lux/TestDevExpress/Services/CustomReportStorageWebExtension.cs

using System;
using Microsoft.AspNetCore.Hosting;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using DevExpress.XtraReports.UI;
using DevExpress.XtraReports.Web.Extensions;
using System.Web;

namespace TestDevExpress.Services
{
    public class CustomReportStorageWebExtension:ReportStorageWebExtension
    {

        public override byte[] GetData(string url)
        {
            string ReportDirectory = "Reports";
            try
            {
                // Parse the string with the report name and parameter values.
                string[] parts = url.Split('?');
                string reportName = parts[0];
                string parametersQueryString = parts.Length > 1 ? parts[1] : String.Empty;

                // Create a report instance.
                XtraReport report = null;

                if (Directory.EnumerateFiles(ReportDirectory).
                    Select(Path.GetFileNameWithoutExtension).Contains(reportName))
                {
                    byte[] reportBytes = File.ReadAllBytes(Path.Combine(ReportDirectory, reportName + "repx"));
                    using (MemoryStream ms = new MemoryStream(reportBytes))
                        report = XtraReport.FromStream(ms);
                }

                if (report != null)
                {
                    // Apply the parameter values to the report.
                    var parameters = HttpUtility.ParseQueryString(parametersQueryString);

                    foreach (string parameterName in parameters.AllKeys)
                    {
                        report.Parameters[parameterName].Value = Convert.ChangeType(
                            parameters.Get(parameterName), report.Parameters[parameterName].Type);
                    }

                    // Disable the Visible property for all report parameters
                    // to hide the Parameters Panel in the viewer.
                    foreach (var parameter in report.Parameters)
                    {
                        parameter.Visible = false;
                    }

                    // If you do not hide the panel, disable the report's RequestParameters property.
                    // report.RequestParameters = false;

                    using (MemoryStream ms = new MemoryStream())
                    {
                        report.SaveLayoutToXml(ms);
                        return ms.ToArray();
                    }
                }
            }
            catch (Exception ex)
            {
                throw new DevExpress.XtraReports.Web.ClientControls.FaultException(
                    "Could not get report data.", ex);
            }
            throw new DevExpress.XtraReports.Web.ClientControls.FaultException(
                string.Format("Could not find report '{0}'.", url));
        }
    }
}