angular - Display PDF file from C# to Angular2 view -


i'm trying display pdf uploaded server. pdf resides inside app_data folder. want fetch using c# web api 2 , display in angular 2 frontend view.

c# code:

  httpresponsemessage response = request.createresponse(httpstatuscode.badrequest);   string filename = "somefilename.pdf";   byte[] buffer = new byte[0];   memorystream memstream = new memorystream();     if (filename != "") {     pdfreader reader = new pdfreader(path.combine(httpcontext.current.request.physicalapplicationpath) + "/app_data/uploads/pdfs/" + filename);     pdfstamper stamper = new pdfstamper(reader, memstream);      response = request.createresponse(httpstatuscode.ok);     buffer = memstream.toarray();     response.content = new streamcontent(new memorystream(buffer));     response.content.headers.contenttype = new mediatypeheadervalue("application/pdf");     response.content.headers.contentlength = buffer.length;     contentdispositionheadervalue contentdisposition = null;     if (contentdispositionheadervalue.tryparse("inline; filename=" + filename, out contentdisposition))     {       response.content.headers.contentdisposition = contentdisposition;     }   }    return response;

angular 2 code:

this.documentsservice.getfile()                 .subscribe((response: any) => {                     let file = new blob([response], { type: 'application/pdf' });                     let url = url.createobjecturl(file);                     window.open(url);                 });

i think angular code wrong. nevertheless, first goal here fetch mvc side. right file gets downloaded , it's corrupted or there's not fetch correctly. give me 15bytes size pdf file, know there's wrong. i'm using itextsharp in c# backend.

thanks in advance!

from comment (providing answer easier code):

if (filename != "") {     var fs = system.io.file.openread(filename);     _mydisposable = fs; // see further down in answer.     var response = request.createresponse(httpstatuscode.ok);     response.content = new streamcontent(fs);     response.content.headers.contenttype = new mediatypeheadervalue("application/pdf");     return response; }  return response;

edit: code posted above works me. problem disposing of stream. best way creating private idisposable member on controller class, , adding dispose override, sort of this:

private idisposable _mydisposable; public override void dispose(bool disposing) {     if (disposing && _mydisposable != null)         _mydisposable.dispose(); }

please note assumes asp.net done request (which seems reasonable, because it's disposing of controller), should correct.


Comments

Post a Comment

Popular posts from this blog

angular - Ionic slides - dynamically add slides before and after -

hi i'm using ngfor create set of 3 slides while starting in middle i'm guaranteed able slide left or right on start. when slide right can simple listen reachedend , push slide array i'm looping. but have problem adding slide beginning. if same above , use e.g. array.unshift() or spread add item beginning, view think it's on position 0 , snaps view new slide. the code below work animates slide change index 1. slide = [0,1,2] //example loop slidechanged(event) { if(this.slides.isbeginning()){ this.slide = [this.slide[0]-1, ...this.slide]; this.slides.update(); this.slides.slideto(1) } } <ion-slides [initialslide]="1" (ionslidedidchange)="slidechanged($event)"> <ion-slide *ngfor="let item of slide"> <h1>slide {{item}}</h1> </ion-slide> </ion-slides> any appreciated! you can using ionslidenextend , ionslideprevend events slides . please...
Read more

Add a dynamic header in angular 2 http provider -

i have http interceptor built via tutorial https://scotch.io/@kashyapmukkamala/using-http-interceptor-with-angular2 the problem need have dynamic header changes automatically once changes 'mode' in app. service able tell interceptor change header, or have interceptor pull header (which string)from service each request. able throwing away patch method, call http.patch('new header string') set header string. call in service controls 'mode' setting. wondering if there way interceptor pull recent value service each request or if can add method http provider via interceptor? i've tried call service in interceptor each request returns undefined. because creating new instance of service or copying value before service fired , loaded/changed data. i don't want pass header string every http provider call because defeats purpose of having interceptor, id able set once changes or have provider fetch service before makes request. tl;dr : need add autom...
Read more

minify - Minimizing css files -

i want know how css files can minimized. currently, using external sites css minifier compress css files. however, after removing whitespaces, comments, etc, file sizes reduced 10-15%. how frameworks bootstrap manage make minimized versions kilobytes. as example, css is: body { background-color: #ff0; } the reduction goes 28 bytes 22 bytes other css files have lot more characters still smaller this. actually minifying code means it's remove thing code white space characters new line characters comments block delimiters it reduces amount of code has transferred on web , speed site load fastly.but unreadable format.
Read more