Double click on the Package.appxmanifest file in your project. &lt;br&gt;Click on the &quot;Capabilities&quot; tab. Add the Private Networks capability to your project.

I want to send a `PING` to Redis to check if the connection is working, now I could just install `redis-cli`, but I don&#39;t want to and `curl` is already there. So how can I abuse `curl` to do that? Basically I need to turn off what&#39;s send here:

    &gt; GET / HTTP/1.1
    &gt; User-Agent: curl/7.22.0 (x86_64-pc-linux-gnu) libcurl/7.22.0 OpenSSL/1.0.1 zlib/1.2.3.4 libidn/1.23 librtmp/2.3
    &gt; Host: localhost:6379
    &gt; Accept: */*
    &gt; 
    -ERR wrong number of arguments for &#39;get&#39; command
    -ERR unknown command &#39;User-Agent:&#39;
    -ERR unknown command &#39;Host:&#39;
    -ERR unknown command &#39;Accept:&#39;

I was able to get rid of the `User-Agent` altogether by adding `-A &quot;&quot;`, but I can&#39;t find anything else for the rest. Any idea how I can do that?

Abuse cURL to communicate with Redis

While using RxJava and Retrofit 2 I am trying to create Unit Tests to cover when my app receives specific responses.

The issue I have is that with Retrofit 2 I cannot see a nice way of creating a retrofit.Response object without the use of reflection.

    @Test
    public void testLogin_throwsLoginBadRequestExceptionWhen403Error() {


        Request.Builder requestBuilder = new Request.Builder();
        requestBuilder.get();
        requestBuilder.url(&quot;http://localhost&quot;);

        Response.Builder responseBuilder = new Response.Builder();
        responseBuilder.code(403);
        responseBuilder.protocol(Protocol.HTTP_1_1);
        responseBuilder.body(ResponseBody.create(MediaType.parse(&quot;application/json&quot;), &quot;{\&quot;key\&quot;:[\&quot;somestuff\&quot;]}&quot;));
        responseBuilder.request(requestBuilder.build());

        retrofit.Response&lt;LoginResponse&gt; aResponse = null;

        try {
            Constructor&lt;retrofit.Response&gt; constructor= (Constructor&lt;retrofit.Response&gt;) retrofit.Response.class.getDeclaredConstructors()[0];
            constructor.setAccessible(true);
            aResponse = constructor.newInstance(responseBuilder.build(), null, null);
        } catch (Exception ex) {
            //reflection error
        }

        doReturn(Observable.just(aResponse)).when(mockLoginAPI).login(anyObject());

        TestSubscriber testSubscriber = new TestSubscriber();
        loginAPIService.login(loginRequest).subscribe(testSubscriber);

        Throwable resultError = (Throwable) testSubscriber.getOnErrorEvents().get(0);
        assertTrue(resultError instanceof LoginBadRequestException);
    }

I have tried using the following but this creates an OkHttp Response vs a Retrofit Response.

        Request.Builder requestBuilder = new Request.Builder();
        requestBuilder.get();
        requestBuilder.url(&quot;http://localhost&quot;);

        Response.Builder responseBuilder = new Response.Builder();
        responseBuilder.code(403);
        responseBuilder.protocol(Protocol.HTTP_1_1);

How to create a retrofit.Response object during Unit Testing with Retrofit 2

I&#39;m trying to implement REST client in Universal Windows project (in Windows 10 universal app) using HttpClient, but the following line:

    var response = _client.GetAsync(address).Result;

throws an AggregateException with the following message:

&gt; Access denied. A network capability is required to access this
&gt; network resource

 More surprisingly, the request isn&#39;t event sent to server. How can I solve this problem?

Universal Windows project - HttpClient exception

I'm trying to implement REST client in Universal Windows project (in Windows 10 universal app) using HttpClient, but the following line:
<pre><code class="hljs language-ini">var response = _client.GetAsync(address).Result;
</code></pre>
throws an AggregateException with the following message:
> Access denied. A network capability is required to access this
> network resource
More surprisingly, the request isn't event sent to server. How can I solve this problem?

C# 6 brings compiler support for interpolated string literals with syntax:

    var person = new { Name = &quot;Bob&quot; };

    string s = $&quot;Hello, {person.Name}.&quot;;

This is great for short strings, but if you want to produce a longer string must it be specified on a single line?

