Funções básicas
Iniciando o primeiro post desta categoria mostrando algumas das funções básicas (Mas essenciais) na utilização da NFe com .NET.
Módulo 11 – Para calculo do digito verificado da Chave.
Com certeza esta função pode ser reduzida para menos linhas… se o fizer, por favor deixe um comentário com o código, sugestões são sempre bem vindas 
public static int modulo11(string chaveNFE)
{
if (chaveNFE.Length != 43)
throw new Exception("Chave inválida, não é possível calcular o digito verificador");
string baseCalculo = "4329876543298765432987654329876543298765432";
int somaResultados = 0;
for (int i = 0; i <= chaveNFE.Length - 1; i++)
{
int numNF = Convert.ToInt32(chaveNFE[i].ToString());
int numBaseCalculo = Convert.ToInt32(baseCalculo[i].ToString());
somaResultados += (numBaseCalculo * numNF);
}
int restoDivisao = (somaResultados % 11);
int dv = 11 - restoDivisao;
if ((dv == 0) || (dv > 9))
return 0;
else
return dv;
}
Remover Acentos
Esta função não é de minha autoria, peguei no Google um tempo atrás e realmente não lembro mais de onde ela foi retirada.
public static string TirarAcento(string palavra)
{
string palavraSemAcento = "";
string caracterComAcento = "áàãâäéèêëíìîïóòõôöúùûüçÁÀÃÂÄÉÈÊËÍÌÎÏÓÒÕÖÔÚÙÛÜÇ";
string caracterSemAcento = "aaaaaeeeeiiiiooooouuuucAAAAAEEEEIIIIOOOOOUUUUC";
for (int i = 0; i < palavra.Length; i++)
{
if (caracterComAcento.IndexOf(Convert.ToChar(palavra.Substring(i, 1))) >= 0)
{
int car = caracterComAcento.IndexOf(Convert.ToChar(palavra.Substring(i, 1)));
palavraSemAcento += caracterSemAcento.Substring(car, 1);
}
else
{
palavraSemAcento += palavra.Substring(i, 1);
}
}
return palavraSemAcento;
}
Remove formatação
Remove formatação de CNPJ/IE/RG/CPF, entre outros
public static string removeFormatacao(string texto)
{
string txt = "";
txt = texto.Replace(".", "");
txt = txt.Replace("-", "");
txt = txt.Replace("/", "");
txt = txt.Replace("(", "");
txt = txt.Replace(")", "");
txt = txt.Replace(" ", "");
return txt;
}
Por enquanto é isso, em breve (Ainda esta semana acredito eu) estarei postando uma classe para geração de XML, assim como exemplos para conexão com WebService, assinatura digital, cadeias de certificado, utilização de certificados A1 e A3 e etc.
Abraços
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