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How to: Switch Dashboards by Clicking Thumbnails Displayed in Image Slider in the ASP.NET Web Forms Dashboard Control

  • 5 min to read

This example demonstrates how to load dashboards with the ASPxClientDashboard.LoadDashboard method on an image click in the ASPxImageSlider control. The ASPxDashboardExporter class is used to create dashboard images.

using DevExpress.DashboardCommon;
using DevExpress.DashboardWeb;
using DevExpress.DashboardWeb.Native;
using DevExpress.Web;
using System;
using System.Collections.Generic;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Web;
using System.Web.Script.Serialization;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Xml.Linq;

namespace WebApplication18 {
    public partial class Default : System.Web.UI.Page {
        string dashboardsPath = @"~/App_Data/Dashboards";
        string thumbnailsPath = @"~/Thumbnails";


        protected void Page_Load(object sender, EventArgs e) {
            DashboardFileStorage storage = new DashboardFileStorage(dashboardsPath);
            ASPxDashboard1.SetDashboardStorage(storage);
            DataSourceInMemoryStorage dataSourceStorage = new DataSourceInMemoryStorage();
            dataSourceStorage.RegisterDataSource(DataSourceGenerator.CreateNWindDataSource().SaveToXml());
            ASPxDashboard1.SetDataSourceStorage(dataSourceStorage);
        }

        protected void ImageSlider_ItemDataBound(object source, ImageSliderItemEventArgs e) {
            e.Item.Name = System.IO.Path.GetFileNameWithoutExtension(e.Item.ImageUrl);
        }

        protected void ASPxDashboard1_DataLoading(object sender, DataLoadingWebEventArgs e) {
            DashboardMainDemo.DataLoader.LoadData(e);
        }

        protected void ASPxCallbackPanel1_Callback(object sender, CallbackEventArgsBase e) {
            DashboardFileStorage storage = new DashboardFileStorage(dashboardsPath);
            var dashboards = (storage as IDashboardStorage).GetAvailableDashboardsInfo().ToList();

            ASPxDashboardExporter exporter = new ASPxDashboardExporter(ASPxDashboard1);
            string path = Server.MapPath(thumbnailsPath);

            DirectoryInfo di = new DirectoryInfo(path);
            foreach (FileInfo file in di.GetFiles()) {
                file.Delete();
            }

            for (int i = 0; i < dashboards.Count; i++) {
                string fullPath = string.Format(@"{0}\{1}.png", path, dashboards[i].ID);
                using (FileStream fs = new FileStream(fullPath, FileMode.OpenOrCreate, FileAccess.Write))
                    exporter.ExportToImage(dashboards[i].ID, fs, new Size(1000, 1000), null, new DashboardImageExportOptions() {
                        Format = DevExpress.DashboardCommon.DashboardExportImageFormat.Png
                    });
            }

            ImageSlider.ImageSourceFolder = thumbnailsPath;
        }
    }
}