C#: How to display a PDF in a new Browser?

Giovanbattista Barra

8y1.1kLearn iOS Programming

Hi Teams,

I'm here again to ask a question about my project.

I have a class where the PDF will be displayed:

public class FileDownload : IHttpHandler, System.Web.SessionState.IRequiresSessionState

{

bool IHttpHandler.IsReusable => true;

public void ProcessRequest(HttpContext context)

{

var path = context.Request.QueryString["path"];

//if(File.Exists(path + "\\PDF"))

if (File.Exists(path))

{

try

{

string filePath = path;

var file = Path.GetFileName(filePath);

context.Response.Clear();

context.Response.ContentType = "application/pdf";

context.Response.AddHeader("Content-Disposition", "attachment; filename=" + file);

context.Response.TransmitFile(filePath);

context.Response.Flush();

}

catch { }

}

and in JavaScript I have the corresponding Event Handler "window.open()" so that a new tab will be opened after I click the button to see the pdf:

window.open("FileDownload.ashx?path=" + response.d, "\\PDF", "_blank");

I have a problem with that, because when I click the button, the new window will be opened but: 1) the browser adress stays empty and

2) the pdf will be only downloaded

3) I first have to click on the pdf so that I can see the content of the pdf

My goal is to open the PDF directly in the new browser (with ist address/url).

Does it depend on the TransmitFile() in C#?

I really hope you can help me.

Many Thanks

Best regards

3 Replies

Know the answer? Post it — somebody with the same question will find it here.

Maen Badwan8y ago
If your main goal is to display PDF documents in your web application, you can try using HTML5/JavaScript Document Viewer features from LEADTOOLS SDK that supports loading document formats including PDF, DOC, DOCX, etc. For example, the following code shows how you can initialize the document viewer control and load a PDF document:
window.onload = function () {
// Init the document viewer, pass along the panels
var createOptions = new lt.Documents.UI.DocumentViewerCreateOptions();
// We are not going to use elements mode in this example
createOptions.viewCreateOptions.useElements = false;
createOptions.thumbnailsCreateOptions.useElements = false;

// Set thumbnailsContainer
createOptions.thumbnailsContainer = document.getElementById("thumbnailsDiv");
// Set viewContainer
createOptions.viewContainer = document.getElementById("documentViewerDiv");

// Create the document viewer
this._documentViewer = lt.Documents.UI.DocumentViewerFactory.createDocumentViewer(createOptions);

this._documentViewer.view.preferredItemType = lt.Documents.UI.DocumentViewerItemType.image;
var _this = this;

// Load a PDF document
var url = "http://demo.leadtools.com/images/pdf/leadtools.pdf";
lt.Documents.DocumentFactory.loadFromUri(url, null)
.done( function(document) {

// Set the document in the viewer
_this._documentViewer.setDocument(document);
})
.fail(function (jqXHR, statusText, errorThrown) {
alert("Error loading document: " + errorThrown)
});
}
More details can be found here:
https://www.leadtools.com/help/leadtools/v20/dh/javascript/to/using-the-leadtools-document-viewer.html
0
Giovanbattista Barra8y ago
many Thanks Mr. Telgave
0
Shrimant Telgave8y ago
Hello Giovanbattista Barra,

The following link will help you.

https://stackoverflow.com/questions/8294057/how-to-open-pdf-file-in-a-new-tab-or-window-instead-of-downloading-it-using-asp
Response.Write("");
https://www.codeproject.com/Questions/1063212/How-to-show-PDF-in-new-browser-tab-using-asp-net
0