source: extensions/PiwigoLib/PiwigoWpf/Command/PwgCmdGetImageforTag.cs

using System;
using System.Collections.Generic;
using Com.Piwigo.Lib.IService;
using Com.Piwigo.Wpf.DTO;
using Com.Piwigo.Lib.DTO;
using Com.Piwigo.Wpf.DTO.Helper;
using Com.Piwigo.Wpf.Helper;
using Com.Piwigo.Wpf.Service;

namespace Com.Piwigo.Wpf.Command
{
    public sealed class PwgCmdGetImageforTag : AsyncCommand
    {
        public override string Text { get { return "Get images for a Tag"; } }

        protected override void OnExecute(object parameter)
        {
            PwgTagWPF tagParam;
            Int32 aPage = 0;
            Int32 aPerPage = 0;
            Int32 acount = 0;

            try
            {
                Uri uriServer = new Uri(PwgModelManager.Instance.Session.ServeurName);
                if (parameter is PwgTagWPF)
                {
                    PwgImageListWPF lstImgWPF = PwgModelManager.Instance.ImageList;
                    SendUiInfo("Removing tags...");
                    PwgModelManager.Instance.ImageShown = null;
                    if (lstImgWPF != null)
                    {
                        lstImgWPF.Clear();
                    }

                    tagParam = (PwgTagWPF)parameter;
                    SendUiInfo("Setting up cache data...");
                    ImageCacheManager.Instance.SetCurrentAlbum("Tag-" + tagParam.Name);

                    SendUiInfo("Retriving images list from server...");
                    List<Int32> lstTagId = new List<int>() { tagParam.Id };
                    List<PwgImage> lstImg = PwgServiceProvider.Instance.PwgTagsService.GetListOfImagesFormTags(lstTagId,null,null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, true, ref aPage, ref aPerPage, ref  acount);

                    PwgImageListWPFHelper.ConvertPwgImageListToPwgImageListWPF(lstImg, ref lstImgWPF);
                }
            }
            catch (PwgServiceException ex)
            {
                SendUiInfo("Error " + ex.NumeroErr + " " + ex.MessageErr);
            }
        }
    }
}