How can I add a new attribute to an existing xml node using wpf and c#?

Question

I'm trying to add a new attribute to an existing xml node, my xml looks like this:

<Atletas>
<Atleta Id="0" Nombre="TextBox4" Genero="Masculino" Edad="TextBox"  />
<Atleta Id="1" Nombre="TextBox345" Genero="Masculino" Edad="TextBox" />
<Atleta Id="2" Nombre="Daniel1" Genero="Masculino" Edad="TextBox"  />
<Atleta Id="3" Nombre="TextBox4" Genero="Masculino" Edad="TextBox" />
<Atleta Id="4" Nombre="Daniel2" Genero="Masculino" Edad="23" />
<Atleta Id="5" Nombre="Juan" Genero="Masculino" Edad="25" />
</Atletas>

I want my xml looks like this:

<Atletas>
<Atleta Id="0" Nombre="Daniel" Genero="Masculino" Edad="25" Peso="89" />
<Atleta Id="1" Nombre="John" Genero="Masculino" Edad="22"  />
<Atleta Id="2" Nombre="Tom" Genero="Masculino" Edad="21" Peso="78"/>
<Atleta Id="3" Nombre="Kerry" Genero="Masculino" Edad="18" />
<Atleta Id="4" Nombre="Peter" Genero="Masculino" Edad="23" Peso="76" />
<Atleta Id="5" Nombre="Juan" Genero="Masculino" Edad="25" />
</Atletas>

Using linq, how can i write a query in order to add a new attribute to a selected node using its Id as an identifier?

Sergey Berezovskiy · Accepted Answer · 2014-05-20 22:22:45Z

2

Use XElement.Add method to add content (like attributes) to elements:

var xdoc = XDocument.Load(path_to_xml);

var atleta = xdoc.Root.Elements("Atleta")
                 .FirstOrDefault(a => (int)a.Attribute("Id") == 3);

atleta.SetAttributeValue("Edad", 21);
atleta.Add(new XAttribute("Peso", 78));
xdoc.Save(path_to_xml);

After executing this code Atleta element with attribute Id equal to 3 will look like:

<Atleta Id="3" Nombre="TextBox4" Genero="Masculino" Edad="21" Peso="78"/>

Suggested reading: Programming Guide (LINQ to XML). If you have any questions to code above or other tasks you need to complete, then just read this guide.

edited May 20, 2014 at 22:22

answered May 20, 2014 at 22:17

Sergey Berezovskiy

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