CopyPage.cs

namespace Helix.Skeleton.Foundation.EditorExtensions.Commands
{
    using System.Collections.Specialized;
    using System.Linq;
    using System.Web.Mvc;
    using Helix.Skeleton.Foundation.EditorExtensions.Consts.CopyPage;
    using Helix.Skeleton.Foundation.EditorExtensions.Services;
    using Sitecore;
    using Sitecore.Data.Items;
    using Sitecore.Shell.Framework.Commands;
    using Sitecore.Shell.Framework.Pipelines;

    public class CopyPage : Command
    {
        private const string CopyPagePipelineName = "skeletonUiCopyPage";

        private readonly ICopyPageService duplicatePageService;

        public CopyPage()
        {
            this.duplicatePageService = DependencyResolver.Current.GetService<ICopyPageService>();
        }

        public override void Execute(CommandContext context)
        {
            NameValueCollection parameters = new NameValueCollection
            {
                { ParameterKeys.DatabaseKey, context.Items.First().Database.Name },
                { ParameterKeys.ItemsKey, string.Join("|", context.Items.Select(i => i.ID)) },
                { ParameterKeys.LanguageKey, context.Items.First().Language.Name }
            };

            Context.ClientPage.Start(CopyPagePipelineName, new CopyItemsArgs { Parameters = parameters });
        }

        public override CommandState QueryState(CommandContext context)
        {
            var currentItem = this.GetCurrentItem(context);
            if (currentItem == null)
            {
                return CommandState.Disabled;
            }

            var contentFolder = this.duplicatePageService.GetContentFolder(currentItem.Paths.FullPath, currentItem.Database.Name);
            if (contentFolder == null)
            {
                return CommandState.Disabled;
            }

            return base.QueryState(context);
        }

        private Item GetCurrentItem(CommandContext context)
        {
            if (context.Items == null || context.Items.Count() != 1)
            {
                return null;
            }

            return context.Items.First();
        }
    }
}