C#

class Program
{
    class Foo
    {
        static int abc;
        int bcd;
    }

    static void Main(string[] args)
    {
        Foo f = new Foo();
        FieldInfo[] fields = f.GetType().GetFields(BindingFlags.Instance);

        return;
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Reflection;

namespace TestReflection1
{
    class Program
    {
        class Foo
        {
            public static int abc;
            public int bcd;
        }
        
        static void Main(string[] args)
        {
            Foo f = new Foo();
            FieldInfo[] fields = f.GetType().GetFields(BindingFlags.Instance | BindingFlags.Public);

            return;
        }
    }
}

George_George wrote:

But why using Instance tag alone is not working?

If the requested filed [sic] is non-public and the caller does not have ReflectionPermission to reflect non-public objects outside the current assembly, this method returns nullNothingnullptra null reference (Nothing in Visual Basic).

Scott Dorman wrote:

have ReflectionPermission to reflect non-public objects

George_George wrote:

Means using BindingFlags.NonPublic to grant permission?

George_George wrote:

I am confused what means "outside the current assembly" and why it applies to my situaion, since I am always using the same assembly -- the current.

George_George wrote:

By just specifying BindingFlags.Instance you are effectively saying get me any instance field that is neither public nor non-public" -- where do you find this point? From MSDN I can not find out. Could you post a link about where you find the statemen please? I want to learn more.

George_George wrote:

I think CAS does not apply to my sample, and also "Outside the current assembly" also does not applies to my sample. Correct?

George_George wrote:

What members are neither public nor non-public? Interested to know.

Scott Dorman wrote:

There really isn't a direct link for this. It comes from reading the MSDN documentation (more correctly, reading "between the lines") and experience.

George_George wrote:

Could you post the link please so that I can also have a learn?

George_George wrote:

Could I understand "internal" is used to restrict access only to the current assembly (e.g. other assembly can not reference this "internal" type)?

George_George wrote:

what means "overridden in a derived class"

George_George wrote:

"defined for the current Type".