Creating PDF using C# - c#

When I try to convert binary file to PDF the pdf has damaged.
byte[] stream = presenter.getItemTable();
Response.Clear();
Response.ClearHeaders();
Response.ContentType = "application/pdf";
Response.AddHeader ("Content-Disposition", "attachment; filename=PressRelease.pdf");
Response.BinaryWrite(stream);//Entities.EDRSearchResult.ByteStream);
Response.Flush();
Response.End();
However when I convert same binary to Excel it is working fine and can open without any error.
byte[] stream = presenter.getItemTable();
Response.Clear();
Response.ClearHeaders();
Response.ContentType = "application/vnd.openxmlformats - officedocument.spreadsheetml.sheet";
Response.AddHeader("content-disposition","attachment;filename=DataTable.xls");
Response.BinaryWrite(stream);
Response.Flush();
Response.End();
Please help me.


when you try to convert binary file to PDF in this case you write
Response.AddHeader ("Content-Disposition", "attachment; filename=PressRelease.pdf");
Try
Response.AddHeader ("content-disposition", "attachment; filename=PressRelease.pdf");

Related

C# - Server cannot set content type after HTTP headers have been sent

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");
}

Whenever i click on view online button my file doesn't show proper pdf in asp.net

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);

Show a progress bar when using Response.Transmitfile

On a web forms button click I am doing a simple file download
FileInfo file = new FileInfo(resourcesFolderPath + fileName); Response.Clear();
Response.ClearHeaders();
Response.ClearContent();
Response.AddHeader("Content-Disposition", "attachment; filename=" + file.Name);
Response.AddHeader("Content-Length", file.Length.ToString());
Response.ContentType = "text/plain";
Response.Flush();
Response.TransmitFile(file.FullName);
Response.End();
As some of the files are quite large anyone know how I can show a progress bar via jQuery / javascript?

How to export csv as a zip file in c#

I am to create a CSV and write information to it and then download it.Now I have to download it as a zip format.
public void WriteToCSV(List<DeviceModel> DeviceList)
{
string attachment = "attachment; filename=DeviceModel.csv";
Response.Clear();
Response.ClearHeaders();
Response.ClearContent();
Response.AddHeader("content-disposition", attachment);
Response.ContentType = "text/csv";
Response.AddHeader("Pragma", "public");
WriteColumnName();
foreach (DeviceModel Device in DeviceList)
{
WriteDeviceInfo(Device);
}
Response.End();
}

You can use a library for that :
http://dotnetzip.codeplex.com/

Downloaded excel file not opening

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

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