我完成了一个可以在计算机和手机上访问的PDF应用程序。我已经将webapp带到了azure，但遗憾的是它无法下载PDF文件。但是，PDF文件的下载仅适用于localhost。因此，我想问一下为什么PDF文件的下载只能在本地主机上工作，而不能在azure上线时使用。
这正是我的PDF下载按钮的工作方式。
protected void btnPDF_Click(object sender, EventArgs e)
{
var doc1 = new Document();
var filename = "MyTestPDF" + DateTime.Now.ToString("yyyyMMddHHmmssfff") + ".pdf";
var output = new FileStream(Path.Combine("C:\\Users\\apr13mpsip\\Downloads", filename), FileMode.Create);
iTextSharp.text.pdf.PdfWriter.GetInstance(doc1, output);
doc1.Open();
PdfPTable table = new PdfPTable(1);
table.TotalWidth = 585f;
table.LockedWidth = true;
var logo = iTextSharp.text.Image.GetInstance(Server.MapPath("~/image/logo.jpg"));
doc1.Add(logo);
var titleFont = FontFactory.GetFont("Arial", 18, Font.BOLD);
doc1.Add(new Paragraph("Officer's Profile. Officer's Police ID: " + DDLCase.SelectedValue, titleFont));
var normalFont = FontFactory.GetFont(FontFactory.HELVETICA, 14, Font.BOLD);
var phrase = new Phrase();
SqlConnection con = new SqlConnection("Data Source = localhost; Initial Catalog = project; Integrated Security = SSPI");
SqlCommand cm = new SqlCommand("Select lrp.fullname, pp.profilepic, pp.rank, lrp.policeid, lrp.nric, lrp.email, lrp.contact, lrp.address,lrp.location, pp.achievement, pp.medal1, pp.medal2, pp.medal3, pp.medal4, pp.medal5 from LoginRegisterPolice lrp, PoliceProfile pp where lrp.policeid = '" + DDLCase.SelectedValue + "' and pp.policeid = lrp.policeid", con);
con.Open();
SqlDataReader dr;
dr = cm.ExecuteReader();
if (dr.Read())
{
phrase.Add(new Chunk("Full Name :", normalFont));
phrase.Add(dr[0].ToString());
phrase.Add(Chunk.NEWLINE);
phrase.Add(Chunk.NEWLINE);
phrase.Add(Chunk.NEWLINE);
phrase.Add(Chunk.NEWLINE);
phrase.Add(Chunk.NEWLINE);
phrase.Add(Chunk.NEWLINE);
phrase.Add(Chunk.NEWLINE);
phrase.Add(new Chunk("Profile Picture :\u00a0", normalFont));
Byte[] bytes1 = (Byte[])dr[1];
iTextSharp.text.Image image1 = iTextSharp.text.Image.GetInstance(bytes1);
image1.ScaleToFit(100f, 250f);
Chunk imageChunk1 = new Chunk(image1, 0, 0);
phrase.Add(imageChunk1);
phrase.Add(Chunk.NEWLINE);
phrase.Add(Chunk.NEWLINE);
phrase.Add(Chunk.NEWLINE);
phrase.Add(Chunk.NEWLINE);
phrase.Add(Chunk.NEWLINE);
phrase.Add(new Chunk("Rank : ", normalFont));
Byte[] bytes2 = (Byte[])dr[2];
iTextSharp.text.Image image2 = iTextSharp.text.Image.GetInstance(bytes2);
image2.ScaleToFit(40f, 300f);
Chunk imageChunk2 = new Chunk(image2, 0, 0);
phrase.Add(imageChunk2);
phrase.Add(Chunk.NEWLINE);
phrase.Add(Chunk.NEWLINE);
phrase.Add(new Chunk("Police ID :", normalFont));
phrase.Add(dr[3].ToString());
phrase.Add(Chunk.NEWLINE);
phrase.Add(Chunk.NEWLINE);
phrase.Add(new Chunk("NRIC :", normalFont));
phrase.Add(dr[4].ToString());
phrase.Add(Chunk.NEWLINE);
phrase.Add(Chunk.NEWLINE);
