Develop Reference

Setting up my WPF solution and the "Project doesn't know how to run the profile" error

I've created a solution in VS2022 using the WPF application template (not the one that says (.net framework)) and when trying to run it I get the error popping up:
"The project doesn't know how to run the profile with name 'wpftestproject' and comment 'Project'."
See the image below, it's not an output window error but an actual pop-up window.
I'm on Windows 10 pro and trying to get this template solution to run (it should pop up a MainWindow).
I have no idea what could be the source of this issue and I'm not finding anything online.
One thing I noticed is that under application properties the "Target framework" is default to .NET6.0 and not .NET CORE 3.0 for some reason. Though changing this isn't fixing it.
I've also tried having a look over my VS installation, it doesn't seem to me that anything is missing but maybe someone else knows something:

Normally you need to install correctly, .Net desktop development and universal windows platform development.(Try to reinstall .Net desktop development)
And install the packages you need in individual components.
If reinstalling these does not help you, I suggest you choose update->repair

Exception : A reference to a higher version or incompatible assembly cannot be added to the project

Whenever I try to add Windows.Web.Http.dll to my windows phone 8.1 application , in my visual studio 2013 environment, I am getting the following exception.
A reference to a higher version or incompatible assembly cannot be added to the project
I don't see any "Unblock" options as many bloggers suggest.
If someone have come across such an error, please share your thoughts..
Thanks in advance
~Sebastian

Don't use the Browse panel but instead search in the Assemblies panel, the Windows.Web.Http.dll you have seems to not support Windows Phone 8.1 project.

Windows.Web.Http is not supported in Windows Phone 8 Check the requirement section on below documentation link for Windows.Web.Http
Windows.Web.Http namespace
For windows phone 8 try using System.Net.WebClient.
P:S. I will recommend use Windows phone 8.1
Hope this helps

Converting a WIndows Store MonoGame app to Android

I'm very new to Xamarin. I have a few published Windows Store apps and want to convert them to Android. I'm attempting to use Xamarin for this. I'm just using the free version of Xamarin. Here's where I am so far:
I am trying two apps - one was build with Monogame and one is just build on the WinRT framework.
I have managed to get them both into Xamarin studio, basically by hacking the csproj files.
I'm getting build errors because it's missing references. There does appear to be some equivalent Mono / .Net4 libraries, but things like Storage seem to be missing.
So, my question is: am I going about this the right way and, if so, am I missing a step ("convert dependencies" or something)?
If I'm not going about this the right way then how should I be doing this (I found very few online resources on this subject)?
EDIT:
The following are some specific errors that I'm getting from the Xamarin App:
And my references:
EDIT:
After some further research, the only dependency I can't explain as missing is Microsoft.Xna.*. The others all have different implementations on Android / iOS.

You will be able to use much of your existing code with Xamarin.
However, the errors you are getting with those specific libraries are because they do not exist for Xamarin in iOS and Android. So whatever functionality you had you will need to rework using libraries that are available.
For example, instead of using Windows.Storage you would use Android.OS.Storage.
See their documentation for details:
http://androidapi.xamarin.com/index.aspx?link=N%3AAndroid.OS.Storage
Edit
For XNA all of that should port fine if you use MonoGame:
https://github.com/mono/MonoGame/wiki
I'm not sure why it's not bundled in Xamarin, but that will hook you up.
Edit
This is taken from Xamarin documentation found here: http://developer.xamarin.com/guides/cross-platform/cocos2d_xna/cocos2dxna_tutorial/
After creating the project, you need to add the various Cocos2D-XNA dependencies to the solution. Add the following projects from the location where you downloaded the Cocos2D-XNA and MonoGame source:
box2d.iOS – 2D physics library. We’ll use this in later tutorials.
cocos2d.iOS – Cocos2D-XNA for iOS.
Lidgren.Network.iOS – Networking library used by MonoGame.
MonoGame.Framework.iOS – MonoGame for iOS.

This video may answer your question. You will most likely need to replace the reference with a PCL equivalent if one exists.
http://developer.xamarin.com/videos/cross-platform/any/

Convert folder of images to video using WP7+

I am trying to use Slicer dll reference to convert images to a video file, but I am having a problem with adding the reference to my Windows Phone project, I get the error
Reference cannot be added to l because it was not built using the Windows Phone runtime. Windows Phone projects will work only with Windows Phone assemblies.
I searched and found this link where it's mentioned to
Create a new class library for Silverlight for Windows Phone 7
I don't know if I am creating the class project right but it's not working I get the same errors as with the win phone project, can't install .dll, does anyone know how I can create the class library correctly without this error?
Or even if it is possible to use Splicer with windows phone 7 & 8?
Thanks for your help.

As far as I know, Splicer isn't built to work on Windows Phone. While it seems like it would make sense that general .NET libraries would work on a .NET compatible platform like WP7 and WP8, that's not necessarily the case. (a little outdated, but here: http://dotnet.dzone.com/articles/not-every-library-will-work)
You could always check out Splicer from Codeplex, but you'd probably have to do a non-trivial amount of modification to get it to work for your project. I'd surmise you could maybe pull it off by just modifying the class libraries in the solution, but there are probably pitfalls included with that. Worse comes to worse, you could take all the source files, copy them into a new Windows Phone library project, and then resolve all the build errors. Either way, it'll involve some work.

Windows Phone 7 and System.Xml.Linq library

I'm trying to follow this tutorial about WP7 development: http://mobile.tutsplus.com/tutorials/windows/introduction-to-windows-mobile-7-development/
It's talking about using XElements, which require the System.Xml.Linq library, but I can't find a way to add it to the project references. When I go to add reference, the .NET list is empty, and it's saying it's filtered to Windows Phone 7.
The tutorial might be out of date. Is the library even available for WP7? Is there a different way to read XML on the platform?
How can I get it working?
EDIT:
The same problem is described here:
http://forums.netduino.com/index.php?/topic/1127-add-reference-net-tab-empty/
The suggested fix doesn't work for me.
EDIT:
Apparently this is a bug in the Silverlight 4 Tools:
https://connect.microsoft.com/VisualStudio/feedback/details/529718/empty-net-tab-when-adding-a-reference

That is the correct Assembly you need to work with XML in Windows Phone 7. Not sure why it does not show up in your Add Reference dialog.
It should be like following:
What version of WP7 developer tools are you using?

The assembly list should not be empty when adding a reference from the .NET tab even for a Windows Phone 7 project, so it sounds like you might have an issue with Visual Studio.
However, you could try using the Browse tab instead. On my system (64-bit), the assembly is in the C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\Silverlight\v4.0\Profile\WindowsPhone folder.

Yes, LINQ to XML is definitely available for Windows Phone 7. If you aren't seeing any available references to add, that sounds like your development environment is a little bit messed up...