如何使用C＃在XML中使用元素属性值获取子节点

Question

i am trying to get all the child nodes using attribute class. My code is

string xmlText = File.ReadAllText(@"G:\\car_words_xml.xml");
var doc = new XmlDocument();
doc.LoadXml(xmlText);
var result = doc.SelectNodes("//*[@class='سوزوکی']");           
foreach (XmlNode node in result)
{
foreach (XmlNode childNode in node.ChildNodes)
{
textBox1.Text= textBox1.Text+ Environment.NewLine+childNode.InnerText;
}
} 

in this code i have given value for class attribute. what if i want to use a variable say x instead of value so tht output of this code depends on tht varaible value.

Answer 1

You can use a string variable and concatenate the variable with the XPath expression like below

string x = ...; // set the value here
var result = doc.SelectNodes("//*[@class='" + x + "']");           
foreach (XmlNode node in result)
{
    foreach (XmlNode childNode in node.ChildNodes)
    {
        textBox1.Text= textBox1.Text+ Environment.NewLine+childNode.InnerText;
    }
} 

Answer 2

Alternatively, you can use String.Format() to stuff dynamic substring value into the XPath string. This, IMHO, is better to avoid problems such as missing single quotes (single quote directly before/after double quote is rather hard to read and you may not notice when it is missing) :

var x = "سوزوکی";
var xpath = String.Format("//*[@class='{0}']", x);
var result = doc.SelectNodes(xpath);