ReportStorageWebExtension.cs

using System.Collections.Generic;
using DevExpress.XtraReports.Web.Extensions;
using DevExpress.XtraReports.UI;
using System.ServiceModel;
using System.IO;
using System;
using System.Linq;

namespace MvcWizardCustomization
{
    public class ReportStorageWebExtension1 : DevExpress.XtraReports.Web.Extensions.ReportStorageWebExtension
    {
        readonly string reportDirectory;
        const string FileExtension = ".repx";
        public ReportStorageWebExtension1(string reportDirectory) {
            this.reportDirectory = reportDirectory;
        }

        public override bool CanSetData(string url) {
            // Determines whether or not it is possible to store a report by a given URL. 
            // For instance, make the CanSetData method return false for reports that should be read-only in your storage. 
            // This method is called only for valid URLs (i.e., if the IsValidUrl method returned true) before the SetData method is called.

            return true;
        }

        public override bool IsValidUrl(string url) {
            // Determines whether or not the URL passed to the current Report Storage is valid. 
            // For instance, implement your own logic to prohibit URLs that contain white spaces or some other special characters. 
            // This method is called before the CanSetData and GetData methods.

            return true;
        }

        public override byte[] GetData(string url) {
            // Returns report layout data stored in a Report Storage using the specified URL. 
            // This method is called only for valid URLs after the IsValidUrl method is called.
            try {
                return File.ReadAllBytes(Path.Combine(reportDirectory, url + FileExtension));
            } catch (Exception) {
                throw new FaultException(new FaultReason(string.Format("Could not find report '{0}'.", url)), new FaultCode("Server"), "GetData");
            }
        }

        public override Dictionary<string, string> GetUrls() {
            // Returns a dictionary of the existing report URLs and display names. 
            // This method is called when running the Report Designer, 
            // before the Open Report and Save Report dialogs are shown and after a new report is saved to a storage.

            return Directory.GetFiles(reportDirectory, "*" + FileExtension)
                                     .Select(Path.GetFileNameWithoutExtension)
                                     .ToDictionary<string, string>(x => x);
        }

        public override void SetData(XtraReport report, string url) {
            // Stores the specified report to a Report Storage using the specified URL. 
            // This method is called only after the IsValidUrl and CanSetData methods are called.
            report.SaveLayoutToXml(Path.Combine(reportDirectory, url + FileExtension));
        }

        public override string SetNewData(XtraReport report, string defaultUrl) {
            // Stores the specified report using a new URL. 
            // The IsValidUrl and CanSetData methods are never called before this method. 
            // You can validate and correct the specified URL directly in the SetNewData method implementation 
            // and return the resulting URL used to save a report in your storage.
            SetData(report, defaultUrl);
            return defaultUrl;
        }
    }
}