// C# Extension Method

// Doc: https://csharp-extension.com/en/method/1002562/object-getvalueordefault

​

// @nuget: Z.ExtensionMethods

​

using System;

using System.Xml;           

public class Program

{

    public static void Main()

    {

        var xml = new XmlDocument();

​

        // C# Extension Method: Object - GetValueOrDefault

        Console.WriteLine(xml.GetValueOrDefault(x => x.FirstChild.InnerXml, "FizzBuzz")); // return "FizzBuzz";

        Console.WriteLine(xml.GetValueOrDefault(x => x.FirstChild.InnerXml, () => "FizzBuzz")); // return "FizzBuzz"

    }

}