如何在 C# 中对没有 BOM 前导码的签名 xml 文件进行 UTF8 编码

Question

我有一个对我的 xml 文件进行签名的函数，该文件采用 utf-8 编码，但是当我应用该符号时，它显示“utf-8 with Boom”（错误版本），我如何正确保存文件

private static void FirmarDocumentoComplemento(string pathXmlDocument, string pathCert, string passCert, string pathXmlSignet, string ruta, string rut, string fecha, string tipo)

{

    XmlDocument documentXml = new XmlDocument();

    documentXml.Load(pathXmlDocument);

    SignedXml firmado = new SignedXml(documentXml);

    var cert = RSA_helper.GetX509Certificate(pathCert, passCert);

    firmado.SigningKey = (RSA)cert.PrivateKey;

    firmado.SignedInfo.SignatureMethod = "http://www.w3.org/2000/09/xmldsig#rsa-sha1";

    //digest info

    Reference reference = new Reference();

    reference.Uri = "";

    reference.DigestMethod = "http://www.w3.org/2000/09/xmldsig#sha1";

    firmado.AddReference(reference);

    // with the public key will be added in the signature part. 

    KeyInfo keyInfo = new KeyInfo();

    keyInfo.AddClause(new RSAKeyValue((RSA)cert.PrivateKey));

    keyInfo.AddClause(new KeyInfoX509Data(cert));

    firmado.KeyInfo = keyInfo;

    firmado.ComputeSignature();

    XmlElement xmlDigitalSignature = firmado.GetXml();

    // buscamos el ultimo elemento del documento para agregarle la firma

    XmlElement elemento = (XmlElement)documentXml.SelectSingleNode(@"//datos_complementarios_declaracion_ingreso/representantes[last()]");

    XmlNode parent = elemento.ParentNode;

    parent.InsertAfter(xmlDigitalSignature, elemento);

    string ruta_completa = ruta + rut + " - " + tipo + " - " + fecha + " - N - " + "Complemento Firmado.xml";

    documentXml.Save(ruta_completa);

}

Answer 1

XmlWriterSettings settings = new XmlWriterSettings(); settings.Indent = true; settings.Encoding = new UTF8Encoding(false);string ruta_completa = $"{ruta}{rut} - {tipo} - {fecha} - N - Complemento Firmado.xml"; XmlWriter writer = XmlWriter.Create(ruta_completa, settings); doc.Save(writer);您应该使用XmlTextWriter的实例编写文档，并在其构造函数中传递一个XmlWriterSettings实例，其中您将Encoding属性显式设置为不带 BOM 前导码的UTF8Encoding实例