While I can get the assembly version using the following code

            var assembly = typeof(App).GetTypeInfo().Assembly;
            var assemblyVersion = assembly.GetCustomAttribute&lt;AssemblyFileVersionAttribute&gt;().Version;

I would like to retrieve the Version from `Package.appxmanifest` in this case **1.0.0.4**

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
    &lt;Package xmlns=&quot;http://schemas.microsoft.com/appx/2010/manifest&quot; xmlns:m2=&quot;http://schemas.microsoft.com/appx/2013/manifest&quot;&gt;
      &lt;Identity Name=&quot;zzz&quot; Publisher=&quot;CN=zzz&quot; Version=&quot;1.0.0.4&quot; /&gt;


I expected to have access to `Windows.ApplicationModel`, but this is not available to me

Retrieve the Current App version from Package

I&#39;ve got this code:

    private async void ContextMenuForGroupRightTapped(object sender, RightTappedRoutedEventArgs args)
    {
        CheckBox ckbx = null;
        if (sender is CheckBox)
        {
            ckbx = sender as CheckBox;
        }
        if (null == ckbx)
        {
            return;
        }
        string groupName = ckbx.Content.ToString();

        var contextMenu = new PopupMenu();

        // Add a command to edit the current Group
        contextMenu.Commands.Add(new UICommand(&quot;Edit this Group&quot;, (contextMenuCmd) =&gt;
        {
            Frame.Navigate(typeof(LocationGroupCreator), groupName);
        }));

        // Add a command to delete the current Group
        contextMenu.Commands.Add(new UICommand(&quot;Delete this Group&quot;, (contextMenuCmd) =&gt;
        {
            SQLiteUtils slu = new SQLiteUtils();
            slu.DeleteGroupAsync(groupName); // this line raises Resharper&#39;s hackles, but appending await raises err msg. Where should the &quot;async&quot; be?
        }));

        // Show the context menu at the position the image was right-clicked
        await contextMenu.ShowAsync(args.GetPosition(this));
    }

...that Resharper&#39;s inspection complained about with, &quot;*Because this call is not awaited, execution of the current method continues before the call is completed. Consider applying the &#39;await&#39; operator to the result of the call*&quot; (on the line with the comment).

And so, I prepended an &quot;await&quot; to it but, of course, I then need to add an &quot;async&quot; somewhere, too - but where?

Where do I mark a lambda expression async?

I&#39;m implementing an API made by other colleagues with Apiary.io, in a Windows Store app project.

They show this example of a method I have to implement:

    var baseAddress = new Uri(&quot;https://private-a8014-xxxxxx.apiary-mock.com/&quot;);

    using (var httpClient = new HttpClient{ BaseAddress = baseAddress })
    {
        using (var response = await httpClient.GetAsync(&quot;user/list{?organizationId}&quot;))
        {
            string responseData = await response.Content.ReadAsStringAsync();
        }
    }

In this and some other methods, I need to have a header with a token that I get before.

Here&#39;s an image of Postman (chrome extension) with the header I&#39;m talking about:
![enter image description here][1]

How do I add that Authorization header to the request?

  [1]: http://i.stack.imgur.com/UE43N.png

Adding headers when using httpClient.GetAsync

I&#39;m trying to get content of HttpResponseMessage. It should be: `{&quot;message&quot;:&quot;Action &#39;&#39; does not exist!&quot;,&quot;success&quot;:false}`, but I don&#39;t know, how to get it out of HttpResponseMessage.

    HttpClient httpClient = new HttpClient();
    HttpResponseMessage response = await httpClient.GetAsync(&quot;http://****?action=&quot;);
    txtBlock.Text = Convert.ToString(response); //wrong!

In this case txtBlock would have value:

    StatusCode: 200, ReasonPhrase: &#39;OK&#39;, Version: 1.1, Content: System.Net.Http.StreamContent, Headers:
    {
      Vary: Accept-Encoding
      Keep-Alive: timeout=15, max=100
      Connection: Keep-Alive
      Date: Wed, 10 Apr 2013 20:46:37 GMT
      Server: Apache/2.2.16
      Server: (Debian)
      X-Powered-By: PHP/5.3.3-7+squeeze14
      Content-Length: 55
      Content-Type: text/html
    }

Getting content/message from HttpResponseMessage

Seems as though an update on Windows 10 overnight broke Python. Just trying to run `python --version` returned a &quot;Permission Denied&quot; error.  None of the three updates; KB4507453, KB4506991, or KB4509096 look like they&#39;d be the culprit but the timing of the issue is suspicious. Rather than messing with rolling back, I&#39;m hoping there&#39;s a simpler fix that I&#39;m missing.