With other kinds of strings you can:

        var multi1 = string.Format(@&quot;Height: {0}
    Width: {1}
    Background: {2}&quot;,
            height,
            width,
            background);

Or:

    var multi2 = string.Format(
        &quot;Height: {1}{0}&quot; +
        &quot;Width: {2}{0}&quot; +
        &quot;Background: {3}&quot;,
        Environment.NewLine,
        height,
        width,
        background);

I can&#39;t find a way to achieve this with string interpolation without having it all one one line:

    var multi3 = $&quot;Height: {height}{Environment.NewLine}Width: {width}{Environment.NewLine}Background: {background}&quot;;

I realise that in this case you could use `\r\n` in place of `Environment.NewLine` (less portable), or pull it out to a local, but there will be cases where you can&#39;t reduce it below one line without losing semantic strength.

Is it simply the case that string interpolation should not be used for long strings?

Should we just string using `StringBuilder` for longer strings?

    var multi4 = new StringBuilder()
        .AppendFormat(&quot;Width: {0}&quot;, width).AppendLine()
        .AppendFormat(&quot;Height: {0}&quot;, height).AppendLine()
        .AppendFormat(&quot;Background: {0}&quot;, background).AppendLine()
        .ToString();

Or is there something more elegant?

Multiline C# interpolated string literal

I have the following errors (and more) in all my views (*.cshtml) when opening my project in Visual Studio 2015 Professional.

&gt;Error	CS0246	The type or namespace name &#39;System&#39; could not be found (are you missing a using directive or an assembly reference?)
Severity	Code	Description	Project	File	Line

&gt;Error	CS0518	Predefined type &#39;System.Object&#39; is not defined or imported
Severity	Code	Description	Project	File	Line

&gt;Error	CS0518	Predefined type &#39;System.String&#39; is not defined or imported


I got these references:

    &lt;ItemGroup&gt;
    &lt;Reference Include=&quot;Microsoft.CSharp&quot; /&gt;
    &lt;Reference Include=&quot;Sitecore.Kernel, Version=7.0.0.0, Culture=neutral, processorArchitecture=MSIL&quot;&gt;
      &lt;SpecificVersion&gt;False&lt;/SpecificVersion&gt;
      &lt;HintPath&gt;N:\XXX\Sitecore.Kernel.dll&lt;/HintPath&gt;
    &lt;/Reference&gt;
    &lt;Reference Include=&quot;Sitecore.Mvc&quot;&gt;
      &lt;HintPath&gt;N:\XXX\Sitecore.Mvc.dll&lt;/HintPath&gt;
    &lt;/Reference&gt;
    &lt;Reference Include=&quot;System.Web.DynamicData&quot; /&gt;
    &lt;Reference Include=&quot;System.Web.Entity&quot; /&gt;
    &lt;Reference Include=&quot;System.Web.ApplicationServices&quot; /&gt;
    &lt;Reference Include=&quot;System.ComponentModel.DataAnnotations&quot; /&gt;
    &lt;Reference Include=&quot;System&quot; /&gt;
    &lt;Reference Include=&quot;System.Data&quot; /&gt;
    &lt;Reference Include=&quot;System.Core&quot; /&gt;
    &lt;Reference Include=&quot;System.Data.DataSetExtensions&quot; /&gt;
    &lt;Reference Include=&quot;System.Web.Extensions&quot; /&gt;
    &lt;Reference Include=&quot;System.Web.Helpers, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL&quot;&gt;
      &lt;SpecificVersion&gt;False&lt;/SpecificVersion&gt;
      &lt;HintPath&gt;N:\XXX\System.Web.Helpers.dll&lt;/HintPath&gt;
    &lt;/Reference&gt;
    &lt;Reference Include=&quot;System.Web.Mvc, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL&quot;&gt;
      &lt;SpecificVersion&gt;False&lt;/SpecificVersion&gt;
      &lt;HintPath&gt;N:\XXX\System.Web.Mvc.dll&lt;/HintPath&gt;
    &lt;/Reference&gt;
    &lt;Reference Include=&quot;System.Web.Providers&quot;&gt;
      &lt;HintPath&gt;N:\XXX\System.Web.Providers.dll&lt;/HintPath&gt;
    &lt;/Reference&gt;
    &lt;Reference Include=&quot;System.Web.Razor, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL&quot;&gt;
      &lt;SpecificVersion&gt;False&lt;/SpecificVersion&gt;
      &lt;HintPath&gt;N:\XXX\System.Web.Razor.dll&lt;/HintPath&gt;
    &lt;/Reference&gt;
    &lt;Reference Include=&quot;System.Web.WebPages, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL&quot;&gt;
      &lt;SpecificVersion&gt;False&lt;/SpecificVersion&gt;
      &lt;HintPath&gt;N:\XXX\System.Web.WebPages.dll&lt;/HintPath&gt;
    &lt;/Reference&gt;
    &lt;Reference Include=&quot;System.Web.WebPages.Deployment, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL&quot;&gt;
      &lt;SpecificVersion&gt;False&lt;/SpecificVersion&gt;
      &lt;HintPath&gt;N:\XXX\System.Web.WebPages.Deployment.dll&lt;/HintPath&gt;
    &lt;/Reference&gt;
    &lt;Reference Include=&quot;System.Web.WebPages.Razor, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL&quot;&gt;
      &lt;SpecificVersion&gt;False&lt;/SpecificVersion&gt;
      &lt;HintPath&gt;N:\XXX\System.Web.WebPages.Razor.dll&lt;/HintPath&gt;
    &lt;/Reference&gt;
    &lt;Reference Include=&quot;System.Xml.Linq&quot; /&gt;
    &lt;Reference Include=&quot;System.Drawing&quot; /&gt;
    &lt;Reference Include=&quot;System.Web&quot; /&gt;
    &lt;Reference Include=&quot;System.Xml&quot; /&gt;
    &lt;Reference Include=&quot;System.Configuration&quot; /&gt;
    &lt;Reference Include=&quot;System.Web.Services&quot; /&gt;
    &lt;Reference Include=&quot;System.EnterpriseServices&quot; /&gt;
  &lt;/ItemGroup&gt;


