After a user clicks a button, I want a file to be downloaded. I've tried the following which seems to work, but not without throwing an exception (ThreadAbort) which is not acceptable.
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(Server.MapPath("FileDownload.csv"));
response.Flush();
response.End();
You can use an HTTP Handler (.ashx) to download a file, like this:
DownloadFile.ashx:
public class DownloadFile : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
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(Server.MapPath("FileDownload.csv"));
response.Flush();
response.End();
}
public bool IsReusable
{
get
{
return false;
}
}
}
Then you can call the HTTP Handler from the button click event handler, like this:
Markup:
<asp:Button ID="btnDownload" runat="server" Text="Download File"
OnClick="btnDownload_Click"/>
Code-Behind:
protected void btnDownload_Click(object sender, EventArgs e)
{
Response.Redirect("PathToHttpHandler/DownloadFile.ashx");
}
Passing a parameter to the HTTP Handler:
You can simply append a query string variable to the Response.Redirect(), like this:
Response.Redirect("PathToHttpHandler/DownloadFile.ashx?yourVariable=yourValue");
Then in the actual handler code you can use the Request object in the HttpContext to grab the query string variable value, like this:
System.Web.HttpRequest request = System.Web.HttpContext.Current.Request;
string yourVariableValue = request.QueryString["yourVariable"];
// Use the yourVariableValue here
Note - it is common to pass a filename as a query string parameter to suggest to the user what the file actually is, in which case they can override that name value with Save As...
Try this set of code to download a CSV file from the server.
byte[] Content= File.ReadAllBytes(FilePath); //missing ;
Response.ContentType = "text/csv";
Response.AddHeader("content-disposition", "attachment; filename=" + fileName + ".csv");
Response.BufferOutput = true;
Response.OutputStream.Write(Content, 0, Content.Length);
Response.End();
Making changes as below and redeploying on server content type as
Response.ContentType = "application/octet-stream";
This worked for me.
Response.Clear();
Response.AddHeader("Content-Disposition", "attachment; filename=" + file.Name);
Response.AddHeader("Content-Length", file.Length.ToString());
Response.ContentType = "application/octet-stream";
Response.WriteFile(file.FullName);
Response.End();
Further to Karl Anderson solution, you could put your parameters into session information and then clear them after response.TransmitFile(Server.MapPath( Session(currentSessionItemName)));.
See MSDN page HttpSessionState.Add Method (String, Object) for more information on sessions.
protected void DescargarArchivo(string strRuta, string strFile)
{
FileInfo ObjArchivo = new System.IO.FileInfo(strRuta);
Response.Clear();
Response.AddHeader("Content-Disposition", "attachment; filename=" + strFile);
Response.AddHeader("Content-Length", ObjArchivo.Length.ToString());
Response.ContentType = "application/pdf";
Response.WriteFile(ObjArchivo.FullName);
Response.End();
}
Simple solution for downloading a file from the server:
protected void btnDownload_Click(object sender, EventArgs e)
{
string FileName = "Durgesh.jpg"; // It's a file name displayed on downloaded file on client side.
System.Web.HttpResponse response = System.Web.HttpContext.Current.Response;
response.ClearContent();
response.Clear();
response.ContentType = "image/jpeg";
response.AddHeader("Content-Disposition", "attachment; filename=" + FileName + ";");
response.TransmitFile(Server.MapPath("~/File/001.jpg"));
response.Flush();
response.End();
}
Related
I trying to download SSRS report in excel format from my MVC application.
Response.Clear();
Response.Buffer = true;
Response.Charset = "";
Response.Cache.SetCacheability(HttpCacheability.NoCache);
Response.ContentType = "application/vnd.ms-excel";
Response.AppendHeader("Content-Disposition", "attachment; filename=" + reportName + "." + extension);
Response.BinaryWrite(result);
Response.Flush();
Response.End();
But i am getting this error as -
System.Web.HttpException (0x80004005): Server cannot set content type after HTTP headers have been sent.
I tried changing Response.Buffer to BufferOutput but still getting the same error.
What am I missing here?