The permissions on python are &quot;-rwxr-xr-x&quot; and I haven&#39;t changed anything besides letting the Windows update reboot machine after installing last night&#39;s patches.

According to the System Information, I&#39;m running 10.0.18362

Should also note that this is happening whether I (try) to execute Python from git-bash using &quot;run as administrator&quot; or not, and if I try using PowerShell, it just opens the Windows store as if the app isn&#39;t installed so I&#39;m thinking it can&#39;t see the contents of my `/c/Users/david/AppData/Local/Microsoft/WindowsApps/` folder for some reason.

I&#39;ve also tried to reinstall Python 3.7.4, but that didn&#39;t help either. Is there something else I should be looking at?

&quot;Permission Denied&quot; trying to run Python on Windows 10

In my C#/XAML metro app, there&#39;s a button which kicks off a  long-running process. So, as recommended, I&#39;m using async/await to make sure the UI thread doesn&#39;t get blocked:

    private async void Button_Click_1(object sender, RoutedEventArgs e) 
    {
         await GetResults();
    }
    
    private async Task GetResults()
    { 
         // Do lot of complex stuff that takes a long time
         // (e.g. contact some web services)
      ...
    }

Occasionally, the stuff happening within GetResults would require additional user input before it can continue. For simplicity, let&#39;s say the user just has to click a &quot;continue&quot; button.

My question is: **how can I suspend the execution of GetResults in such a way that it awaits an *event* such as the click of another button?**

Here&#39;s an ugly way to achieve what I&#39;m looking for: the event handler for the continue&quot; button sets a flag...

    private bool _continue = false;
    private void buttonContinue_Click(object sender, RoutedEventArgs e)
    {
        _continue = true;
    }

... and GetResults periodically polls it:

     buttonContinue.Visibility = Visibility.Visible;
     while (!_continue) await Task.Delay(100);  // poll _continue every 100ms
     buttonContinue.Visibility = Visibility.Collapsed;

The polling is clearly terrible (busy waiting / waste of cycles) and I&#39;m looking for something event-based.
 
Any ideas?

Btw in this simplified example, one solution would be of course to split up GetResults() into two parts, invoke the first part from the start button and the second part from the continue button. In reality, the stuff happening in GetResults is more complex and different types of user input can be required at different points within the execution. So breaking up the logic into multiple methods would be non-trivial.








Is it possible to await an event instead of another async method?

[Thread.Sleep][1] doesn&#39;t seem to be supported in .NET for Windows Store apps. 

For example, this

    System.Threading.Thread.Sleep(1000);

will compile when targeting any .NET Framework (2.0, 3.5, 4.0, 4.5), but not when targeting .NET for Windows Store apps (or in a portable class library which targets both 4.5 and store).

System.Threading.Thread is still there, it just doesn&#39;t have the Sleep method.


I need to delay something for a few seconds in my app, is there a suitable replacement? 

EDIT why the delay is needed: My app is a game and the delay is to make it look like the computer opponent is &quot;thinking&quot; about his next move. The method is already called asynchronously (main thread isn&#39;t blocked), I just want to slow the response time down.


  [1]: http://msdn.microsoft.com/en-us/library/d00bd51t.aspx

Thread.Sleep replacement in .NET for Windows Store

I&#39;m building a Windows Store app, and I have some code that needs to be posted to the UI thread.

For that, i&#39;d like to retrieve the CoreDispatcher and use it to post the code.

It seems that there are a few ways to do so:

    // First way
    Windows.ApplicationModel.Core.CoreApplication.GetCurrentView().CoreWindow.Dispatcher;
    
    // Second way
    Window.Current.Dispatcher;


I wonder which one is correct? or if both are equivalent?

