下载要生成的报告文件到客户端

Question

我正在使用以下代码来创建和下载 Telerik 报告。

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);
}
}

一旦我将它托管在服务器中，它就会在服务器端创建文件。如何在不在服务器中创建任何文件的情况下将其下载到客户端计算机中。

Answer 1

我可以通过使用返回类型 HttpResponseMessage 将文件返回给客户端来做到这一点

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);
        }
    }