In the code below, i tried to download an excel file as -
Response.Clear();
Response.Buffer = true;
Response.Charset = "";
Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
Response.AddHeader($"content-disposition", "attachment;filename=" + "{reportFileName}" + ".xlsx");
using (System.IO.MemoryStream MyMemoryStream = new MemoryStream())
{
MyMemoryStream.Write(result, 0 , result.Length);
MyMemoryStream.WriteTo(Response.OutputStream);
Response.Flush();
Response.End();
return File(MyMemoryStream.ToArray(), "application/octet-stream");
}
when I click on it my file doesn't open properly enter image description here
string filePath = (sender as LinkButton).CommandArgument;
Response.ContentType = ContentType;
// Response.AppendHeader("Content-Disposition", "attachment; filename=" + Path.GetFileName(filePath));
Response.AddHeader("Content-Disposition", "inline; filename"+Path.GetFileName(filePath)+".pdf");
Response.WriteFile(filePath);
Response.End();
}
You can try this code to get your work done,
string pdfPath = Server.MapPath("~/SomePDFFile.pdf");
WebClient client = new WebClient();
Byte[] buffer = client.DownloadData(pdfPath);
Response.ContentType = "application/pdf";
Response.AddHeader("content-length", buffer.Length.ToString());
Response.BinaryWrite(buffer);
string filePath1 = (sender as LinkButton).CommandArgument;
string filepath = ("D:\\RetailAgreement\\" + filePath1);
FileInfo myfile = new FileInfo(filepath);
if (filePath1 != "")
{
Response.ClearContent();
Response.AddHeader("Content-Disposition", "attachment; filename=" + myfile.Name);
Response.AddHeader("Content-Length", myfile.Length.ToString());
Response.ContentType = ReturnExtension(myfile.Extension.ToLower());
Response.TransmitFile(myfile.FullName);
Response.End();
}
I tried like this but it is not working ,
I don't know where i went wrong. I am using C#3.0
File.Copy("D:\\RetailAgreement\\",Server.Mapth("YourAplicationPath\\MyFiles"), true);
//Copy Files to Your Application Path
string path = Server.MapPath("~\MyFiles" + filePath1");
System.IO.FileInfo file = new System.IO.FileInfo(path);
string Outgoingfile = "myfile.xlsx";
if (file.Exists)
{
Response.Clear();
Response.ClearContent();
Response.ClearHeaders();
Response.AddHeader("Content-Disposition", "attachment; filename=" + Outgoingfile);
Response.AddHeader("Content-Length", file.Length.ToString());
Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
Response.WriteFile(file.FullName);
Response.Flush();
Response.Close();
}
else
{
Response.Write("This file does not exist.");
}
use this code.
string path = Server.MapPath("~/DownloadedExcelFilesOp4/myfile.xlsx");
System.IO.FileInfo file = new System.IO.FileInfo(path);
string Outgoingfile = "myfile.xlsx";
if (file.Exists)
{
Response.Clear();
Response.ClearContent();
Response.ClearHeaders();
Response.AddHeader("Content-Disposition", "attachment; filename=" + Outgoingfile);
Response.AddHeader("Content-Length", file.Length.ToString());
Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
Response.WriteFile(file.FullName);
Response.Flush();
Response.Close();
}
else
{
Response.Write("This file does not exist.");
}
I have a C# application which saves a completed PDF file on a folder inside my site. During the operation I save two session variable to the filename and the filepath in the server:
string strFileName = "completed_pdf_" + k + ".pdf"; //k is a variable in a function for the name
Session["fileName"] = strFileName;
MessageBox.Show(Session["fileName"].toString()); //displays: completed_pdf_{name}.pdf
newFileServer = System.Environment.MachineName + #"/PDFGenerate/completed_pdf_" + k + ".pdf";
strFullPath = Path.GetFullPath("//" + newFileServer);
List<System.Web.UI.WebControls.ListItem> files = new List<System.Web.UI.WebControls.ListItem>();
files.Add(new System.Web.UI.WebControls.ListItem(strFullPath, strFullPath));
strN = files[0].ToString();
Session["pathName"] = strN;
MessageBox.Show(Session["pathName"].toString()); //displays: \\myserver\pdfgen\completed_pdf_{name}.pdf
I have a GridView which displays a LinkButton:
<asp:LinkButton ID="lnkDownload" Text = "Download" runat="server" OnClick = "DownloadFile" />
The function for the LinkButton is:
protected void DownloadFile(object sender, EventArgs e)
{