I found some solutions saying that a mscorlib wasn&#39;t referenced.. but when I tried to add it it sayd that it&#39;s already there (even though I don&#39;t see it on the csproj file).

System.dll reference:

[![enter image description here][1]][1]

[![enter image description here][2]][2]


  [1]: http://i.stack.imgur.com/B2fEv.jpg
  [2]: http://i.stack.imgur.com/A9ojv.jpg


**SOLUTION:** 

Managed the issue.. I had the build path set to a &quot;c:\...\bin&quot; instead of &quot;\bin&quot;. I believe this happened because I don&#39;t have any web.config in the root of the project, so VS didn&#39;t identify my project as a web project.

The type or namespace name &#39;System&#39; could not be found

It&#39;s a WebApi project using VS2015.

Step to reproduce: 
 
 1. Create an empty WebApi project
 2. Change Build output path from &quot;bin\&quot; to &quot;bin\Debug\&quot;
 3. Run
  
[![enter image description here][1]][1]

Everything is working perfectly until I changed Build Output path from &quot;bin\&quot; to &quot;bin\Debug\&quot; 
In fact, any Output path other than &quot;bin\&quot; won&#39;t work.

One little additional thing is that, having another output path to anywhere would work as long as I left a build in &quot;bin\&quot;. 

Please help providing solution to solve this. 
I guess that&#39;ll cost problem on actual deployment.


  [1]: http://i.stack.imgur.com/xbBFo.gif

The CodeDom provider type &quot;Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider&quot; could not be located

It seems that there is no dynamic bundling supported in the new MVC ([link][1]), and it should be done using a gulp task. MVC supports some new attribute called `asp-append-version`, but I have not found any explanation on how it works. I suspect that it&#39;s calculating some hash of the file contents and even updates it after a file change. Is there any documentation on how it works?

I am also wondering how it detects the file changes or whether it just recalculates the hash each time the MVC parses razor markup.


  [1]: https://stackoverflow.com/questions/32155362/migrating-asp-net-mvc-5-bundling-versions-to-mvc-6

How does javascript version (asp-append-version) work in ASP.NET Core MVC?

I have updated my project from .NET 4.5 to .NET Core (with ASP.NET Core). I had some very simple code in my previous version that used the bitmap object from `System.Drawing` to resize an image.

As I understand `System.Drawing` cannot be used in .NET Core because it is not cross platform, but what can be used instead?

I have googled this and cannot find anything.  The only thing I can find is [this][1] post, which has no code on it what so ever.


