/// <summary>
/// Determines if the specified tracking number is a USPS
/// tracking number by using a standard MOD 10 algorithm
/// to check the check digit.
/// </summary>
/// <param name="trackingNumber">
/// The tracking number to check the check digit of.
/// </param>
/// <returns>
/// True if the tracking number is the correct length and contains
/// a valid check digit, otherwise false.
/// </returns>
public static bool IsUspsTrackingNumber(string trackingNumber)
{
if (trackingNumber.Length != 22 && trackingNumber.Length != 20)
{
return(false);
}
return(CheckDigits.CheckMod10CheckDigit(trackingNumber));
}
/// <summary>
/// Runs the FedEx checksum algorithm and length check on the ground tracking number.
/// </summary>
/// <param name="trackingNumber">
/// The tracking number to verify the check digit on.
/// </param>
/// <returns>
/// True if the tracking number appears to be a valid FedEx ground tracking number,
/// otherwise false is returned.
/// </returns>
public static bool IsFedExGround(string trackingNumber)
{
if (trackingNumber.Length != 15)
{
return(false);
}
return(CheckDigits.CheckMod10CheckDigit(trackingNumber));
}
/// <summary>
/// Determines if the string is a valid UPS tracking number
/// according to the UPS checksum algorithms.
/// </summary>
/// <param name="trackingNumber">
/// The tracking number to classify as valid or invalid.
/// </param>
/// <returns>
/// A boolean indicating if the tracking number passes the
/// check digit calculations.
/// </returns>
public static bool IsValidTrackingNumber(string trackingNumber)
{
//Handle 1Z tracking numbers a special way
if (trackingNumber.StartsWith("1z", true, CultureInfo.InvariantCulture))
{
//Trim off the 1Z
trackingNumber = trackingNumber.Substring(2);
//Encode the letters into numbers based on the cross-reference
trackingNumber = ConvertToNumeric(trackingNumber);
return(Check1ZMod10CheckDigit(trackingNumber));
}
if (trackingNumber.Length != 11)
{
return(false);
}
//Encode the letters into numbers based on the cross-reference
trackingNumber = ConvertToNumeric(trackingNumber);
return(CheckDigits.CheckMod10CheckDigit(trackingNumber));
}
