System.NullReferenceException occurs in xaml designer - xaml

I've created a C++ UWP Windows 10 app using Visual Studio 2015. However, I'm not able to visualize any xaml in the designer because I'm always getting a System.NullReferenceException error. How can I fix this?

That's very odd but I solved following these steps:
Close any instance of Visual Studio
Open Visual studio and create a new C# UWP empty project (name it as you like, do not matter)
Run the "useless" created project then close it as Visual Studio
Open again your previous C++ UWP project
In my case everything started working!

Switching solution platform to x86 worked for me.

I'm experiencing exactly the same problem on my primary development machine but not on another. The reason is... I think... When I installed Visual Studio 2015 on the 2nd machine, the first time I created a Universal Solution (C#) I was shown a dialog asking me to OK "elevated permissions" (custom permissions) for the VS2015 installation folder. I OK'd it and Designer works on that machine in both Blend2015 and VS2015 (community edition)
On the other machine I was never shown the dialog asking me to confirm elevated permissions and Designer does NOT work on that machine (VS2015 Enterprise). This machine also has VS2013 update 5) on it.
I am thinking that I might have to completely wipe off VS2015 and try to clean the registry of all VS2105 references AND remove the VS2015 installation directories on C:\ AND when I reinstall, create a installation directory with a different name (if I can). What a PAIN though... I'm waiting to see if MS delivers a simple solution since I'm quite positive that this whole issue boils down to a bug (feature... grrr) having to do with custom permissions that can't be changed (or added) after installation.
Would be nice is MS would confirm this...
(please note, none of this involved c++... it was all C#)
Tom
this is the dialog I was shown on the machine where Designer works]1

Installing the Windows Software Development Kit (SDK) for Windows 10 solved the issue for me. It may ask to unistall the previous version of Windows 10 RTM SDK
https://developer.microsoft.com/en-us/windows/downloads/windows-10-sdk

This is fixed in Update 1 of Visual Studio 2015
https://www.microsoft.com/en-us/download/details.aspx?id=49989