Correct way to get the CoreDispatcher in a Windows Store app

**Preface**: I&#39;m looking for an explanation, not just a solution. I already know the solution.

Despite having spent several days studying MSDN articles about the Task-based Asynchronous Pattern (TAP), async and await, I&#39;m still a bit confused about some of the finer details.

I&#39;m writing a logger for Windows Store Apps, and I want to support both asynchronous and synchronous logging. The asynchronous methods follow the TAP, the synchronous ones should hide all this, and look and work like ordinary methods.

This is the core method of asynchronous logging:

    private async Task WriteToLogAsync(string text)
    {
        StorageFolder folder = ApplicationData.Current.LocalFolder;
        StorageFile file = await folder.CreateFileAsync(&quot;log.log&quot;,
            CreationCollisionOption.OpenIfExists);
        await FileIO.AppendTextAsync(file, text,
            Windows.Storage.Streams.UnicodeEncoding.Utf8);
    }

Now the corresponding synchronous method...

**Version 1**:

    private void WriteToLog(string text)
    {
        Task task = WriteToLogAsync(text);
        task.Wait();
    }

This looks correct, but it does not work. The whole program freezes forever.

**Version 2**:

Hmm.. Maybe the task was not started?

    private void WriteToLog(string text)
    {
        Task task = WriteToLogAsync(text);
        task.Start();
        task.Wait();
    }

This throws `InvalidOperationException: Start may not be called on a promise-style task.`

**Version 3:**

Hmm.. `Task.RunSynchronously` sounds promising.

    private void WriteToLog(string text)
    {
        Task task = WriteToLogAsync(text);
        task.RunSynchronously();
    }

This throws `InvalidOperationException: RunSynchronously may not be called on a task not bound to a delegate, such as the task returned from an asynchronous method.`

**Version 4 (the solution):**

    private void WriteToLog(string text)
    {
        var task = Task.Run(async () =&gt; { await WriteToLogAsync(text); });
        task.Wait();
    }

This works. So, 2 and 3 are the wrong tools. But 1? What&#39;s wrong with 1 and what&#39;s the difference to 4? What makes 1 cause a freeze? Is there some problem with the task object? Is there a non-obvious deadlock?

Synchronously waiting for an async operation, and why does Wait() freeze the program here

I am trying to get my head round the new Windows 8 Runtime that is used to create [Metro][1] style apps. I know you can use it with [XAML][2] and it is based on .NET so C# and VB.NET can be used to write the apps, but then it seems to have something to do with HTML, CSS, DOM, and JavaScript.

Can someone explain what it is in a few paragraphs, in terms that a .NET UI programmer can understand? (I am missing something “key” that is necessary to understand it.)

----------

We all know that WPF, [Silverlight][3], [Windows Forms][4], etc. will keep working under Windows&amp;nbsp;8 (and Windows&amp;nbsp;10) on at least on Intel systems, so please don&#39;t tell me that...

  [1]: https://en.wikipedia.org/wiki/Metro_%28design_language%29
  [2]: http://en.wikipedia.org/wiki/Extensible_Application_Markup_Language
  [3]: http://en.wikipedia.org/wiki/Microsoft_Silverlight
  [4]: http://en.wikipedia.org/wiki/Windows_Forms


How does Windows 8 Runtime (WinRT / Windows Store apps / Windows 10 Universal App) compare to Silverlight and WPF?

I&#39;m trying to sign a Windows 8 appx package with a pfx file I have. I&#39;m using a command like so:

    signtool.exe sign /fd sha256 /f &quot;key.pfx&quot; &quot;app.appx&quot;

And from this, I get:

&gt; SignTool Error: No certificates were found that met all the given criteria.

What &quot;criteria&quot; am I not meeting? This is only for testing so these are self-signed certificates. I&#39;ve tried importing the key and then signing it, but it always results in the same error. How do I fix this? 


Signtool error: No certificates were found that met all given criteria with a Windows Store App?

I&#39;ve got a c# Windows Store app. I&#39;m trying to launch a `MessageDialog` when one of the command buttons inside another `MessageDialog` is clicked. The point of this is to warn the user that their content is unsaved, and if they click cancel, it will prompt them to save using a separate save dialog. 