  [1]: https://github.com/imazen/Graphics-vNext

Manipulating images with .NET Core

I recently renamed my root TFS folder from `D:\TFS\systemstfs` to `D:\TFS\sys` because one of the project&#39;s paths was too long for Windows. Now, when I attempt to run a different project (D:\TFS\sys\companydomain.com\Dev\Flowers\wsBusinessLayer) in VS2013 using IIS Express (Project URL http://localhost:59729/Flowers/wsBusinessLayer/) I get the following error message in the browser:

&gt; HTTP Error 500.19 - Internal Server Error  
The requested page cannot be accessed because the related configuration data for the page is invalid.

&gt; Module - IIS Web Core  
Notification - BeginRequest  
Error Code - 0x80070003  
Config Error - Cannot read configuration file  
Config File - \\?\D:\TFS\\**systemstfs**\companydomain.com\Dev\Flowers\web.config  
Requested URL - http://localhost:59729/Flowers/wsBusinessLayer/InformationServices.asmx  
Physical Path - D:\TFS\\**sys**\companydomain.com\Dev\Flowers\wsBusinessLayer\InformationServices.asmx

(emphasis mine, D: is the second HDD on my machine, not a network share)

It&#39;s clear to me what the problem is (the config file path is wrong) but I have no idea how to fix it. I have tried:

- Enabling &quot;break on CLR exceptions when thrown&quot;
- Re-getting the solution from TFS
- Rebooting
- Switching to use IIS and then back to Express
- Googling 500.19, 0x80070003, wrong path, cannot read configuration file, and various combinations of those terms

But have had no luck. Has anyone come across this before?

IIS Express - 500.19 Cannot read configuration file - because it&#39;s looking at the wrong path

I am trying to save a date from my Angular ui-Datepicker to my SQL database.  The date is in the format (10-27-2015 12:00 AM) but it will not save.  I tried using the following to convert it to SQL DateTime format:

        DateTime? myDate = form.dteStartDate;
        string sqlFormattedDate = myDate.ToString(&quot;yyyy-MM-dd HH:mm:ss&quot;);

But I receive the error &quot;No overload for method &#39;ToString&#39; takes 1 arguments.  The field in SQL is type &#39;datetime&#39;.

Any assistance is greatly appreciated.

No overload for method &#39;ToString&quot; takes 1 arguments when casting date

In C++ it&#39;s actually possible to throw an exception by value without allocating memory on a heap, so this situation makes sense. But in .NET framework `OutOfMemoryException` is a reference type, therefore it is allocated on a heap. 
How does .NET framework allocates memory for `OutOfMemoryException` when there is not enough memory to create a new object?

How does .NET framework allocate memory for OutOfMemoryException?

I am publishing my ASP.NET 5 MVC6 project from Visual Studio 2015. I have imported publish profile from my server. Connection validates successfully, however when I publish my project I have the following error:

ERROR_CERTIFICATE_VALIDATION_FAILED

&gt; Connected to the remote computer (&quot;XXXXXXXXX&quot;) using the specified
&gt; process (&quot;Web Management Service&quot;), but could not verify the server&#39;s
&gt; certificate. If you trust the server, connect again and allow
&gt; untrusted certificates.

There is no option to allow untrusted certificates in publishing settings. 

Publishing from Visual Studio 2015 - allow untrusted certificates

I tried to open `kernel32.dll` using Dependency Walker on Windows 10. I got the following error and warning:

&gt;Error: At least one required implicit or forwarded dependency was not found
&gt;
&gt;Warning: At least one delay-load dependency module was not found.

Screenshot:
[![Error reading dependency][1]][1]


I&#39;m running Windows 10 32-bit, and the Dependency Walker is also 32-bit.
Also, I&#39;m running Dependency Walker as admin.


  [1]: https://i.stack.imgur.com/HsqV3.png

Dependency Walker with kernel32.dll on Windows 10

I upgraded my Windows 10 to the last update yesterday and now, when I launch  `vagrant up` command, I get this error :

    ==&gt; default: Booting VM...
    ==&gt; default: Waiting for machine to boot. This may take a few minutes...
    The guest machine entered an invalid state while waiting for it
    to boot. Valid states are &#39;starting, running&#39;. The machine is in the
    &#39;poweroff&#39; state. Please verify everything is configured
    properly and try again.
    
    If the provider you&#39;re using has a GUI that comes with it,
    it is often helpful to open that and watch the machine, since the
    GUI often has more helpful error messages than Vagrant can retrieve.
    For example, if you&#39;re using VirtualBox, run `vagrant up` while the
    VirtualBox GUI is open.
    
