PhoneAttribute.cs

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namespace System.ComponentModel.DataAnnotations;
 
[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Parameter, AllowMultiple = false)]
public sealed class PhoneAttribute : DataTypeAttribute
{
    public PhoneAttribute()
        : base(DataType.PhoneNumber)
    {
        base.DefaultErrorMessage = System.SR.PhoneAttribute_Invalid;
    }
 
    public override bool IsValid(object? value)
    {
        if (value == null)
        {
            return true;
        }
        if (!(value is string text))
        {
            return false;
        }
        string potentialPhoneNumber = text.Replace("+", string.Empty).TrimEnd();
        potentialPhoneNumber = RemoveExtension(potentialPhoneNumber);
        bool flag = false;
        string text2 = potentialPhoneNumber;
        foreach (char c in text2)
        {
            if (char.IsDigit(c))
            {
                flag = true;
                break;
            }
        }
        if (!flag)
        {
            return false;
        }
        string text3 = potentialPhoneNumber;
        foreach (char c2 in text3)
        {
            if (!char.IsDigit(c2) && !char.IsWhiteSpace(c2) && "-.()".IndexOf(c2) == -1)
            {
                return false;
            }
        }
        return true;
    }
 
    private static string RemoveExtension(string potentialPhoneNumber)
    {
        int num = potentialPhoneNumber.LastIndexOf("ext.", StringComparison.OrdinalIgnoreCase);
        if (num >= 0)
        {
            string potentialExtension = potentialPhoneNumber.Substring(num + "ext.".Length);
            if (MatchesExtension(potentialExtension))
            {
                return potentialPhoneNumber.Substring(0, num);
            }
        }
        num = potentialPhoneNumber.LastIndexOf("ext", StringComparison.OrdinalIgnoreCase);
        if (num >= 0)
        {
            string potentialExtension2 = potentialPhoneNumber.Substring(num + "ext".Length);
            if (MatchesExtension(potentialExtension2))
            {
                return potentialPhoneNumber.Substring(0, num);
            }
        }
        num = potentialPhoneNumber.LastIndexOf("x", StringComparison.OrdinalIgnoreCase);
        if (num >= 0)
        {
            string potentialExtension3 = potentialPhoneNumber.Substring(num + "x".Length);
            if (MatchesExtension(potentialExtension3))
            {
                return potentialPhoneNumber.Substring(0, num);
            }
        }
        return potentialPhoneNumber;
    }
 
    private static bool MatchesExtension(string potentialExtension)
    {
        potentialExtension = potentialExtension.TrimStart();
        if (potentialExtension.Length == 0)
        {
            return false;
        }
        string text = potentialExtension;
        foreach (char c in text)
        {
            if (!char.IsDigit(c))
            {
                return false;
            }
        }
        return true;
    }
}