Question

I’d like to list all method names from the underlyingtype.

I tried

var methods = this.GetType().UnderlyingSystemType.GetMethods();

but doesn’t work.

EDIT

Added example

public class BaseClass
{
   public BaseClass()
   {
         var methods = this.GetType().UnderlyingSystemType.GetMethods();
   }
}

public class Class1:BaseClass
{
   public void Method1()
   {}

   public void Method2()
   {}
}

I need in the collection Method1 and Method 2.

Answer 1

The code you provided works.

System.Exception test = new Exception();
var methods = test.GetType().UnderlyingSystemType.GetMethods();

foreach (var t in methods)
{
    Console.WriteLine(t.Name);
}

returns

get_Message
get_Data
GetBaseException
get_InnerException
get_TargetSite
get_StackTrace
get_HelpLink
set_HelpLink
get_Source
set_Source
ToString
GetObjectData
GetType
Equals
GetHashCode
GetType

EDIT:

Is that what you want?

Class1 class1 = new Class1();
var methodsClass1 = class1.GetType().GetMethods(System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.Instance);

BaseClass baseClass = new BaseClass();
var methodsBaseClass = baseClass.GetType().GetMethods(System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.Instance);

foreach (var t in methodsClass1.Where(z => methodsBaseClass.FirstOrDefault(y => y.Name == z.Name) == null))
{
    Console.WriteLine(t.Name);
}