C# 5.0 Programmer's Reference

718 ❘ APPENDIX A Solutions to Exercises
Find Name elements that have parents that are Plant elements, and the Plant has a Zone
child with the value 1.
With this new query, the program needs to loop through the selected Name elements and
display their values. The previous query required the program to start at Plant elements
and find their Name elements. (Both versions of the query are in the example program, so
you can experiment with them.)
When the user selects a plant from the ListBox, the program uses the following code to
display information about the plant.
// Display this plant's details.
private void plantsListBox_SelectedIndexChanged(object sender, EventArgs e)
{
// Get the selected name.
string plantName = plantsListBox.SelectedItem.ToString();
// Find the Plant with a Name child that has this value.
string query = "//Plant[Name=\"" + plantName + "\"]";
XElement plant = Document.XPathSelectElement(query);
}
// Display the Plant element's data.
detailsTextBox.Text = plant.ToString();
This code composes a query similar to the following.
//Plant[Name="id euismod pulvinar"]
It then calls XPathSelectElement to select the first Plant element with the selected name.
The code then displays that element’s data.
6. The TransformPlants example program does this. The following code shows the XSLT file.
Name
Zone
Light
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