将对象序列化为 XML 并将其附加到 XML 文件

Question

我正在尝试将（马）对象转换为 XmlElement，以便我可以将其附加到 XML 文件。这是我最近尝试过的。

        // create writer and serializer to add horse to xml
        var stringwriter = new StringWriter();
        var serializer = new XmlSerializer(horse.GetType());

        // serialize horse object to xml 
        serializer.Serialize(stringwriter, horse);
        var xmlStr = stringwriter.ToString();

        // format string to xml 
        var horseXml = new XmlDocument();
        horseXml.LoadXml(xmlStr);

        // get horse element from horseXml
        var horseEl = horseXml.ChildNodes[0];

        // assign xmldb to xml document
        var xmlDb = new XmlDocument();
        xmlDb.Load(xmlDbFilepath);
        XmlNode root = xmlDb.DocumentElement;

       // add horseEl to root of xmlDb
        root.AppendChild(horseEl);
        xmlDb.Save(xmlDbFilepath);

不幸的是，一旦我到达行 root.AppendChild(horseEl)，就会抛出以下异常："An exception of type 'System.ArgumentException' occurred in System.Xml.dll but was not handled in user code Additional information: The node to be inserted is from a different document context."

如有任何建议，我们将不胜感激！

编辑：这是 link 显示 my horse class and xmldb。

Answer 1

试试这个。如果数据和 class 结构正确，应该可以工作。

// same code till this

// get horse element from horseXml
XmlElement horseEl = horseXml.DocumentElement; //[1] get the doc element

// assign xmldb to xml document
var xmlDb = new XmlDocument();
xmlDb.Load(xmlDbFilepath);
//XmlNode root = xmlDb.DocumentElement; [2] removed

// add horseEl to root of xmlDb
//var newRoot = root.AppendChild(clonedHorseEl); [3] removed
var xe = xmlDb.CreateElement("Horse"); //[4] Create new Horse element on xmlDb
xe.InnerXml = horseEl.InnerXml; //[5] copy horseEl content
xmlDb.DocumentElement.AppendChild(xe);

xmlDb.Save(xmlDbFilepath);

评论中提到了更改。

将对象序列化为 XML 并将其附加到 XML 文件

Serializing an object to XML and appending it to XML file

c#

xml

asp.net

xml-serialization