    The primary issue for this error is that the provider you&#39;re using
    is not properly configured. This is very rarely a Vagrant issue.

When I try with GUI I have this error :

    Failed to open/create the internal network &#39;HostInterfaceNetworking-VirtualBox Host-Only Ethernet Adapter&#39; (VERR_INTNET_FLT_IF_NOT_FOUND).
    Failed to attach the network LUN (VERR_INTNET_FLT_IF_NOT_FOUND).

I have re-installed VirtualBox 5.0.10 and the extension pack,
reconfigured Host-Only Ethernet Adapter, but always the same error...

Any ideas?

Failed to open/create the internal network Vagrant on Windows10

I&#39;m adding this question after spending an entire day wrestling with this incredibly frustrating feature of the Windows 10 command prompt which made me think there was something wrong with my console application code. I hope it will help someone.

Issue: My console application seems to randomly stop running. What is going on?


Why is my command prompt freezing on Windows 10?

I&#39;ve used Vagrant for a while on a windows 7 system. Now I&#39;ve a new PC with windows 10. I installed Oracle Virtual Box and Vagrant and I try to start a machine with the command vagrant up.
The Vagrantfile is the same file that I used on my windows 7 system.
This is the content of the Vagrantfile:

    Vagrant.configure(2) do |config|
    config.vm.box = &quot;debian/jessie64&quot;

    config.vm.provider &quot;virtualbox&quot; do |v|
        v.customize [&quot;modifyvm&quot;, :id, &quot;--memory&quot;, &quot;768&quot;]
    end
    config.vm.provision :shell, path: &quot;bootstrap.sh&quot;

    config.vm.network :private_network, ip: &quot;172.27.146.17&quot;
    config.vm.hostname = &quot;www.delevensstijl.hst1.nl&quot;
    config.hostsupdater.aliases = [&quot;www.thelifestylemethod.hst1.nl&quot;]

    end

[![this is the error i get][1]][1]


  [1]: http://i.stack.imgur.com/uDah3.gif

The error I get: &quot;rsync&quot; could not be found on your PATH. Make sure that rsync is properly installed on your system and available on the PATH.

Why is Vagrant looking for rsync since I use Virtualbox?
How can I workaround this error?

Vagrant with VirtualBox on Windows10: &quot;Rsync&quot; could not be found on your PATH

Learning debugging in PhpStorm and keep accidentally hitting &lt;kbd&gt;Ctrl&lt;/kbd&gt; + &lt;kbd&gt;Alt&lt;/kbd&gt; + &lt;kbd&gt;F8&lt;/kbd&gt;. I use 3 displays this disconnects the two remotes and goes back to just the laptop.

I cannot see this documented anywhere (running Win 10).

The worst part is that hitting the combination again does NOT reconnect the displays. 

Anyone know either:

* combination to reverse the effect - IE reconnect displays

* how I can stop it or 

* a tool that will help me find out where it is firing from (motherboard/Windows/Intel/nVidia/USB monitor driver - goodness knows where).

Grateful for a helping hand. &lt;kbd&gt;F8&lt;/kbd&gt; in various combinations are the debugging shortcuts for PhpStorm and I keep hitting &lt;kbd&gt;Ctrl&lt;/kbd&gt; + &lt;kbd&gt;Alt&lt;/kbd&gt; + &lt;kbd&gt;F8&lt;/kbd&gt; accidentally. I am about to throw a monitor out of the window. 

EDIT Apologies. When I posted this it said &lt;kbd&gt;Ctrl&lt;/kbd&gt; + &lt;kbd&gt;Shift &lt;/kbd&gt; + &lt;kbd&gt;F8&lt;/kbd&gt; in error. Hope did not confuse anyone.

Oops misremembered my own post!.

Ctrl Alt F8 disconnects displays?

