I'd would like to use RabbitMQ .I find nugget .NET but i get error :
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.
How Can I implement connection with RabbitMQ . Manual copy source ?
The issue is that the RabbitMQ nuget package needs the full .NET Framework. Since PCLs and Xamarin Android projects don't provide the full framework, it won't work. One option is to take the source code and build it in a PCL like you suggested (eg see https://forums.xamarin.com/discussion/49858/using-rabbitmq-amqp-with-xamarin-forms). Depending on what you want to do, I think using the HTTP API might be worth considering too.
Rabbit MQ is now also built as a .net standard 1.5 libraries. https://www.nuget.org/packages/RabbitMQ.Client
You should be able to pull it into the latest Xamarin without any problems (taking into account that your xamarin build is set up to support version .net standard 1.5 or version 2.0).
Xamarin forms added support for standard libraries from version 2.3.5-pre
https://devblogs.microsoft.com/xamarin/building-xamarin-forms-apps-net-standard/
UWP is easily supported with .net standard 2.0 and is compatible with the 1.5 libraries.
Related
When I read about standard libraries i understand it as it can be used with core and standard (correct me if I am wrong). I have created a Standard library as a data library.
I now want to implement DocumentDB so I added the nuget package:
So my dependencies looks like this:
However I am not able to use the nuget package:
I dont get any errors, so I am guessing it must be the framework target? Any pointers here?
If you take a look at the dependencies on the Microsoft.Azure.DocumentDB package, it is dependent on .NET Framework v4.6.1. While .NET Standard 2.0 allows the loading of packages from .NET Framework it's discouraged as you can run into unexpected errors.
Instead you can use the Microsoft.Azure.DocumentDB.Core package or the new v3 package Microsoft.Azure.Cosmos as they both target .NET Standard directly so there will be no compatibility issues.
I have a Xamarin Forms project and the majority of times that I want to install a nuget package I have an error saying that:
Install-Package : Could not install package 'Microcharts 0.7.1-pre'. You are trying to install this package into a project that targets
'.NETPortable,Version=v4.5,Profile=Profile259', but the package does not contain any assembly references or content files that are compatible with that framework.
I Assume I can work this out by changing the project .net framework target. But when I go and change it, I get an error saying that it cannot change the target because that implies upgrading nuget to 3.0 and It can´t do that.
So my question is: Which is the best way(and simplest) to change the target framework so I have less problems like above with nuget packages.
This library was built to target .NETStandard v1.4. You are trying to use it in a PCL project, that is not possible. PCL is on the way out as the previous not-so-good way to build cross-platform libraries, .NETStandard is the new way.
There is no older version available of this library, rebuilding it from source is a possible option. But realistically it is time to move on to avoid hitting this wall over and over again, you need to update your tooling so you can consume these kind of libraries. The VS2017 Community edition is freeware.
It is time to go from your
.NET PCL Library to an appropriate .NET Standard Library.
Here are some links concerning the migration to .NET Standard.
Upgrade PCL to .NET Standard Class Library
.NET Standard 2.0 Support in Xamarin.Forms
Converting PCL (Portable Class Libraries) to .NET Standard Class Libraries
.NET Standard - PCL Compatibility
.NET Standard Implementation Support
My Suggestion concerning the version of the .NET Standard to use.
If you don't care about backwards compatibility (You want to use the latest OS and SDKs) go all the way to .NET Standard 2.
If you want to have a good backward compatibility you should go on .NET Standard 1.1 - 1.5.
On most projects i use 1.4 - 1.5.
I was working with Unity and Hololens and tried to establish connection to Azure Iot Hub via MQTT protocol. Microsoft provides a tutorial for getting started with Azure IoT Hub in C#, but unfortunately, I encountered a problem with the tutorial:
In the picture above, I have selected Microsoft.Azure.Device NuGet package for installation. I have tried version 1.0.0 and also the latest one available, 1.2.4. The projects were automatically generated by Unity and that is probably the reason, why I do encounter this problem. Which problem? After I try to install the selected NuGet, I encounter the following error:
Could not install package 'Microsoft.Azure.Devices 1.2.4'. You are
trying to install this package into a project that targets
'.NETFramework,Version=v3.5,Profile=Unity Full v3.5', 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 was like, "Hmm, I must have wrong .NET framework version. I wonder if I can change that..." I tried to go to project properties like this
Microsoft advises changing .NET framework from Properties context menu item:
https://technet.microsoft.com/fi-fi/library/bb772098(v=vs.90).aspx (4.24.2017)
https://msdn.microsoft.com/en-us/library/bb398202(v=vs.100).aspx (4.24.2017)
However, this feature must be blocked by something, because the view that is supposed to open flashes white and disappears immediately. I suppose Unity doesn't like people tinkering with project properties, but what else can I do? Incompatible .NET framework issue needs to be resolved, so that the NuGet package can be installed, but how do I do that?