//MessageBox.Show(Session["pathName"].ToString()); //displays correctly
//MessageBox.Show(Session["fileName"].ToString()); //displays correctly
Response.Redirect("DownloadFilePDF.ashx?myvar=" + Session["pathName"].ToString() + "&myvar2=" + Session["fileName"].ToString());
}
My HTTPHandler code is this:
<%# WebHandler Language="C#" Class="DownloadFilePDF" %>
using System;
using System.Web;
public class DownloadFilePDF : IHttpHandler {
public void ProcessRequest (HttpContext context) {
System.Web.HttpRequest request = System.Web.HttpContext.Current.Request;
string strSessVar = request.QueryString["pathName"];
System.Web.HttpRequest request2 = System.Web.HttpContext.Current.Request;
string strSessVar2 = request.QueryString["fileName"];
System.Web.HttpResponse response = System.Web.HttpContext.Current.Response;
response.ClearContent();
response.Clear();
response.ContentType = "application/pdf";
response.AddHeader("Content-Disposition", "attachment; filename=" + strSessVar + ";");
response.End();
}
public bool IsReusable {
get {
return false;
}
}
}
When I run my website in the server itself, it asks me to download the ASHX file but if I run my website from my local PC which is on the same network as the server, it prompts me to download the PDF file. Everything is good so far, however, I am running into two issues:
The filename that is it downloading in my PC is DownloadFilePDF which is the HttpHandler filename.
The file is 0 Byte and when I open the file, it is not the right file type.
How can I fix so that..
The filename is the fileName QueryString I am sending to the HttpHandler file.
I can download the file which is residing in the server itself, so it's not 0 Byte.
How to give a downloaded file unique name
You can use couple of options, like the Guid class, DateTime.Now method and so on in order to have a unique identifier for the downloaded file, for example, use Guid.NewGuid:
response.AddHeader("Content-Disposition", "attachment; filename=" + string.format(strSessVar+{0}, Gui.NewGuid()) + ";");
UPDATE:
By using the following code you're doing nothing but sending an empty file:
System.Web.HttpResponse response = System.Web.HttpContext.Current.Response;
response.ClearContent();
response.Clear();
response.ContentType = "application/pdf";
response.AddHeader("Content-Disposition", "attachment; filename=" + strSessVar + ";");
response.End();
In order to solve it, jst stream your file content to the response, look:
response.BinaryWrite(GetFileContentsFromSomewhere());
Something is amiss here. I don't see any content being streamed to the client. You need to provide the content in the response, like this:
System.Web.HttpResponse response = System.Web.HttpContext.Current.Response;
response.ClearContent();
response.Clear();
response.ContentType = "application/pdf";
response.AddHeader("Content-Disposition", "attachment; filename=" + strSessVar + ";");
response.BinaryWrite(GetFileContentsFromSomewhere()); //<--- this baby does all the magic
response.End();
The GetFileContentsFromSomewhere() implementation depends on where you intend the file to come from. If it's just a static file on your web server, you could use something like this:
response.WriteFile(localPathOfFile);
or
response.WriteFile(Server.MapPath(urlOfFile));
I am trying to download excel file to the location in local system but on opening the file, i am getting error:
The file format or extension does not match.
Although the file at backend is of same extension but i am getting the error
PFB the code:
string ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
Response.ContentType = ContentType;
Response.AppendHeader("Content-Disposition", "attachment; filename="+downloadedFileName);
downloadedFileName= "Myfile.xlsx"
It will save as details.xls
Response.ClearContent();
Response.Buffer = true;
Response.AddHeader("content-disposition", string.Format("attachment; filename={0}", "Details.xls"));
Response.ContentType = "application/ms-excel";
You have this error because you're not using Response.TransmitFile(). Your code should be:
string ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
Response.ContentType = ContentType;
Response.AppendHeader("Content-Disposition", "attachment; filename="+downloadedFileName);
Response.TransmitFile(FilePath); // full path here