遍历XDocument并获取子节点的值

Question

Here's what my XML file looks like.

<PictureBoxes>
  <P14040105>
    <SizeWidth>100</SizeWidth>
    <SizeHeight>114</SizeHeight>
    <locationX>235</locationX>
    <locationY>141</locationY>
  </P14040105>
  <P13100105>
    <SizeWidth>100</SizeWidth>
    <SizeHeight>114</SizeHeight>
    <locationX>580</locationX>
    <locationY>274</locationY>
  </P13100105>
</PictureBoxes>

What I'm actually trying to do is loop through each control in my form and save the Size and Location property on an XML file. The <P... > Node is actually the name of my picturebox and I need to use that name as well.

After creating the XML, I want to try creating the picture boxes on the form again using the XML file. So what I need is get the name of the <P...> node and the values of the child nodes.

Answer 1

You need to look at the FormLoad and FormClosing methods to load and respectively save data from/into the xml file.

In your FormLoad method loop through the child elements of PictureBoxes element and for each element create a PictureBox and set it's values from the xml data as shown below:

protected override OnLoad(EventArgs e)
{
    base.OnLoad(e);

    var doc = XDocument.Load("path/to/xml/file");
    foreach(var element in doc.Descendant("PictureBoxes").Elements())
    {
        var pb = new PictureBox();
        pb.Name = element.Name.LocalName;
        pb.Size.Width = Convert.ToInt32(element.Element("SizeWidth").Value));
        // other properties here
        this.Controls.Add(pb);
    }
}

And in FormClosing do the reverse thing - iterate over picture boxes and save the properties in xml:

protected override void OnFormClosing(FormClosingEventArgs e)
{
    base.OnFormClosing(e);

    var doc = new XDocument();
    doc.Add(new XElement("PictureBoxes", 
        this.Controls.Where(c => c.GetType() == typeof(PictureBox))
            .Select(pb => new XElement(pb.Name,
                new XElement("SizeWidth", pb.Size.Width),
                new XElement("location", pb.Location.X)))));
    doc.Save("path/to/xml/file");
}