本文介紹了添加基于帶有 SignedXml 類的 Id 屬性的引用時出現“格式錯誤的引用元素"的處理方法，對大家解決問題具有一定的參考價值，需要的朋友們下面隨著小編來一起學習吧！
問題描述
限時送ChatGPT賬號..
當有命名空間前綴時，無法通過 Id 屬性對元素進行簽名:
Unable to sign element by Id attribute when there's a namespace prefix:
void Main()
{
var doc = new XmlDocument();
doc.LoadXml("<root xmlns:u="myuri"><test u:Id="_0">Zebra</test></root>");
SignedXml signedXml = new SignedXml(doc);
signedXml.SigningKey = new RSACryptoServiceProvider();
Reference reference = new Reference("#_0");
signedXml.AddReference(reference);
signedXml.ComputeSignature();
}
ComputeSignature() 將在此處失敗并出現格式錯誤的參考元素"，該怎么做?
ComputeSignature() will fail here with 'Malformed Reference Element' how should this be done?
推薦答案
我們使用的方法是繼承 System.Security.Cryptography.Xml.SignedXml 類...
The approach we used was to subclass System.Security.Cryptography.Xml.SignedXml class...
public class SignedXmlWithId : SignedXml
{
public SignedXmlWithId(XmlDocument xml) : base(xml)
{
}
public SignedXmlWithId(XmlElement xmlElement)
: base(xmlElement)
{
}
public override XmlElement GetIdElement(XmlDocument doc, string id)
{
// check to see if it's a standard ID reference
XmlElement idElem = base.GetIdElement(doc, id);
if (idElem == null)
{
XmlNamespaceManager nsManager = new XmlNamespaceManager(doc.NameTable);
nsManager.AddNamespace("wsu", "http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-utility-1.0.xsd");
idElem = doc.SelectSingleNode("http://*[@wsu:Id="" + id + ""]", nsManager) as XmlElement;
}
return idElem;
}
}
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