Here&#39;s my &quot;showCloseDialog&quot; function: 

    private async Task showCloseDialog()
    {
        if (b_editedSinceSave)
        {
            var messageDialog = new MessageDialog(&quot;Unsaved work detected. Close anyway?&quot;, &quot;Confirmation Message&quot;);

            messageDialog.Commands.Add(new UICommand(&quot;Yes&quot;, (command) =&gt;
            {
                // close document
                editor.Document.SetText(TextSetOptions.None, &quot;&quot;);
            }));

            messageDialog.Commands.Add(new UICommand(&quot;No&quot;, (command) =&gt;
            {
                // save document
                await showSaveDialog();
            }));

            messageDialog.DefaultCommandIndex = 1;
            await messageDialog.ShowAsync();
        }
    }

In VS I get a compiler error:

&gt;The &#39;await&#39; operator can only be used within an async lambda expression. Consider marking this lambda expression with the &#39;async&#39; modifier`

The method is marked with `await`. If I remove `await` from before showSaveDialog, it compiles (and works) but I get a warning that I really should use `await`

How do I use `await` in this context? 

The &#39;await&#39; operator can only be used within an async lambda expression

I keep hitting this problem when I try to debug my Windows 8 apps and there is a copy already installed on another user account:

&gt; DEP0700 : Registration of the app failed. Another user has already installed a packaged version of this app. An unpackaged version cannot replace this. The conflicting package is {{{PackageName}}} and it was published by CN={{{Certificate Stuff}}}. (0x80073cf9)

Sometimes I can just log in or ask someone else to log in to the machine and uninstall the app. Alternatively I can change the application name/id, but one is not always possible and the other is risky (I don&#39;t want to check in the changed application id to source control).

There must be some way to uninstall it. Maybe a PowerShell script?

How to uninstall an app that another user installed?

I&#39;m revamping my software which has messy `Messenger.Default(...)` bits.

Is there any cheat sheet to know MVVMLight SimpleIoc usage (not general IoC description)?

how to use MVVMLight SimpleIoc?

So, first I have read a ton of threads on this particular problem and I still do not understand how to fix it. Basically, I am trying to communicate with a websocket and store the message received in an observable collection that is bound to a listview. I know that I am getting a response back properly from the socket, but when it tries to add it to the observable collection it gives me the following error:

    The application called an interface that was marshalled for a different thread. (Exception from HRESULT: 0x8001010E (RPC_E_WRONG_THREAD))

I&#39;ve read some information on &quot;dispatch&quot; as well as some other things, but I am just massively confused! Here is my code:

    public ObservableCollection&lt;string&gt; messageList  { get; set; }
    private void MessageReceived(MessageWebSocket sender, MessageWebSocketMessageReceivedEventArgs args)
        {
            string read = &quot;&quot;;
            try
            {
                using (DataReader reader = args.GetDataReader())
                {
                    reader.UnicodeEncoding = Windows.Storage.Streams.UnicodeEncoding.Utf8;
                    read = reader.ReadString(reader.UnconsumedBufferLength);
                }
            }
            catch (Exception ex) // For debugging
            {
                WebErrorStatus status = WebSocketError.GetStatus(ex.GetBaseException().HResult);
                // Add your specific error-handling code here.
            }
    
            
            if (read != &quot;&quot;)
               messageList.Add(read); // this is where I get the error
    
        }

And this is the binding:

    protected override async void OnNavigatedTo(NavigationEventArgs e)
    {
        //await Authenticate();
        Gameboard.DataContext = Game.GameDetails.Singleton;
        lstHighScores.ItemsSource = sendInfo.messageList;
    }

How do I make the error go away while still binding to the observable collection for my listview?

The application called an interface that was marshalled for a different thread - Windows Store App

I am setting up a button via JavaScript, but the button doesn&#39;t show the text.

Any recommendations on how to fix it?

    var b = document.createElement(&#39;button&#39;);
    b.setAttribute(&#39;content&#39;, &#39;test content&#39;);
    b.setAttribute(&#39;class&#39;, &#39;btn&#39;);
    b.value = &#39;test value&#39;;

    var wrapper = document.getElementById(divWrapper);
    wrapper.appendChild(b);


All Windows Store-Apps Solutions on Gang of Coders

Total of 16 Windows Store-Apps Solutions