HelloNppPlugin-Archive/HelloNppPlugin/Main.cs

using Kbg.NppPluginNET.PluginInfrastructure;
using System;
using System.Windows.Forms;

namespace HelloNppPlugin
{
    public class Main
    {
        public const string PluginName = nameof(HelloNppPlugin);

        public static void CommandMenuInit()
        {
            PluginBase.SetCommand(0, "Say hello", SayHi);
        }

        private static void SayHi()
        {
            MessageBox.Show("Hello NppPlugin by C#!");
        }

        public static void SetToolBarIcon()
        {
        }

        public static void PluginCleanUp()
        {
        }

        public static void OnNotification(ScNotification notification)
        {
        }
    }

    internal class Win32Window : IWin32Window
    {
        public IntPtr Handle { get; }

        public Win32Window(IntPtr handle)
        {
            Handle = handle;
        }
    }
}