Related

VS2015: The components for communicating with FTP servers are not installed

I have been using Visual Studio 2010 Pro for my vb.net desktop application development. I publish the apps via clickonce to a web server with ftp. My settings look like this:
Publishing folder location: ftp://www.webaddress.com/folder/
Installation folder : http://webaddress.com/folder/
This works perfect in VS2010.
I am now trying to upgrade to Visual Studio 2015 community edition. When I try to publish my app, I get the error "The components for communicating with FTP servers are not installed". I am getting this error on both computers I have installed VS2015 on.
Strangely enough, there isn't much info on this error. The only solution I've seen is to repair the installation. I did this but still a no go.. Another cause I read about is having Xamarin installed, but I have never had that installed.
Has anybody run into this and know what the fix is??
EDIT:
It appears to not actually have anything to do with installed components. After I posted this question, I realized the publish via FTP had worked earlier on a little sample Hello World project i made (brain fart). It was only once I loaded my existing project that this error started showing up.
I closed the solution, created another simple project, and still got the error. I closed visual studio, reopened the sample project, and ftp worked! I then opened my existing project and ftp worked there too?! So I don't know what the trigger is, and I haven't had it fail again yet, but maybe this info will help figure out what is causing the failure.
EDIT (3/30/2017)
Just an update - I am still having this issue. This issue happens on visual studio 2013, 2015, and 2017. I have tried reinstalling the c++ redistributable, still nothing. It seems others are having this issue with a web project but mine is a desktop app publishing with clickonce via FTP. It must be something to do with solution I am working on that was originally created in 2010, as the issue is not present in any other project.
I had the same issue with Visual Studio 2017. What fixed it for me was to start the Visual Studio Installer and install the ".NET Core cross-platform development" workload.
I had the same issue in Visual Studio 2015 / Update 3. It was resolved after installing the 32-bit version of Visual C++ Redistributable Packages for Visual Studio 2013 (https://www.microsoft.com/en-us/download/details.aspx?id=40784)
See also https://github.com/aspnet/Tooling/issues/748
I had the same problem with Visual Studio 2015. And Publish used to work fine so I went going crazy looking for and trying different solutions. Then I read on another thread of doing a Setup-> Repair (submitted by Erikest). I did a Setup->Repair and the publish process now works! I think it's also possible that the Repair not only did the trick on the FTP components but also replaced the C++ redistributable (often mentioned as a solution to this problem),
This is a total work around, but I've noticed I get this error every time I open my app (that originated in VS2010) and try to publish without first opening a sample app. I created a new project and published it to my FTP server. When I receive this error, I close Visual studio, reopen and the open the sample project, publish that app, then open my real app. The publish then works.
This works every time, and seems to be a bug in Visual studio, and probably has something to do with the fact that my app was originally built in 2010.
Maybe this will help somebody else with the same issue. It's a big pain so hopefully MS gets a fix in for this.
I have been banging my head against this problem for many months, re-installed VS over and over and just did a clean install of Windows 10 in the hope it would work but to no avail. By chance I cleaned some old .accdb files from the App_Data folder that I no longer need since I converted to SQL Server database and FTP publishing now works.
So it seems VS does not like the .accdb files but was happy with .mdb files when publishing with FTP.
As soon as I put the file back in App_Data the problem returns. Hope this is some help.
I had the same issue here, I was using the Publish right click option on the project, which had been working fine. What fixed it for me was going back through the publish options and re-testing the connection. Publish seemed to work after that. Maybe it forgot a password or settings?
I also installed the x86 C++ Redistribution Package.
Hope this helps someone who is in the same boat.
After many successful website publishes with Visual Studio 2015 Community Edition, we experienced the "components for communicating with ftp servers are not installed" issue. :(
First attempt at resolution was uninstalling VS Community 2015, then installing VS Community 2017. Received the same error: "components for communicating with ftp servers are not installed" when attempting to publish our business website.
With some work, we found that by uninstalling Microsoft Web Deploy and re-installing, this seemed to fix the problem. We can now use Visual Studio > Publish function to our ftp without problems.
See this link for download of Microsoft Web Deploy components.
https://www.microsoft.com/en-us/download/details.aspx?id=43717
Dont know what broke this VS IDE functionality, but hope this fix helps some.
I encountered the same error with Visual Studio 2019
I fixed it by using the Visual Studio Installer to install the Web Deploy (inc .netcore 2.1) under individual components
I just did a simple "repair installation" in the installer. Worked for me.
I am using Microsoft Visual Studio Community 2019 and had this problem for a while.
The problem went away after I updated about 10 NuGet updates that were over due.
I had the same problem, I closed all the open windows I closed Visual Studio and then I opened again and published and then it worked!

Why did my VB.NET app solution break when I moved from VS2013 on Win8.1 to VS2015 on Win10?

My solution worked fine under Win8.1 using VS2013. Then I did a clean install of Win10. I ran the msi that was created back on XP some time ago, and it installed my VB app after asking for a .NET3 version. But then I started up VS2015 for the first time and loaded my VB app's solution. I get errors like this: BC30002 Type 'Excel.Workbook' is not defined.
I looked in Control Panel's Programs and Features and only see .NET 4.5 and 4.6 items (nothing for .NET 3).
My solution includes references to Microsoft.Office.Core and Microsoft.Office.Interop.Excel.
What do I need to do to fix this?
I solved this by going back to Control Panel/Programs and Features, selecting Microsoft Visual Studio Community 2015, clicking Uninstall or change a program. Then when the VS2015 installer opened, I selected Modify, then All (every installation option) and installed VS again. That solved the above problem.
But now I have a new error: BC30002 Type 'ExcelLateBind is not defined. How do I fix this?

