Revit二次开发示例：HelloRevit

#region Namespaces
using System;
using System.Collections.Generic;
using System.Diagnostics;
using Autodesk.Revit.ApplicationServices;
using Autodesk.Revit.Attributes;
using Autodesk.Revit.DB;
using Autodesk.Revit.UI;
using Autodesk.Revit.UI.Selection;
#endregion

namespace HelloRevit
{
[Autodesk.Revit.Attributes.Transaction(TransactionMode.Manual)]
[Autodesk.Revit.Attributes.Regeneration(RegenerationOption.Manual)]
[Autodesk.Revit.Attributes.Journaling(JournalingMode.NoCommandData)]
public class Command : IExternalCommand
{
public Result Execute(
ExternalCommandData commandData,
ref string message,
ElementSet elements)
{
Application app = commandData.Application.Application;
Document activeDoc = commandData.Application.ActiveUIDocument.Document;
TaskDialog mainDialog = new TaskDialog("Hello, Revit!");
mainDialog.MainInstruction = "Hello, Revit!";
mainDialog.MainContent=
"This sample shows how a basic ExternalCommand can be added to the Revit user interface."
+ " It uses a Revit task dialog to communicate information to the interactive user.\n"
+ "The command links below open additional task dialogs with more information.";

mainDialog.AddCommandLink(TaskDialogCommandLinkId.CommandLink1,
"View information about the Revit installation");
mainDialog.AddCommandLink(TaskDialogCommandLinkId.CommandLink2,
"View information about the active document");

mainDialog.CommonButtons = TaskDialogCommonButtons.Close;
mainDialog.DefaultButton = TaskDialogResult.Close;
mainDialog.FooterText=
"<a href=\"http://usa.autodesk.com/adsk/servlet/index?siteID=123112&id=2484975 \">"
+ "Click here for the Revit API Developer Center</a>";

TaskDialogResult tResult = mainDialog.Show();
if (TaskDialogResult.CommandLink1 == tResult)
{
TaskDialog dialog_CommandLink1 = new TaskDialog("Revit Build Informaiton");
dialog_CommandLink1.MainInstruction =
"Revit Version Name is: " + app.VersionName + "\n"
+ "Revit Version Number is: " + app.VersionNumber + "\n"
+ "Revit Version Build is: " + app.VersionBuild;
dialog_CommandLink1.Show();
}
else if (TaskDialogResult.CommandLink2 == tResult)
{
TaskDialog.Show("Active Document Information",
"Active document: " + activeDoc.Title + "\n"
+ "Active view name: " + activeDoc.ActiveView.Name);
}

return Result.Succeeded;
}
}
}