Revit二次开发之一 Hello TaskDialog

Revit中显示，如下对话框，

using System;
using System.Collections.Generic;
using System.Text;
using Autodesk.Revit;
using Autodesk.Revit.DB;
using Autodesk.Revit.UI;
using Autodesk.Revit.ApplicationServices;

namespace Revit.SDK.Samples.HelloRevit.CS
{
    public class Command : IExternalCommand
    {

        public Autodesk.Revit.UI.Result Execute(ExternalCommandData commandData,
            ref string message, Autodesk.Revit.DB.ElementSet elements)
        {
          
            Application app = commandData.Application.Application;
            Document activeDoc = commandData.Application.ActiveUIDocument.Document;
            //创建一个对话框
            TaskDialog mainDialog = new TaskDialog("你好, Revit!");
            //显示标题
            mainDialog.MainInstruction = "你好, Revit!";
            //显示对话框的内容
            mainDialog.MainContent ="这是一个对话框的案例";
            //在对话框中添加链接，总共可以添加5个
            mainDialog.AddCommandLink(TaskDialogCommandLinkId.CommandLink1,
                                      "链接1");
            mainDialog.AddCommandLink(TaskDialogCommandLinkId.CommandLink2,
                                      "链接2");
            // 设置显示的按钮
            mainDialog.CommonButtons = TaskDialogCommonButtons.Close;
            mainDialog.DefaultButton = TaskDialogResult.Close;

            //底部显示的文字，可以是HTML
            mainDialog.FooterText =
                "<a href=\"http://usa.autodesk.com/adsk/servlet/index?siteID=123112&id=2484975 \">"
                + "进入revit开发中心</a>";

            TaskDialogResult tResult = mainDialog.Show();

            //判断用户点击的按钮
            if (TaskDialogResult.CommandLink1 == tResult)
            {
                TaskDialog dialog_CommandLink1 = new TaskDialog("链接1被点击");
                dialog_CommandLink1.MainInstruction = "链接1";
                dialog_CommandLink1.Show();

            }

            else if (TaskDialogResult.CommandLink2 == tResult)
            {
                TaskDialog.Show("链接2被点击", "链接2");
            }
  

            return Autodesk.Revit.UI.Result.Succeeded;
        }


    }
}