I&#39;m using `Page` as landing screen in my app. XAML looks like this:

    &lt;Grid x:Name=&quot;LayoutRoot&quot;&gt;

        &lt;Grid&gt;
            &lt;Grid.RowDefinitions&gt;
                &lt;RowDefinition Height=&quot;3*&quot;/&gt;
                &lt;RowDefinition Height=&quot;Auto&quot;/&gt;
                &lt;RowDefinition Height=&quot;Auto&quot;/&gt;
                &lt;RowDefinition Height=&quot;7*&quot;/&gt;
            &lt;/Grid.RowDefinitions&gt;

            &lt;Rectangle StrokeThickness=&quot;0&quot; Fill=&quot;#FF79D2F4&quot; Margin=&quot;0,0,0,-10&quot; Grid.RowSpan=&quot;2&quot;/&gt;

            &lt;Rectangle StrokeThickness=&quot;0&quot; Fill=&quot;#FF1F8CC5&quot; Margin=&quot;0,-10,0,0&quot; Grid.Row=&quot;2&quot; Grid.RowSpan=&quot;2&quot;/&gt;

            &lt;Image Source=&quot;ms-appx:///Assets/ViewMedia/Banners/Banner_Light_Big.jpg&quot; Grid.Row=&quot;1&quot; Grid.RowSpan=&quot;2&quot;/&gt;

            &lt;Rectangle StrokeThickness=&quot;0&quot; Grid.Row=&quot;2&quot; Grid.RowSpan=&quot;2&quot;&gt;
                &lt;Rectangle.Fill&gt;
                    &lt;LinearGradientBrush EndPoint=&quot;0.5,1&quot; StartPoint=&quot;0.5,0&quot;&gt;
                        &lt;GradientStop Offset=&quot;0&quot;/&gt;
                        &lt;GradientStop Color=&quot;#7F000000&quot; Offset=&quot;1&quot;/&gt;
                    &lt;/LinearGradientBrush&gt;
                &lt;/Rectangle.Fill&gt;
            &lt;/Rectangle&gt;

        &lt;/Grid&gt;

        &lt;StackPanel MaxWidth=&quot;300&quot; Margin=&quot;20,35&quot;
                    HorizontalAlignment=&quot;Stretch&quot; VerticalAlignment=&quot;Bottom&quot;&gt;

            &lt;Button x:Name=&quot;LoginButton&quot; x:Uid=&quot;LoginButton&quot; Style=&quot;{StaticResource BrandButtonStyle}&quot; Margin=&quot;0,5&quot;
                    Click=&quot;LoginButton_Click&quot;/&gt;

            &lt;Button x:Name=&quot;RegisterButton&quot; x:Uid=&quot;RegisterButton&quot; Style=&quot;{StaticResource BrandButtonStyle}&quot; Margin=&quot;0,5&quot;
                    Click=&quot;RegisterButton_Click&quot;/&gt;

        &lt;/StackPanel&gt;

    &lt;/Grid&gt;
    
I&#39;ve got 3 devices on which I&#39;m running the app:

 - Microsoft Lumia 950 XL [**M**]
 - Custom build PC [**PC**]
 - Lenovo ThinkPad Tablet 2 [**T**]

When running the app this page renders well on **M** and **PC** but on **T** `Gradient` and two `Button`s at the bottom are not rendered at all. I don&#39;t see them but I can press `Button`s and their tap event handlers will strike. But if I comment `Rectangle` with gradient everything is fine on all devices.

This is how the app looks on **T** when using gradient. No buttons. And gradient is also not visible.
[![With gradient][1]][1]

This is how the app looks on **T** without gradient. Buttons are in place.
[![Without gradient][2]][2]

And this is how it should look running on **PC**. Buttons and gradient are visible.
[![This is how it should look][3]][3]

I don&#39;t see any errors in output when running the app. I don&#39;t know why this happens only on specific devices. Maybe this is kind of known issue?


**UPDATE 1**

From users feedback, I can say that this bug hits only Atom-powered devices. But I&#39;m not sure if this is 100% true for all Atom-powered devices.


**UPDATE 2**

I&#39;d updated **T** with W10 from Insider Preview Fast Ring. The bug is in place. So this is not connected to OS builds.

**UPDATE 3**

Switching `Button`s `Style` back to normal does not solve this. So `Style` is good, it&#39;s not the cause.

  [1]: http://i.stack.imgur.com/RrLtW.png
  [2]: http://i.stack.imgur.com/wo1Oi.png
  [3]: http://i.stack.imgur.com/symt8.png

XAML gradient issue in UWP for some devices

How do I remove the box with the 3 icons when debugging?

[![enter image description here][1]][1]


  [1]: http://i.stack.imgur.com/rhlua.png

How to remove the &quot;Go to live visual tree&quot; / &quot;Enable selection&quot; / &quot;Display layout adorners&quot; overlay when debugging?

What to use in UWP, `Binding` or `x:Bind` and what is the difference between them?

Because I see a lot of posts where people use `Binding` and I only Bind with `x:Bind` in UWP.