phrase.Add(new Chunk("Email :", normalFont));
phrase.Add(dr[5].ToString());
phrase.Add(Chunk.NEWLINE);
phrase.Add(Chunk.NEWLINE);
phrase.Add(new Chunk("Contact :", normalFont));
phrase.Add(dr[6].ToString());
phrase.Add(Chunk.NEWLINE);
phrase.Add(Chunk.NEWLINE);
phrase.Add(new Chunk("Address :", normalFont));
phrase.Add(dr[7].ToString());
phrase.Add(Chunk.NEWLINE);
phrase.Add(Chunk.NEWLINE);
phrase.Add(new Chunk("Location :", normalFont));
phrase.Add(dr[8].ToString());
phrase.Add(Chunk.NEWLINE);
phrase.Add(Chunk.NEWLINE);
phrase.Add(new Chunk("Achievement :", normalFont));
phrase.Add(dr[9].ToString());
phrase.Add(Chunk.NEWLINE);
phrase.Add(Chunk.NEWLINE);
phrase.Add(Chunk.NEWLINE);
phrase.Add(Chunk.NEWLINE);
phrase.Add(new Chunk("Medal1", normalFont));
Byte[] bytes3 = (Byte[])dr[10];
iTextSharp.text.Image image3 = iTextSharp.text.Image.GetInstance(bytes3);
image3.ScaleToFit(800f, 800f);
Chunk imageChunk3 = new Chunk(image3, 0, 0);
phrase.Add(imageChunk3);
phrase.Add(new Chunk("Medal2", normalFont));
Byte[] bytes5 = (Byte[])dr[11];
iTextSharp.text.Image image5 = iTextSharp.text.Image.GetInstance(bytes5);
image5.ScaleToFit(800f, 800f);
Chunk imageChunk5 = new Chunk(image5, 0, 0);
phrase.Add(imageChunk5);
phrase.Add(new Chunk("Medal3", normalFont));
Byte[] bytes6 = (Byte[])dr[12];
iTextSharp.text.Image image6 = iTextSharp.text.Image.GetInstance(bytes6);
image6.ScaleToFit(800f, 800f);
Chunk imageChunk6 = new Chunk(image6, 0, 0);
phrase.Add(imageChunk6);
phrase.Add(new Chunk("Medal4", normalFont));
Byte[] bytes7 = (Byte[])dr[13];
iTextSharp.text.Image image7 = iTextSharp.text.Image.GetInstance(bytes7);
image7.ScaleToFit(800f, 800f);
Chunk imageChunk7 = new Chunk(image7, 0, 0);
phrase.Add(imageChunk7);
phrase.Add(new Chunk("Medal5", normalFont));
Byte[] bytes8 = (Byte[])dr[14];
iTextSharp.text.Image image8 = iTextSharp.text.Image.GetInstance(bytes8);
image8.ScaleToFit(800f, 800f);
Chunk imageChunk8 = new Chunk(image8, 0, 0);
phrase.Add(imageChunk8);
table.AddCell(phrase);
}
dr.Close();
doc1.Add(table);
doc1.Close();
btnPDF.Enabled = false;
}
}
PS：我硬编码了默认文件路径，以便我在localhost上测试我的应用程序，以确保完美的工作条件。因此，当我们尝试下载PDF而不是通常的硬编码文件路径时，我找到了为所有移动/计算机用户查找默认公共文件目录的方法
更新
我尝试使用Server.MapPath方法，但收到一些错误。
var doc1 = new Document();
var filename = Server.MapPath("~/pdf") + "MyTestPDF" + DateTime.Now.ToString("yyyyMMddHHmmssfff") + ".pdf";
// var output = new FileStream(Path.Combine("C:\\Users\\apr13mpsip\\Downloads", filename), FileMode.Create);
//iTextSharp.text.pdf.PdfWriter.GetInstance(doc1, output);
using (var output = File.Create(filename))
{
iTextSharp.text.pdf.PdfWriter.GetInstance(doc1, output);
}
doc1.Open();
这是我收到的错误
ObjectDisposedException was unhandled by user code
Cannot access a closed file.