# From PCL to .NETStandard Tweetinvi has been a Portable Class Library (PCL) since 2014 in order to help C# developers to use Twitter in Mono and then in Xamarin. With .NetStandard PCL will progressively being migrated to .NETStandard libraries and this is why Tweetinvi is no longer a PCL. # New targets: .NETStandard 1.3 and .NETFramework 4.6 During this migration I had to make choices regarding the target. Initially I wanted to keep targeting .NETStandard 1.0 and .NETFramwork 4.0. Unfortunately I was not able to do so and the minimum target of Tweetinvi 2.0 and later will be .NETStandard 1.3 and .NETFramework 4.6. ## New dependency - [Nito.AsyncEx.Context](https://www.nuget.org/packages/Nito.AsyncEx.Context) is a new dependency of Tweetinvi. This library is used to ensure that async functions provided by Tweetinvi correctly "continue" on the same invoker thread. ## Removed dependencies - [Microsoft.Bcl.Async](https://www.nuget.org/packages/Microsoft.Bcl.Async/) is no longer a nuget dependency as `async` has been integrated in .NETFramework 4.5. # Sample projects The new solution includes various new sample projects that you can reuse to start your project. At the time of this release you can find the following : - Console Application for .NET Framework ([Examplinvi.NETFramework](https://github.com/linvi/tweetinvi/tree/master/Examplinvi.NETFramework)) - Console Application for .NET Core ([Examplinvi.NETStandard](https://github.com/linvi/tweetinvi/tree/master/Examplinvi.NETStandard)) - MVC web project using .NET Framework ([Examplinvi.ASP.NET](https://github.com/linvi/tweetinvi/tree/master/Examplinvi.ASP.NET)) - MVC web project using .NET Core ([Examplinvi.ASP.NET.Core](https://github.com/linvi/tweetinvi/tree/master/Examplinvi.ASP.NET.Core)) - Xamarin Android App ([Examplinvi.Xamarin.Android](https://github.com/linvi/tweetinvi/tree/master/Examplinvi.Xamarin.Android)) - Xamarin iOS App ([Examplinvi.Xamarin.iOS](https://github.com/linvi/tweetinvi/tree/master/Examplinvi.Xamarin.iOS)) - Windows Universal App ([Examplinvi.UAP](https://github.com/linvi/tweetinvi/tree/master/Examplinvi.UAP)) Other samples will come in the future. I am currently thinking of **WPF** and **RaspberryPi**. # Bug Fixed A critical bug regarding `async` and multithreading where the `Task` completion callback Thread was not the calling thread. This issue was happening in application without any `SynchronizationContext` like `console` application. You can read more about it on the bug at : https://github.com/linvi/tweetinvi/issues/473. # ASP.NET (.NET Framework) considerations By default Tweetinvi should install properly to ALL type of projects with the proper .NET targets. In some cases the installation of the `System.Net.Http` and `System.Runtime.Serialization.Primitives` dependencies can result in dependency conflicts over the version of the DLL to use. If you encounter an Exception stating that the library `System.Net.Http` or `System.Runtime.Serialization.Primitives` could not be found, please add the following configuration in your `web.config`. ``` xml ``` These lines should be added under the ` `.

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