At the MSDN Homepage it only says that &quot;the binding objects created by `{x:Bind}` and `{Binding}` are largely functionally equivalent.&quot; and that `x:Bind` is **faster**. 

**But what is the difference between them?** 

Because &quot;largely functionally equivalent&quot; does not mean equivalent.

The Link from my Quote: [MSDN][1]

**So my Question is:**

What is the difference in using Binding or x:Bind in UWP?

  [1]: https://msdn.microsoft.com/en-us/windows/uwp/xaml-platform/x-bind-markup-extension

Difference between Binding and x:Bind

I&#39;ve heard of

* .Net Core
* .Net Portable
* .Net Standard
* .Net Compact
* Universal Windows Platform
* Portable Class Libraries

All of these were explained to me as _&quot;a subset of the full .Net that allows you to target multiple platforms&quot;_.  So my questions are

1. **What&#39;s the difference!?**
2. If I want to write a library that&#39;s usable to as large an audience as possible, **which one _(or more than one)_ of these do I need to use?**

---

_(My specific situation: I have [a library](https://github.com/BlueRaja/High-Speed-Priority-Queue-for-C-Sharp) that targets .Net 2.0, .Net 4.5, and UWP.  Targeting UWP required creating a new VS project and linking all the existing files, which is a huge pain.  Now someone is telling me it doesn&#39;t work for PCL, and from the sound of it I have to do it AGAIN for .Net Standard!?)_

Difference between .Net Core, Portable, Standard, Compact, UWP, and PCL?

This is a problem that happens specifically on the ARM, not on x86 or x64.  I had this problem reported by a user and was able to reproduce it using UWP on Raspberry Pi 2 via Windows IoT.  I&#39;ve seen this kind of problem before with mismatched calling conventions, but I&#39;m specifying Cdecl in the P/Invoke declaration and I tried explicitly adding __cdecl on the native side with the same results.  Here is some info:

P/Invoke declaration ([reference][1]):

    [DllImport(Constants.DllName, CallingConvention = CallingConvention.Cdecl)]
    public static extern FLSliceResult FLEncoder_Finish(FLEncoder* encoder, FLError* outError);


The C# structs ([reference][2]):

    internal unsafe partial struct FLSliceResult
    {
        public void* buf;
        private UIntPtr _size;
    
        public ulong size
        {
            get {
                return _size.ToUInt64();
            }
            set {
                _size = (UIntPtr)value;
            }
        }
    }
    
    internal enum FLError
    {
        NoError = 0,
        MemoryError,
        OutOfRange,
        InvalidData,
        EncodeError,
        JSONError,
        UnknownValue,
        InternalError,
        NotFound,
        SharedKeysStateError,
    }
    
    internal unsafe struct FLEncoder
    {
    }

The function in the C header ([reference][3])

    FLSliceResult FLEncoder_Finish(FLEncoder, FLError*);

FLSliceResult may be causing some problems because it is returned by value and has some C++ stuff on it on the native side?

The structs on the native side have actual information, but for the C API, FLEncoder is defined [as an opaque pointer][4].  When calling the method above on x86 and x64 things work smoothly, but on the ARM, I observe the following.  The address of the first argument is the address of the SECOND argument, and the second argument is null (e.g., when I log the addresses on the C# side I get, for example, 0x054f59b8 and 0x0583f3bc, but then on the native side the arguments are 0x0583f3bc and 0x00000000).  What could cause this kind of out of order problem?  Does anyone have any ideas, because I am stumped...

Here is the code I run to reproduce:

    unsafe {
        var enc = Native.FLEncoder_New();
        Native.FLEncoder_BeginDict(enc, 1);
        Native.FLEncoder_WriteKey(enc, &quot;answer&quot;);
        Native.FLEncoder_WriteInt(enc, 42);
        Native.FLEncoder_EndDict(enc);
        FLError err;
        NativeRaw.FLEncoder_Finish(enc, &amp;err);
        Native.FLEncoder_Free(enc);
    }

Running a C++ app with the following works fine:

    auto enc = FLEncoder_New();
    FLEncoder_BeginDict(enc, 1);
    FLEncoder_WriteKey(enc, FLSTR(&quot;answer&quot;));
    FLEncoder_WriteInt(enc, 42);
    FLEncoder_EndDict(enc);
    FLError err;
    auto result = FLEncoder_Finish(enc, &amp;err);
    FLEncoder_Free(enc);

