PDF download and viewing - Xamarin.iOS

PDFUtils.cs

using System;
using System.IO;
using System.Threading.Tasks;
using MonoTouch.UIKit;
using MonoTouch.QuickLook;
using System.Net;
using MonoTouch.Foundation;
using System.Security.Cryptography;
using System.Text;

namespace BigTed.Utils
{

  public class PDFItem : QLPreviewItem
	{
		string title;
		string uri;
		
		public PDFItem(string title, string uri)
		{
			this.title = title;
			this.uri = uri;
		}
		
		public override string ItemTitle {
			get { return title; }
		}
		
		public override NSUrl ItemUrl {
			get { return NSUrl.FromFilename(uri); }
		}
	}
	
	public class PDFPreviewControllerDataSource : QLPreviewControllerDataSource
	{
		string url = "";
		string filename = "";
		
		public PDFPreviewControllerDataSource (string url, string filename)
		{
			this.url = url;
			this.filename = filename;
		}
		
		public override QLPreviewItem GetPreviewItem (QLPreviewController controller, int index)
		{
			return new PDFItem (filename, url);
		}
		
		public override int PreviewItemCount (QLPreviewController controller)
		{
			return 1;
		}
	}


	public class BTPdfUtils
	{
		public static string UrlHash(string source)
		{
			MD5CryptoServiceProvider md5Hasher = new MD5CryptoServiceProvider();
			
			// Convert the input string to a byte array and compute the hash. 
			byte[] data = md5Hasher.ComputeHash(Encoding.Default.GetBytes(source));
			
			// Create a new Stringbuilder to collect the bytes 
			// and create a string.
			StringBuilder sBuilder = new StringBuilder();
			
			// Loop through each byte of the hashed data  
			// and format each one as a hexadecimal string. 
			for (int i = 0; i < data.Length; i++)
			{
				sBuilder.Append(data[i].ToString("x2"));
			}
			
			// Return the hexadecimal string. 
			return sBuilder.ToString();

		}

		public static void DownloadAndDisplayPdf (string url, string filename, UINavigationController parentController)
		{
			
			string path = Path.Combine (Environment.GetFolderPath (Environment.SpecialFolder.Personal), "attachments");
			if (!Directory.Exists(path)) Directory.CreateDirectory(path);
			string hash = UrlHash (url);
			path = Path.Combine (path, hash);
			if (!Directory.Exists(path)) Directory.CreateDirectory(path);

			string newFilename = Path.Combine (path, filename);

			if (!newFilename.StartsWith (path))
			{
				newFilename = Path.Combine (path, hash + ".pdf");
			}
			
			Task.Factory.StartNew (() => {
				try 
				{
					if (File.Exists (newFilename)) 
					{
						var fi = new FileInfo(newFilename);
						if (fi.Length > 1024 * 2)
						{
							return true;
						}

						File.Delete (newFilename);
					}

					if (Reachability.InternetConnectionStatus() == NetworkStatus.NotReachable) 
					{
					
						return false;
					}
					


					
					var wc = new WebClient();
					
					wc.DownloadFile(new Uri(url), newFilename);
					return true;
				} catch (Exception ex){
					return false;
				}
			}).ContinueWith (tr => {
				
				BTUtils.HideStatus();
				
				if (tr.Result) 
				{
					
					QLPreviewController previewController = new QLPreviewController ();
					previewController.DataSource = new PDFPreviewControllerDataSource (newFilename, filename);
				
					parentController.PushViewController(previewController, true);

					
				} else {
					//show a fail to the user
				}
				
				
				
				
			}, new UIKitScheduler ());
		}
	}
}

is QuickLook available in visual studio for windows? I have been trying to find it on nuget but not successful