Commands

using Autodesk.Revit.UI;
using Autodesk.Revit.Attributes;
using System.Windows.Forms;
 
namespace RevitAPIRibbonCommand
{
    [Transaction(TransactionMode.Manual)]
    public class MyCommand : IExternalCommand
    {
        public Result Execute(
            ExternalCommandData commandData,
            ref string message,
            ElementSet elements)
        {
            // Your command logic here
            TaskDialog.Show("Hello Revit", "Your custom command executed!");
 
            return Result.Succeeded;
        }
    }
}

using Autodesk.Revit.UI;
using Autodesk.Revit.Attributes;
 
namespace RevitAPIRibbonCommand
{
    public class RibbonSetup : IExternalApplication
    {
        public Result OnStartup(UIControlledApplication application)
        {
            // Create a ribbon panel
            RibbonPanel ribbonPanel = application.CreateRibbonPanel("Custom Tools");
 
            // Create a push button
            PushButtonData buttonData = new PushButtonData(
                "MyCommand", "Execute Command",
                System.Reflection.Assembly.GetExecutingAssembly().Location,
                "RevitAPIRibbonCommand.MyCommand");
 
            PushButton button = ribbonPanel.AddItem(buttonData) as PushButton;
 
            // Add a tooltip
            button.ToolTip = "Click to execute your custom command.";
 
            return Result.Succeeded;
        }
 
        public Result OnShutdown(UIControlledApplication application)
        {
            return Result.Succeeded;
        }
    }
}