public bool Validate()
{
if (string.IsNullOrEmpty(CPF))
{
return(false);
}
var cpf = CPF.Replace(".", "").Replace("-", "");
if (cpf.Length != 11)
{
return(false);
}
if (!cpf.All(char.IsNumber))
{
return(false);
}
var first = cpf[0];
if (cpf.Substring(1, 10).All(x => x == first))
{
return(false);
}
int[] multiplier1 = new int[9] {
10, 9, 8, 7, 6, 5, 4, 3, 2
};
int[] multiplier2 = new int[10] {
11, 10, 9, 8, 7, 6, 5, 4, 3, 2
};
string temp;
string digit;
int sum;
int rest;
temp = cpf.Substring(0, 9);
sum = 0;
for (int i = 0; i < 9; i++)
{
sum += int.Parse(temp[i].ToString()) * multiplier1[i];
}
// 873.143.810-54
rest = sum % 11;
rest = rest < 2 ? 0 : 11 - rest;
digit = rest.ToString();
temp += digit;
sum = 0;
for (int i = 0; i < 10; i++)
{
sum += int.Parse(temp[i].ToString()) * multiplier2[i];
}
rest = sum % 11;
rest = rest < 2 ? 0 : 11 - rest;
digit += rest.ToString();
if (cpf.EndsWith(digit))
{
return(true);
}
return(false);
}