Visual Studio online build failure for an empty universal app

I just created a new empty universal app (windows 10) and checked it in on my visual studio online project.
The configured build is constantly failing on following error...
The imported project "C:\Program Files
(x86)\MSBuild\Microsoft\WindowsXaml\v14.0\8.2\Microsoft.Windows.UI.Xaml.CSharp.targets"
was not found. Confirm that the path in the declaration is
correct, and that the file exists on disk.
I set build configurations to use VS2015 but without any luck.
I keep thinking there's a simple configuration I'm missing here... but can it also be that it's not yet supported?
The project itself is just the standard template from Visual Studio.
I'm having a similar issue running with MSBuild 8.2 target missing under VS2013 Update 5 under Windows 10 TH1. Except my target is Microsoft.Windows.UI.Xaml.Cpp.targets. So not necessarily an issue with Visual Studio but rather the substitution for $(TargetPlatformVersion) in the targets definition:
<Import Project="$(TargetPlatformVersion)\Microsoft.Windows.UI.Xaml.Cpp.targets" />
I'm building a project from Microsoft (https://github.com/Microsoft/winsdkfb), so I don't think this is your problem (meaning you've not done anything incorrect).
I know this isn't an answer, but I suspect we're caught in a gap in the Windows 10 SDK & Tools. Those aren't scheduled to be complete and available until 29 July even though VS2015 has RTM'd. I tried to track down something in the VS2015 release notes without luck.
Just inform the solution I found on this thread.
At the time of writing, it appeared that VSTO serves were not yet updated with
the Windows 10 SDK.
The only way back then to make it run was by creating your own Build VM (through Windows Azure) and link it to your VSTO builds.
I posted the thread and got the answer on the MSDN TFS forum.
I have not tried it right now, but since Windows 10 is officially released now, I guess it may work out of the box.
We now support building Universal Windows Platform (UWP) projects on the hosted build service.

Can't open project in Visual Studio 2013 Express - Framework issue

So I have a program I've been making in VB for my company through Visual Studio 2013 Express for Desktop and have not worked on it in a couple of months. When I try to open it, I get the following error:
"The VB project "WindowsApplication1" is targeting ".NETFramework,Version=4.5" which is not installed on this machine."
http://imageshack.com/a/img661/6001/DGAfuk.png
I have all of the .NET frameworks installed including all developer and service packs (even language packs). I uninstalled all .NET frameworks and re-installed each of them without any resolution.
I tried to re-install Visual Studio and even tried changing the Framework (one of the options I have) but I cannot view any code or open designer view if I do so. (http://imageshack.com/a/img633/2109/OJaXbr.png)
The strange thing is this computer is the same one I have been developing this application on for months, so I'm not sure what happened over the last 60 days since I launched it.
Does anyone have any clues as to how I can resolve this issue?
Thanks in advance,
Matt
The path to your project must be Les then 256 Character.
That can be the reason of it.
Make sure the path is short "Copy the project to your c drive "C:\ProjectFolder" and try again".

Visual Studio 2013 crashing when opening XAML

I have a C# WPF project I can open just fine in VS 2010 Ultimate or 2013 Ultimate.
I can edit it and run it from either.
When I double click the window.xaml, it crashes 2013.
I disabled then uninstalled my extensions. Still crashes.
I spent more than half the day uninstalling (uninstall is broken, btw) and re-installing VS 2013 Ultimate. Still crashes.
Per comment, here's a screenshot of the error:
Actually just tried to create a clean WPF project and it crashes the same way while attempting to create a new WPF project.
Always check this folder for any VS errors
%APPDATA%\Microsoft\VisualStudio\PUTYOURVSVERSIONHERE\ActivityLog.xml
If the folder doesn't exist or is empty, run Visual Studio with this command:
devenv.exe /log
There could be many reasons. This one for example was because of an outdated driver. There may be workarounds, however which one to use will depend on the error you see. Can you update your question with the error message?