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Validação de CPF e CNPJ - C#
namespace CpfCnpj
{
public static class CpfCnpjUtils
{
public static bool IsValid(string cpfCnpj)
{
return (IsCpf(cpfCnpj) || IsCnpj(cpfCnpj));
}
private static bool IsCpf(string cpf)
{
int[] multiplicador1 = new int[9] { 10, 9, 8, 7, 6, 5, 4, 3, 2 };
int[] multiplicador2 = new int[10] { 11, 10, 9, 8, 7, 6, 5, 4, 3, 2 };
cpf = cpf.Trim().Replace(".", "").Replace("-", "");
if (cpf.Length != 11)
return false;
for (int j = 0; j < 10; j++)
if (j.ToString().PadLeft(11, char.Parse(j.ToString())) == cpf)
return false;
string tempCpf = cpf.Substring(0, 9);
int soma = 0;
for (int i = 0; i < 9; i++)
soma += int.Parse(tempCpf[i].ToString()) * multiplicador1[i];
int resto = soma % 11;
if (resto < 2)
resto = 0;
else
resto = 11 - resto;
string digito = resto.ToString();
tempCpf = tempCpf + digito;
soma = 0;
for (int i = 0; i < 10; i++)
soma += int.Parse(tempCpf[i].ToString()) * multiplicador2[i];
resto = soma % 11;
if (resto < 2)
resto = 0;
else
resto = 11 - resto;
digito = digito + resto.ToString();
return cpf.EndsWith(digito);
}
private static bool IsCnpj(string cnpj)
{
int[] multiplicador1 = new int[12] { 5, 4, 3, 2, 9, 8, 7, 6, 5, 4, 3, 2 };
int[] multiplicador2 = new int[13] { 6, 5, 4, 3, 2, 9, 8, 7, 6, 5, 4, 3, 2 };
cnpj = cnpj.Trim().Replace(".", "").Replace("-", "").Replace("/", "");
if (cnpj.Length != 14)
return false;
string tempCnpj = cnpj.Substring(0, 12);
int soma = 0;
for (int i = 0; i < 12; i++)
soma += int.Parse(tempCnpj[i].ToString()) * multiplicador1[i];
int resto = (soma % 11);
if (resto < 2)
resto = 0;
else
resto = 11 - resto;
string digito = resto.ToString();
tempCnpj = tempCnpj + digito;
soma = 0;
for (int i = 0; i < 13; i++)
soma += int.Parse(tempCnpj[i].ToString()) * multiplicador2[i];
resto = (soma % 11);
if (resto < 2)
resto = 0;
else
resto = 11 - resto;
digito = digito + resto.ToString();
return cnpj.EndsWith(digito);
}
}
}
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