.Empty).Split(',');
    }
}