This logic can trigger the crash with the latest [developer build][6] but unfortunately I have not yet figured out how to reliably be able to provide native debug symbols via Nuget such that it can be stepped through (only building everything from source seems to do that...) so debugging is a bit awkward because both native and managed components need to be built.  I am open to suggestions on how to make this easier though if someone wants to try.  But if anyone has experienced this before or has any ideas about why this happens, please add an answer, thanks!  Of course, if anyone wants a reproduction case (either an easy to build one that doesn&#39;t provide source stepping or a hard to build one that does) then leave a comment but I don&#39;t want to go through the process of making one if no one is going to use it (I&#39;m not sure how popular running Windows stuff on actual ARM is)

**EDIT** Interesting update:  If I &quot;fake&quot; the signature in C# and remove the 2nd parameter, then the first one comes through OK.

**EDIT 2** Second interesting update:  If I change the C# FLSliceResult definition of size from `UIntPtr` to `ulong` then the arguments come in correctly...which doesn&#39;t make sense since `size_t` on ARM should be unsigned int.

**EDIT 3** Adding ` [StructLayout(LayoutKind.Sequential, Size = 12)]` to the definition in C# also makes this work, but WHY?  sizeof(FLSliceResult) in C / C++ for this architecture returns 8 as it should.  Setting the same size in C# causes a crash, but setting it to 12 makes it work.

**EDIT 4** I minimalized the test case so that I could write a C++ test case as well.  In C# UWP it fails, but in C++ UWP it succeeds.

**EDIT 5** [Here](https://gist.github.com/borrrden/58b6b7e49053395e18684ed7f4971f32) are the disassembled instructions for both C++ and C# for comparison (though C# I&#39;m not sure how much to take so I erred on the side of taking too much)

**EDIT 6** Further analysis shows that during the &quot;good&quot; run when I lie and say that the struct is 12 bytes on C#, the return value gets passed to register r0, with the other two args coming in via r1, r2.  However, in the bad run, this is shifted over so that the two args are coming in via r0, r1 and the return value is somewhere else (stack pointer?)

**EDIT 7** I consulted the [Procedure Call Standard for the ARM Architecture](http://infocenter.arm.com/help/topic/com.arm.doc.ihi0042f/IHI0042F_aapcs.pdf).  I found this quote:  &quot;A Composite Type larger than 4 bytes, or whose size cannot be determined statically by both caller and
callee, is stored in memory at an address passed as an extra argument when the function was called (&#167;5.5,
rule A.4). The memory to be used for the result may be modified at any point during the function call.&quot;  This implies that passing into r0 is the correct behavior as extra argument implies the first one (since C calling convention doesn&#39;t have a way to specify the number of arguments).  I wonder if the CLR is confusing this with another rule about **fundamental** 64-bit data types:  &quot;A double-word sized Fundamental Data Type (e.g., long long, double and 64-bit containerized vectors) is
returned in r0 and r1.&quot;

**EDIT 8** Ok there is a lot of evidence pointing to the CLR doing the wrong thing here, so I filed a [bug report](https://github.com/dotnet/coreclr/issues/12503).  I hope someone notices it between all the automated bots posting issues on that repo :-S.

  [1]: https://github.com/couchbase/couchbase-lite-core/blob/e8a4c5e3df5796b380d2019546b403ab0229702f/CSharp/src/LiteCore.Shared/Interop/Fleece_native.cs#L490-L491
  [2]: https://github.com/couchbase/couchbase-lite-core/blob/e8a4c5e3df5796b380d2019546b403ab0229702f/CSharp/src/LiteCore.Shared/Interop/Fleece_defs.cs
  [3]: https://github.com/couchbaselabs/fleece/blob/b607804bd45b0298f612d8fd1b5299b773a4a89b/Fleece/Fleece.h#L516
  [4]: https://github.com/couchbaselabs/fleece/blob/b607804bd45b0298f612d8fd1b5299b773a4a89b/Fleece/Fleece.h#L38
  [5]: https://github.com/couchbase/couchbase-lite-net/blob/feature/api-v2/src/Couchbase.Lite.Tests.UWP/UnitTestApp.xaml.cs#L68
  [6]: https://github.com/couchbase/couchbase-lite-net/releases/tag/2.0.0-db009

Content Type	Original Author	Original Content on Stackoverflow
Question	Mrk	View Question on Stackoverflow
Solution 1 - C#	kain64b	View Answer on Stackoverflow

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