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New .NET Core 2.1 and ASP.NET Core 2.1 APIs

.NET Core 2.1 and ASP.NET Core 2.1 Preview1 have just been released (see here the official announcement) and we are going to explore new APIs in this post. We’ll found out many of the new features announced in the .NET Core 2.1 Roadmap and ASP.NET Core 2.1 Roadmap on the MSDN blog.

We just released NDepend v2018.1 and we took a chance to support analysis of .NET Core 2.1 and ASP.NET Core 2.1 applications. NDepend is often deemed as the Swiss-Army Knife for .NET developers thanks to its code query language (CQLinq). CQLinq can be used to write code rules, quality gatestrend code metrics, explore dependencies or advanced code search. One thing CQLinq excels at is exploring the diff between two snapshots of a code base. Exploring new APIs is a sub-task of exploring what was changed. Let’s harness this capability to explore new .NET Core 2.1 APIs.

New .NET Core 2.1 Preview1 APIs

We could have downloaded sources files of both .NET Core 2.1.0 Preview1 and 2.0.0, recompile and then do the diff. Instead, since NDepend can analyze raw assemblies even without sources available, we compared assemblies in these two folders:

  • C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.1.0-preview1-26216-03
  • C:\Program Files\dotnet\shared\Microsoft.NETCore.App\2.0.5

Here is the CQLinq code query that lists all new public classes and types. It is also refined to match public members (methods and fields) of each new type in the result.

Find the whole list here .NET Core 2.1 new public classes. Here is a first glimpse in the screenshot below. We highlighted the new great Span<T> capability.

.NET Core 2.1 new classes

Not only new public classes list is interesting, but also new public methods added on existing public classes. This query does list these 1.500 methods:

Here also find a screenshot below and the whole list here: .NET Core 2.1 new public methods on existing public classes. For this screenshot we used the new Dark theme support of NDepend v2018.1.

.NET Core 2.1 new public methods

Interestingly enough let’s list new namespaces that contain at least one public type:

.NET Core 2.1 new public namespaces


New ASP.NET Core 2.1 Preview1 APIs

To analyze ASP.NET Core assemblies it was a bit more difficult than just comparing assemblies in 2 folders. ASP.NET Core assemblies are stored in NuGet packages so we did explore assemblies in the folder C:\Program Files\dotnet\sdk\NuGetFallbackFolder and then tinker a bit to get the wanted versions in both 2.1 and 2.0 cases.

Let’s use the same code query to match ASP.NET Core 2.1 new public classes :

ASP.NET Core 2.1 new public class

The same way here is the ASP.NET Core 2.1 new public methods on existing public classes :

ASP.NET Core 2.1 new public methods in existing public classes

And finally, here are the new ASP.NET Core 2.1 namespaces that contain at least one public classes.

ASP.NET Core 2.1 new namespaces



Patrick Smacchia

Patrick Smacchia created NDepend in 2004. The tool became commercial in 2007. Since then, Patrick dedicates all his passion and energy to NDepend dev, providing a relentless effort to make it a more useful and usable product, release after release.
Patrick graduated in Mathematics and Software engineering in 1998. At that time he was already writing code for more than a decade.
Today, with more than 5.000 client companies, including many of the fortune 500 ones, NDepend offers deeper insight and understanding about their code bases to a wide range of professional users worldwide.


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