Testing and navigating inheritance C# with Example

interface BaseInterface {} 
class BaseClass : BaseInterface {} 
interface DerivedInterface {} 
class DerivedClass : BaseClass, DerivedInterface {} 
var baseInterfaceType = typeof(BaseInterface); 
var derivedInterfaceType = typeof(DerivedInterface); 
var baseType = typeof(BaseClass); 
var derivedType = typeof(DerivedClass); 
var baseInstance = new BaseClass(); 
var derivedInstance = new DerivedClass(); 
Console.WriteLine(derivedInstance is DerivedClass); //True 
Console.WriteLine(derivedInstance is DerivedInterface); //True 
Console.WriteLine(derivedInstance is BaseClass); //True 
Console.WriteLine(derivedInstance is BaseInterface); //True 
Console.WriteLine(derivedInstance is object); //True 
Console.WriteLine(derivedType.BaseType.Name); //BaseClass 
Console.WriteLine(baseType.BaseType.Name); //Object 
Console.WriteLine(typeof(object).BaseType); //null 
Console.WriteLine(baseType.IsInstanceOfType(derivedInstance)); //True 
Console.WriteLine(derivedType.IsInstanceOfType(baseInstance)); //False 
Console.WriteLine( 
string.Join(",", 
derivedType.GetInterfaces().Select(t => t.Name).ToArray())); 
//BaseInterface,DerivedInterface 
Console.WriteLine(baseInterfaceType.IsAssignableFrom(derivedType)); //True 
Console.WriteLine(derivedInterfaceType.IsAssignableFrom(derivedType)); //True 
Console.WriteLine(derivedInterfaceType.IsAssignableFrom(baseType)); //False