http://kmlinux.fjfi.cvut.cz/~culikzde/pw/Components03.zip

using System;
using System.Collections.Generic;
// using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
 
using System.Reflection;
using System.ComponentModel;
 
namespace Components
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
 
        private void RunButton_Click(object sender, EventArgs e)
        {
            displayTree(this);
        }
 
        [Description("Zobraz strom")]
        public void displayTree (Control obj)
        {
            tree.Nodes.Clear ();
            displayBranch (tree.Nodes, obj);
        }
 
        private void displayBranch (TreeNodeCollection branch, Control obj)
        {
            TreeNode item = new TreeNode ();
            item.Text = obj.ToString();
            item.Tag = obj;
            branch.Add(item);
            foreach (Control c in obj.Controls)
               displayBranch (item.Nodes, c);
        }
 
        // using System.ComponentModel;
        [Description("Pozdrav")]
        public string hello ()
        {
            return "Ahoj";
        }
 
        [Description("Secti dve cisla")]
        public int add ( int a, int b)
        {
            return a+b;
        }
 
        // using System.ComponentModel;
        [Description ("Vytiskni radku") ]
        public void put (string s)
        {
            info.AppendText(s + "\r\n");
        }
 
        private void Tree_NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e)
        {
            object obj = e.Node.Tag;
            prop.SelectedObject = obj;
 
            info.Text = "";
 
            Type t = obj.GetType();
            put("Type " + t.FullName);
 
            MethodInfo[] mm = t.GetMethods();
            foreach (MethodInfo m in mm)
            {
                DescriptionAttribute a = m.GetCustomAttribute <DescriptionAttribute> ();
                if (a != null)
                {
                    string s = "";
                    ParameterInfo[] args = m.GetParameters();
                    if (args.Length == 0)
                    {
                        object [] param = { };
                        object result = m.Invoke (obj, param);
                        s = result.ToString();
                    }
                    else if (args.Length == 2)
                    {
                        ParameterInfo p0 = args[0];
                        ParameterInfo p1 = args[1];
                        if (p0.ParameterType == typeof(Int32) &&
                            p1.ParameterType == typeof(Int32))
                        {
                            object[] param = { 1, 7 };
                            object result = m.Invoke(obj, param);
                            s = "(" + p0.Name + "=" + param[0].ToString() + ",";
                            s = s  + p1.Name + "=" + param[1].ToString() + ")";
                            s = s + " -> " + result.ToString();
                        }
                    }
                    put("Method " + m.Name + " ... " + a.Description + " ... " + s);
                }
            }
 
            // using System.Reflection;
            /*
            PropertyInfo[] p = t.GetProperties();
            foreach (PropertyInfo v in p)
            {
                object value = v.GetValue(obj);
                string text = "";
                if (value != null)
                    text = value.ToString();
                put("Property " + v.Name + " = " + text);
            }
            */
 
            /*
            foreach (CustomAttributeData a in v.CustomAttributes)
            {
                put("Attribute " + v.Name + " . " + a.ToString ());
            }
            */
        }
 
        private TreeNode currentNode = null;
 
        private void Tree_MouseClick(object sender, MouseEventArgs e)
        {
            currentNode = tree.GetNodeAt(e.X, e.Y);
        }
 
        private void ContextMenu_Opening(object sender, CancelEventArgs e)
        {
            contextMenu.Items.Clear();
            if (currentNode != null)
            {
                object obj = currentNode.Tag;
                contextMenu.Items.Add("opening " + obj.ToString());
 
                Type t = obj.GetType();
                MethodInfo[] methods = t.GetMethods();
                foreach (MethodInfo m in methods)
                {
                    DescriptionAttribute a = m.GetCustomAttribute<DescriptionAttribute>();
                    if (a != null)
                    {
                        string s = "";
                        ParameterInfo[] args = m.GetParameters();
                        if (args.Length == 0)
                        {
                            MyMenuItem item = new MyMenuItem ();
                            item.Text = m.Name + " ... " + a.Description;
                            item.obj = obj;
                            item.m = m;
                            item.Click += ContextMenuClick;
                            contextMenu.Items.Add(item);
                        }
                    }
                }
            }
        }
        private void ContextMenuClick(object sender, EventArgs e)
        {
            MyMenuItem item = sender as MyMenuItem;
            object result = item.m.Invoke(item.obj, new object[] { });
            put("MENU CLICK ... " + result.ToString());
        }
    }
 
    class MyMenuItem : ToolStripMenuItem
    {
        public object obj;
        public MethodInfo m;
 
    };
}