In short, how to install Microsoft.Azure.Devices NuGet package for Unity?
Sorry, this isn't possible due Unity's restriction to .net 3.5.
To be exactly, they use a custom version of mono-2.
You could try the new (experimental) .net 4.6 settings in Unity 5.6.
https://forum.unity3d.com/threads/upgraded-mono-net-in-editor-on-5-5-0b4.433541/
I'm trying to make Npgsql, the PostgreSQL provider for .NET, available for consumption by Xamarin users. I've explored various methods for doing this and seem to be blocked.
First, a Xamarin project can consume packages which target certain PCL profiles. The problem is that none of of these PCL profiles contain System.Data, which Npgsql requires, even though Xamarin itself allows you to use System.Data.
Second, Npgsql already supports the .NET Platform Standard (version 3), and the documentation on the standard contains the following sentence:
If a library targets .NET Platform Standard version 1.3, it can only run on .NET Framework 4.6 or later, .NET Core, Universal Windows Platform 10 (UWP), and Mono/Xamarin platforms.
However, trying to go down this path yielded several errors (this question is one of them). My guess is that the Xamarin tooling isn't yet fullynetstandard-aware.
Finally, it seems possible to import Npgsql as a shared project inside the user's solution, but this seems like a very hacky and wrong solution - it bypasses NuGet entirely.
Does anyone have any info on this?
That npgsql package seems to be depending on pre-release packages (RC - Release Candidate). Run the install with -pre option:
Install-Package npgsql -pre
This worked at least when installing to an iOS project. Not sure if it functions correctly as none of the dependencies are added to the References, only Npgsql.
I believe your speculation is correct of Xamarin tooling not being fully netstandard/PCL5 aware AFAIK(Your speculation is as good as mine). This is a huge effort by all parties involved to be unified. There have also been significant changes on the dotnet end that can alter this.
For your questions about System.Data:
System.Data is missing a bit of functionality: https://developer.xamarin.com/guides/ios/advanced_topics/system.data/#Missing_Functionality
System.Data is available via the Xamarin.iOS.dll assembly as it's not supported in PCLs.
https://developer.xamarin.com/guides/ios/under_the_hood/assemblies/
https://msdn.microsoft.com/en-us/library/system.data(v=vs.110).aspx (Notice no PCL items inside)
Finally, there should be a blog post next week about netstandard via https://blogs.msdn.microsoft.com/dotnet/2016/05/23/changes-to-project-json/
I would highly recommend that you join the .NET core slack channel to ask any questions you may have.
http://tattoocoder.com/aspnet-slack-sign-up/
I have created a Portable class library in Xamarin and want to use it for an android app. I want to use the HttpClient within this PCL. I have added the Microsoft Http Client libraries from the NuGet Package manager. I can now see the .Net portable subset added to my references. But somehow I still cannot use the HttpClient and it does not show in the .Net portable subset as well.
Also, my Current profile of the PCL is 4.0-Profile 158. If I change the profile to 4.5, Xamarin crashes and does not open the solution
Can anyone help me with this?
Thanks
The simple solution is to target .NET 4.5, Windows Store apps (Windows 8.1), Xamarin.iOS, and Xamarin.Android (4.5-Profile7). Then you won't need the HttpClient NuGet package to get those APIs.
If Xamarin is crashing when you try to select a 4.5 profile, please make sure you're using the latest version and then report the bug with details about how to repro it and what happens.
Also the HttpClient NuGet package should allow you to use HttpClient from PCL profile 158. Make sure you're using the latest version of NuGet. ".NET Portable Subset" should always appear in your references for a PCL, that's not related to the NuGet package. When you install the HttpClient NuGet package, you should also see references to System.Net.Http and other assemblies in your references.