我如何解决系统参数异常：'The node to insert is from another document context.'

Question

我需要帮助，我有这个代码

public static void Main()
{
XmlDocument doc1 = new XmlDocument();
doc1.Load(XML1);
XmlDocument doc2 = new XmlDocument();
doc2.Load(XML2);
XmlElement root = doc2.DocumentElement;
var children1 = doc1.SelectNodes("root/data");
//var children2 = doc2.SelectNodes("root/data");
XmlDocument result = new XmlDocument();
result.Load(ResultFile);
XmlNodeList Xlist = result.SelectNodes("/root/data");
for (var d = 0; d < children1.Count; d++) //lista  doc 1
{
var child = children1[d];
XmlNode nodeToFind = root.SelectSingleNode("/data[@name='" + child.Attributes["name"].Value + "']");
if (nodeToFind == null)
{
result.AppendChild(child);
}
}

我在这一行得到一个例外：result.AppendChild(child);

该异常是什么意思，我该如何解决它？

Answer 1

将代码更新为 -

public static void Main()
{
XmlDocument doc1 = new XmlDocument();
doc1.Load(XML1);
XmlDocument doc2 = new XmlDocument();
doc2.Load(XML2);
XmlElement root = doc2.DocumentElement;
var children1 = doc1.SelectNodes("root/data");
//var children2 = doc2.SelectNodes("root/data");
XmlDocument result = new XmlDocument();
result.Load(ResultFile);
XmlNode XNode = result.SelectSingleNode("/root");
for (var d = 0; d < children1.Count; d++) //lista  doc 1
{
var child = children1[d];
XmlNode nodeToFind = root.SelectSingleNode("/data[@name='" + child.Attributes["name"].Value + "']");
if (nodeToFind == null)
{
XNode.AppendChild(result.ImportNode(child, true));
}
}
result.Save(ResultFile);
}