在C#中使用SaveOrOpenFileDialog下载pdf文件 [英] download pdf file using SaveOrOpenFileDialog in c#

问题描述

我正在开发Web应用程序，

我使用Visual Stadio 2008做了一个水晶报告，可以生成pdf文件，当以pdf格式打开该报告时，它在与我的asp页面相同的窗口中打开，我希望在单击报告时可以打开saveorOpenFile窗口，这样我就可以打开或保存该报告.

如果您知道如何在c#中执行SaveOrOpenFileDialog，请提供帮助
我尝试了它不起作用:

I''m developing a web application,

I did a crystal report using visual stadio 2008 which can generate pdf file, when open that report in pdf it is open in the same window as my asp pages, i want that when click on report it can open saveorOpenFile window so that i can open or save that report.

please helps if you know how to do SaveOrOpenFileDialog in c#
I tried this it don''t work:

string str = @"~/Reports/ReportViewing.aspx?report=rptReservationByOffice&StartDate=" + txtStartDate.Text + "&EndDate=" + txtEndDate.Text;

           String FileName = "FileName.txt";
           String FilePath =str; //Replace this
           System.Web.HttpResponse response = System.Web.HttpContext.Current.Response;
           response.ClearContent();
           response.Clear();
           response.ContentType = "text/plain";
           response.AddHeader("Content-Disposition", "attachment; filename=" + FileName + ";");
           response.TransmitFile(FilePath);
           response.Flush();
           response.End();

推荐答案

private static MemoryStream downloadData(string url)
            {
                try
                {
                    progress.Value = 0;
                    Application.DoEvents();
                    //Get a data stream from the url
                    WebRequest req = WebRequest.Create(url);
                    WebResponse response = req.GetResponse();
                    Stream stream = response.GetResponseStream();

                    //Download in chuncks
                    Byte[] buffer = new Byte[1024];

                    //Get Total Size
                    Int32 dataLength = (Int32)response.ContentLength;

                    //With the total data we can set up our progress indicators
                    progress.Maximum = dataLength;
                    Application.DoEvents();
                    //Download to memory
                    //Note: adjust the streams here to download directly to the hard drive
                    MemoryStream memStream = new MemoryStream();
                    while (true)
                    {
                        //Try to read the data
                        Int32 bytesRead = stream.Read(buffer, 0, buffer.Length);

                        if (bytesRead == 0)
                        {
                            progress.Value = progress.Maximum;
                            Application.DoEvents();
                            break;
                        }
                        else
                        {
                            //Write the downloaded data
                            memStream.Write(buffer, 0, bytesRead);
                            if (progress.Value + bytesRead <= progress.Maximum)
                            {
                                progress.Value += bytesRead;
                                progress.Refresh();
                                Application.DoEvents();
                            }
                        }
                    }

                    stream.Close();
                    return memStream;
                }
                catch 
                {
                    //May not be connected to the internet
                    //Or the URL might not exist
                    throw new Exception("There was an error accessing the URL.");
                }
            }

现在要使用此

now to use this

string str = @"~/Reports/ReportViewing.aspx?report=rptReservationByOffice&StartDate=" + txtStartDate.Text + "&EndDate=" + txtEndDate.Text;
byte[] DownloadedData = DownloadData(str);
            if (DownloadedData == null || DownloadedData.Length == 0)
                return;
using (Stream Writer = File.Create(FilePath))
            {               
                Writer.Write(DownloadedData, 0, DownloadedData.Length);
            }         

您可以使用

you can use

var str = "../Reports/ReportViewing.aspx?report=rptReservationByOffice&StartDate=" + document.getElementById("txtStartDate").value + "&EndDate=" + document.getElementById("txtEndDate").value;

window.open(str);

您可以从此处使用该窗口获取有关 window.open 的帮助. .open方法 [^ ]

谢谢，
Imdadhusen

you may take help for window.open from here Using the window.open method[^]

Thanks,
Imdadhusen

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