EmailAddressAttribute.cs

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namespace System.ComponentModel.DataAnnotations;
 
[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Parameter, AllowMultiple = false)]
public sealed class EmailAddressAttribute : DataTypeAttribute
{
    public EmailAddressAttribute()
        : base(DataType.EmailAddress)
    {
        base.DefaultErrorMessage = System.SR.EmailAddressAttribute_Invalid;
    }
 
    public override bool IsValid(object? value)
    {
        if (value == null)
        {
            return true;
        }
        if (!(value is string text))
        {
            return false;
        }
        int num = text.IndexOf('@');
        if (num > 0 && num != text.Length - 1)
        {
            return num == text.LastIndexOf('@');
        }
        return false;
    }
}