c＃列表内的列表XML Linq

Question

I have the following statement

xdoc.Descendants("Father").Select(p => new
    {
        Son1 = (string)p.Element("Son1").Value,
        Son2 = (string)p.Element("Son2").Value,
        Son3= (string)p.Element("Son3").Value,
        Son4 = (string)p.Element("Son4").Value,
        Son5 = (string)p.Element("Son5").Value

    }).ToList().ForEach(p =>
    {

        Response.Write("Son1= " + p.Son1 + "  ");
        Response.Write("Son2=" + p.Son2 + "  ");
        Response.Write("Son3=" + p.Son3 + "  ");
        Response.Write(("Son4 =") + p.Son4 + "  ");
        Response.Write(("Son5 =") + p.Son5 + "  ");
        Response.Write("<br />");
    });

and it works fine as long as i have only one instance of each son , the problem is that i have multiple instances of Son5, and i don´t know how to put Son5 inside of a list

Here is my XML code Example:

Answer 1

If you have several elements of same type, then you should parse them to list or other collection:

var fathers = from f in xdoc.Descendants("Father")
              select new {
                Son1 = (string)f.Element("Son1"),
                Son2 = (string)f.Element("Son2"),
                Son3= (string)f.Element("Son3"),
                Son4 = (string)f.Element("Son4"),
                Son5 = f.Elements("Son5").Select(s5 => (string)s5).ToList()
             };

Some notes:

• Don't use .Value of XElement or XAttribute - you can cast element itself to appropriate data type without accessing its value. Benefits - less code, more reliable in case element is missing (you will not get NullReferenceException)
• Consider to use int or int? as elemenent values if your elements contain integer values
• If you have single Father element, then don't work with collection of fathers. Just get xml root and check whether it's null or not. After that you can create single father object.

Writing response

foreach(var father in fathers)
{
     Response.Write($"Son1={father.Son1}  ");
     Response.Write($"Son2={father.Son2}  ");
     Response.Write($"Son3={father.Son3}  ");
     Response.Write($"Son4={father.Son4}  ");     
     Response.Write(String.Join("  ", father.Son5.Select(son5 => $"Son5={son5}"));    
     Response.Write("<br />");  
}

Answer 2

Try this:

xdoc.Descendants("Father").Select(p => new
{
    Son1 = p.Element("Son1").Value,
    Son2 = p.Element("Son2").Value,
    Son3= p.Element("Son3").Value,
    Son4 = p.Element("Son4").Value,
    Sons5 = p.Elements("Son5").Select(element => element.Value).ToList()

}).ToList().ForEach(p =>
{

    Response.Write("Son1= " + p.Son1 + "  ");
    Response.Write("Son2=" + p.Son2 + "  ");
    Response.Write("Son3=" + p.Son3 + "  ");
    Response.Write("Son4 =" + p.Son4 + "  ");
    p.Sons5.ForEach(son5 => Response.Write("Son5 =" + son5 + "  "));
    Response.Write("<br />");
});

That will create a list of Son5 within your list of items, which you can iterate in the ForEach with another ForEach .