Dynamic load assembly in WinRT

0

I have created a program to load dynamic assemblies using the following code:

using System;
using System.Collections.Generic;
using System.Reflection;
using System.Threading.Tasks;

namespace BarcodeReader
{
   public class Parsing
   {
      private static string _FolderName = "BarcodeReaders";
      private static bool _Initialized = false;
      private static IEnumerable<IBarcodeReader> _Objs;

      /// Parse the picture
      /// <returns>The value from the picture</returns>
      public static async Task<string> ParsePicture()
      {
         // Check if this class has not been initialized, and if it hasn't initialize it
         if (!_Initialized)
         {
            await InitializeAsync();
         }

         foreach (var Obj in _Objs)
         {
            if (Obj.IsType())
            {
               return Obj.GetValue();
            }
         }

         return null;
      }

      private static async Task InitializeAsync()
      {
         // Get the folder
         var Folder = await GetFolder();

         // Get the Files in the Folder
         var Files = await Folder.GetFilesAsync();

         // Initialize the objects and set them
         _Objs = InitializeObjects(Files);

         // Set it as initialized
         _Initialized = true;
      }

      private static IEnumerable<IBarcodeReader> InitializeObjects(IEnumerable<Windows.Storage.StorageFile> Files)
      {
         foreach (var File in Files)
         {
            string Name = File.Path;
            var Assembly = System.Reflection.Assembly.Load(new AssemblyName(Name));
            foreach (var Typ in Assembly.ExportedTypes)
            {
               var TypInfo = Typ.GetTypeInfo();
               foreach (var Interf in TypInfo.ImplementedInterfaces)
               {
                  if (Interf.Name.Equals("IBarcodeReader"))
                  {
                     yield return (IBarcodeReader)Activator.CreateInstance(Typ);
                  }
               }
            }
         }
      }

      private static async Task<bool> BarcodeFolderExist(Windows.Storage.StorageFolder Folder)
      {
         // Get all folders
         var Folders = await Folder.GetFoldersAsync();

         // For each folder, check if it is the Folder we are searching and if it is return true
         foreach (var Foldr in Folders)
         {
            if (Foldr.Name.Equals(_FolderName))
            {
               return true;
            }
         }

         // Return false as the folder was not found
         return false;
      }

      private static async Task<Windows.Storage.StorageFolder> GetFolder()
      {
         // Get the local-folder
         var Folder = Windows.Storage.ApplicationData.Current.LocalFolder;

         // Check if the folder does not exist, and if it does not create it
         if (!await BarcodeFolderExist(Folder))
         {
            await Folder.CreateFolderAsync(_FolderName);
         }

         return await Folder.GetFolderAsync(_FolderName);
      }
   }
}

And the project I am trying to load is these files

namespace QRReader
{
   public sealed class QRReader : IBarcodeReader
   {
      public bool IsType()
      {
         return true;
      }

      public string GetValue()
      {
         return "HEJ";
      }
   }

   public interface IBarcodeReader
   {
      bool IsType();
      string GetValue();
   }
}

But I get this error

FileLoadException was unhandled by user code
The assembly name or code base was illegal. (Exception HRESULT: 0x80131047)

The name-variable is set to C:\Users\Lasse\AppData\Local\Packages\93e3b2c9-7ef8-4537-be39-d0f3e93ca100_e85ydygyad1dy\LocalState\BarcodeReaders\QRReader.winmd

c#
windows-runtime
asked on Stack Overflow Dec 25, 2012 by The87Boy

1 Answer

0

Everything I've read on the internet says that Microsoft have made it a deliberate security feature of the runtime environment (WinRT, and UWP) that it be impossible to load assemblies at runtime. This is a show stopping limiting feature in UWP. It more or less renders the platforms useless because if there are customisations for a given customer, the application vendor would have to split the app and deploy it a version to the store for each customer.

Please take the time to up vote this feature request on allowing assemblies to be loaded dynamically at runtime: https://wpdev.uservoice.com/forums/110705-universal-windows-platform/suggestions/18145291-dynamically-load-assembly

answered on Stack Overflow Feb 14, 2017 by Melbourne Developer

User contributions licensed under CC BY-SA 3.0