How to mount XML with C#?

Question

I need to build an XML like in the following example:

<?xml version="1.0" encoding="utf-8"?> 
<MeuXML>
   <Clientes>  
        <Cliente-1>Dados Cliente-1</Cliente>  
   </Clientes> 
   <Sistemas>   
        <Sistema-1>
            <Pasta>Pasta do Sistema-1</Pasta>
            <Origem>Origem do Sistema-1</Fontes>    
        </Sistema-1>
   </Sistemas>
</MeuXMl>

I can even assemble an empty initial XML, but when I add a new client for example (like Client-1), my code duplicates the Clients tag. The same thing happens with systems. I’m doing it this way with systems (example of System-1):

 XElement xml = XElement.Load("Config.xml")
 XElement xmlSistemas = XElement.Load("Config.xml").Elements("Sistemas").FirstOrDefault();
 XElement xSistema1 = new XElement("Sistema-1");
 XElement xPasta = new XElement("Pasta");
 xPasta.Value = "Pasta do Sistema-1";
 XElement xOrigem = new XElement("Origem");
 xOrigem.Value = "Origem do Sistema-1";
 xSistema1.Add(xPasta, xOrigem);
 xmlSistemas.Add(xSistema1);
 xml.Add(xmlSistemas);
 xml.Save("Config.xml");

How can I fix this? Thank you!

Answer 1

You are adding the tag <Sistemas> (and your children) that you created in the xml file (tag Meuxml), which already has a tag Sistemas - then you get two. What you need to do is add the new system (xSistema1) tag Sistemas that already exists in the file. The code below shows how this can be done.

class Program
{
    const string XML = @"<?xml version=""1.0"" encoding=""utf-8""?> 
<MeuXML>
   <Clientes>  
        <Cliente-1>Dados Cliente-1</Cliente-1>  
   </Clientes> 
   <Sistemas>   
        <Sistema-1>
            <Pasta>Pasta do Sistema-1</Pasta>
            <Origem>Origem do Sistema-1</Origem>    
        </Sistema-1>
   </Sistemas>
</MeuXML>";

    static void Main(string[] args)
    {
        XElement xml = XElement.Parse(XML);
        XElement xmlSistemas = xml.Elements("Sistemas").FirstOrDefault();
        XElement xSistema2 = new XElement("Sistema-2");
        XElement xPasta = new XElement("Pasta");
        xPasta.Value = "Pasta do Sistema-2";
        XElement xOrigem = new XElement("Origem");
        xOrigem.Value = "Origem do Sistema-2";
        xSistema2.Add(xPasta, xOrigem);
        xmlSistemas.Add(xSistema2);
        Console.WriteLine(xml);
    }
}