ValidationResult.cs

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using System.Collections.Generic;
 
namespace System.ComponentModel.DataAnnotations;
 
public class ValidationResult
{
    public static readonly ValidationResult? Success;
 
    public IEnumerable<string> MemberNames { get; }
 
    public string? ErrorMessage { get; set; }
 
    public ValidationResult(string? errorMessage)
        : this(errorMessage, null)
    {
    }
 
    public ValidationResult(string? errorMessage, IEnumerable<string>? memberNames)
    {
        ErrorMessage = errorMessage;
        MemberNames = memberNames ?? Array.Empty<string>();
    }
 
    protected ValidationResult(ValidationResult validationResult)
    {
        if (validationResult == null)
        {
            throw new ArgumentNullException("validationResult");
        }
        ErrorMessage = validationResult.ErrorMessage;
        MemberNames = validationResult.MemberNames;
    }
 
    public override string ToString()
    {
        return ErrorMessage ?? base.ToString();
    }
}