Develop Reference

Having trouble while Installing a Nuget package(WIndows.winMD)

Getting error while trying to install a Nuget Package
I'm trying to install a pakage and get the following error:
NuGet\Install-Package Microsoft.Windows.WinMD -Version 1.0.210629.2'
NuGet\Install-Package : Could not install package 'Microsoft.Windows.WinMD 1.0.210629.2'. You
are trying to install this package into a project that targets '.NETFramework,Version=v4.7.2',
but the package does not contain any assembly references or content files that are compatible
with that framework.
Please help

Do I understand correctly that you want to write a .net wrapper over a C++?
If so, this is nuget package does not contain dll files. Most likely you need to build the C++ library first and add build result as content in your project.

This nuget package framework is tagged with native.
nuget: Microsoft.Windows.WinMD - Frameworks
The native framework tag is for C++ projects.
DevBlogs: Support for Native Projects
Conclusion: This package can not be consumed or used by any C# project.
However, in the nuget used-by tab of that package is a reference to a C++ github project that uses this package and is described as
C# language projection for the Windows Runtime
You may have a look at that.

Could not install NuGet package MPI.NET 1.3.0 in MS Visual Studio 2017

I am trying to install NuGet package MPI.NET 1.3.0 to MS Visual Studio 2017 C# project. I am getting the following error:
Could not install package 'MPI.NET 1.3.0'. You are trying to install this package into a project that targets '.NETFramework,Version=v4.0', but the package does not contain any assembly references or content files that are compatible with that framework. For more information, contact the package author.
I have tried to create C# projects in different versions of .NET Framework, but it would not install. On the official GitHub site for this package (MPI.NET GitHub repository) it is written that the package is updated for .NET 4.0. I have tried creating 4.0 and lower projects, but no success.
Help anyone?

Looking at the packages available on nuget.org, version 1.3.0 targets .NET 4.6.2, whereas version 1.2.0 targets .NET 4.0. So if you try to install version 1.2.0 of the package into your project, you should be okay. It sounds like the GitHub documentation needs to be updated to reflect this new reality.
(Personally I would bump the major version number for a change like this, given that it's not necessarily backwardly compatible for existing users, but semantic versioning is less cut and dried than it sometimes sounds.)

Can't install NuGet-Packages (Xamarin Android project)

I have a problem with NuGet installing the "Xamarin.JOSE.JWT" package. I get the following error:
> Could not install package 'Xamarin.JOSE.JWT 1.0.3'. You are trying to
> install this package into a project that targets
> 'MonoAndroid,Version=v6.0', but the package does not contain any
> assembly references or content files that are compatible with that
> framework. For more information, contact the package author.
Is this a known problem or is there a workaround for this?

Xamarin.JOSE.JWT 1.0.3 does not support Xamarin.Android projects. It only contains assemblies for .NET Framework 4.0.
Your options are:
Find another NuGet package that does support Xamarin.Android projects.
See if you can compile the Xamarin.JOSE.JWT project against Xamarin.Android.
Open an issue on the Xamarin.JOSE.JWT GitHub repository.
Try directly referencing the jose-jwt.dll from the NuGet package and see if it works with an Android project. This may not work if it is using parts of the .NET Framework not supported by Xamarin.Android.
Use the Xamarin.JOSE.JWT NuGet package on the server side and not in the Android project.

How to make a NuGet package for this PCL library

I'm trying to create a nuget package for a PCL library I've made.
This nuget package is intended to be used in a Xamarin Forms application though. So I'm not even sure if the things I've ticked are correct.
I really only care about .NET Framework 4. That is my bare minimum framework. For the rest, I don't care at all and have no idea what I should be targetting.
For what it's worth, I'm using NuGet Package Explorer to create my NuGet nupkg files to manually test them before I publish them to NuGet.
Here's a screenshot of what I was trying, but Xamarin Studio failed to add the nuget package (saying it wasn't the right something-or-rather).
and the error message from Xam Studio:
Adding Foo...
Adding 'Foo 1.3.0' to Core.
Could not install package 'Foo 1.3.0'. You are trying to install this package into a project that targets 'portable-net45+win+wp80+MonoTouch10+MonoAndroid10+xamarinmac20+xamarinios10', but the package does not contain any assembly references or content files that are compatible with that framework. For more information, contact the package author.

For Xamarin.Forms the two profiles that are good ones for your Portable Class Library (PCL) project to use are Profile 78 or Profile 259. Xamarin.Forms can be used in other profiles but if your PCL project targets one of these you should be OK. Your project looks to be targeting Profile 78.
Here are the Xamarin.Forms PCL profiles for reference.
Xamarin.Forms 1.3:
portable-win+net45+wp80+MonoAndroid10+MonoTouch10
Xamarin.Forms 1.4:
portable-win+net45+wp80+win81+wpa81+MonoAndroid10+MonoTouch10+Xamarin.iOS10
The problem with your NuGet package that it does not indicate that it supports Windows 8 in the PCL. NuGet will look at all the individual frameworks that make up the project's PCL profile (ignoring the Xamarin and Mono ones since they are optional if you do not have them in your NuGet package's PCL profile) and ensure that the NuGet package's PCL profile has a framework which is compatible. If the NuGet PCL does not have a matching framework then NuGet considers it incompatible.
So your NuGet package's portable library folder would need to include win
portable-net4+sl5+wp8+win
Then you can install your NuGet package into your Profile 78 PCL project.

Restrict Dependencies to specific .NET version using NuGet

I have a C# solution targeted for framework 4.5.1 but the server I need to install this on uses 4.0 so I need to roll this back.
The developer has used NuGet (which I'm not really familiar with) for dependency management. I've seen there is a way to request specific versions of each library so I'm hoping there is a feature which allows me to restrict these to a specific .NET version.
How can I get NuGet to install the latest dependencies for .NET version 4, or is this not a feature it supports?

If you change the target framework of the project then Visual Studio will check the compatibility of the NuGet packages and tell you which ones are compatible or not and whether they need to be reinstalled. You can then reinstall them from the Package Manager console using the -reinstall option.
Update-Package –reinstall <packageName>
NuGet does not directly support a way to restrict or install NuGet packages for a specific .NET version. The NuGet package will either support that .NET version or not. You can restrict a project to a specific version of the NuGet package by using the allowedVersions attribute in the packages.config file but that is independent of the .NET version the NuGet package supports.

Nuget should install packages that are available for the targeted version of .NET
Check your packages folder, or check the documentation of each dependency for support of .NET 4.0
In some cases you may just be able to re-target your application without uninstalling any Nuget packages.
To install a specific version of a Nuget package, you can use the "-Version" flag
Example -
Install-Package AvalonDock -Version 2.0.1320
References -
http://docs.nuget.org/Consume/Package-Manager-Console
http://dutton.me.uk/2013/07/24/how-to-install-a-specific-version-of-a-package-with-nuget/