using System;

using System.IO;

using System.Xml;

using System.Xml.Serialization;

​

[Serializable]

public class MyClass

{

    public string Message { get; set; }

}

​

class Program

{

    static void Main()

    {

        XmlDocumentLoadTest(); // fail

        XmlDocumentCreateTest(); // success

        XmlParserTest(); // fail

    }

​

    static void XmlDocumentLoadTest()

    {

        try

        {

            char nonPrintableChar = (char)29;

            string xmlContent = $"<root>{nonPrintableChar}Hello World{nonPrintableChar}</root>";

            XmlDocument xmlDoc = new XmlDocument();

            xmlDoc.LoadXml(xmlContent);

        }

        catch (Exception e)

        {

            Console.WriteLine("XmlDocumentLoadTest :" + e.Message);

        }

    }

​

    static void XmlDocumentCreateTest()

    {

        try

        {

            char nonPrintableChar = (char)29;

            // Create an XmlDocument

            XmlDocument xmlDoc = new XmlDocument();

            // Create the root element

            XmlElement rootElement = xmlDoc.CreateElement("root");

            // Create the message element and set its text content

            XmlElement messageElement = xmlDoc.CreateElement("message");

            messageElement.InnerText = $"{nonPrintableChar}test{nonPrintableChar}";

            // Append the message element to the root element

            rootElement.AppendChild(messageElement);

            // Append the root element to the XmlDocument

            xmlDoc.AppendChild(rootElement);

            Console.WriteLine(xmlDoc.InnerXml);

        }

        catch (Exception e)

        {

            Console.WriteLine("XmlDocumentCreateTest :" + e.Message);

        }

    }

​

    static void XmlParserTest()

    {

        try

        {

            char nonPrintableChar = (char)29;

            MyClass myObject = new MyClass

            {

                Message = $"Hello{nonPrintableChar}World"};

            string xmlContent = SerializeToXml(myObject);

            Console.WriteLine("XmlParser (Content):" + xmlContent);

            MyClass deserializedObject = DeserializeFromXml<MyClass>(xmlContent);

        }

        catch (Exception e)

        {

            Console.WriteLine("XmlParserTest: " + e.Message);

        }

    }

​

    static string SerializeToXml<T>(T obj)

    {

        XmlSerializer serializer = new XmlSerializer(typeof(T));

        using (StringWriter writer = new StringWriter())

        {

            serializer.Serialize(writer, obj);

            return writer.ToString();

        }

    }

​

    static T DeserializeFromXml<T>(string xmlContent)

    {

        XmlSerializer serializer = new XmlSerializer(typeof(T));

        using (StringReader reader = new StringReader(xmlContent))

        {

            return (T)serializer.Deserialize(reader);

        }

    }

}