XElement element = new XElement("book", new XAttribute("price", "20.00"), new XAttribute("format", "paperback"), new XAttribute("language", "en-US") ); // This will throw an exception, as the "title" attribute is missing element.RequireAttribute("title");
XElement element = new XElement("book", new XAttribute("title", "Jane Eyre"), new XAttribute("author", "Charlotte Bronte"), new XAttribute("publisher", "Penguin Classics") ); // This will not throw an exception, as all required attributes exist element.RequireAttribute("title"); element.RequireAttribute("author"); element.RequireAttribute("publisher");In this example, we create a new XElement "book" with three attributes: "title", "author", and "publisher". We then call the RequireAttribute method three times to check if all attributes exist within the XElement. Since all attributes are present, no exception will be thrown. Both of these examples use the System.Xml.Linq package library in C#.