XmlDocument

<span style="font-family:Microsoft YaHei;font-size:18px;">            StringBuilder str = new StringBuilder();
            
            XmlDocument document = new XmlDocument();
            
            document.Load("List1.xml");
            XmlNodeList nodelist = document.GetElementsByTagName("person");
            foreach (XmlNode item in nodelist)
            {
                str.Append(item.FirstChild.InnerText.ToString());
                str.Append("   ");
            }
            textBox1.Text = str.ToString ();</span>
 

XDocument

<span style="font-family:Microsoft YaHei;font-size:18px;"> XDocument document = XDocument.Load("List1.xml");
            XElement rootElement = document.Root;
            IEnumerable<XElement> ie = rootElement.Descendants("person").Where(x => Convert.ToInt32(x.Attribute("id").Value) > 1);
            foreach (var item in ie)
            {
                textBox1.Text += item.Attribute("id").Value+"\t";
            }</span>