Download report file which is to be generated in to client side

Question

I am using the below code to create and download a Telerik report.

var reportName = "../api/Templates/Invoice.trdp";
var reportProcessor = new Telerik.Reporting.Processing.ReportProcessor();
var reportSource = new Telerik.Reporting.UriReportSource()
{
 Uri = reportName
};
reportSource.Parameters.Add("ID", 3);
reportSource.Parameters.Add("Username", "demouser");
var deviceInfo = new System.Collections.Hashtable()
{
 {"DocumentTitle", "Annual Report" }
};
var result = reportProcessor.RenderReport("PDF", reportSource, deviceInfo);
if (!result.HasErrors)
{
 System.IO.File.WriteAllBytes(System.IO.Path.ChangeExtension(reportName, "pdf"), result.DocumentBytes);
}
}

Once I host it in a server, it creates the file in the server side. How can I download it into the client machine without creating any files in the server.

Answer 1

I was able to do it by returning the file back to the client using the return type HttpResponseMessage

public HttpResponseMessage GenerateOrderReport(int orderID)
    {
        var reportName = ConfigurationManager.AppSettings["EmailAttachmentURLTemplate"];
        string activeDir = ConfigurationManager.AppSettings["EmailAttachmentSaveLocation"];
        string newPath = System.IO.Path.Combine(activeDir, ConfigurationManager.AppSettings["EmailAttachmentSaveFolder"]);
        var reportProcessor = new Telerik.Reporting.Processing.ReportProcessor();
        var reportSource = new Telerik.Reporting.UriReportSource()
        {
            Uri = reportName
        };
        reportSource.Parameters.Add("OrderID", 141);
        reportSource.Parameters.Add("OrderMethodTypeID", 2);

        var deviceInfo = new System.Collections.Hashtable()
        {
            {"DocumentTitle", "Order Report" }
        };

        var result = reportProcessor.RenderReport("PDF", reportSource, deviceInfo);
        if (!result.HasErrors)
        {
            System.IO.Directory.CreateDirectory(newPath);
            string newFileName = "OrderReport.pdf";
            newPath = System.IO.Path.Combine(newPath, newFileName);
            FileStream fileStream = new FileStream(newPath, FileMode.Create, FileAccess.ReadWrite);
            fileStream.Write(result.DocumentBytes, 0, result.DocumentBytes.Length);
            fileStream.Close();
            HttpResponseMessage fileResult = new HttpResponseMessage(HttpStatusCode.OK);
            var stream = new FileStream(newPath, FileMode.Open);
            fileResult.Content = new StreamContent(stream);
            fileResult.Content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
            fileResult.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment");
            fileResult.Content.Headers.ContentDisposition.FileName = newFileName;
            return fileResult;
        }
        else
        {
            throw new Exception("Report contains errors. " + result.Errors[0].Message);
        }
    }