Reference .Net lib in a .Net Core project

Question

I currently have a ASP.Net Core app, which implies that all my class libraries are .Net core class libraries.

In one of those libraries, I need to use iTextSharp, which does not support .Net Core. I don't really care to execute this on linux, I just like the modularity of Asp.Net Core and all the template with the modern web development.

I found this: Unable to use iTextSharp with ASP.NET 5 Core which seems to indicate that we can reference the .Net 4.6 in a .Net core app.

But since VS2017, there is no more project.json, since it's directly included in the *.csproj.

So:

Is it possible to reference a .Net 4.6(well a library from .Net full framework) in a .Net core library(if we are not gonna use it somewhere else than IIS?
1. If yes, how?
2. If no, do you have any idea what I can do?

BTW, have you checked "unofficial" iTextSharp builds that can be referenced from .NET Core apps, like nuget.org/packages/iTextSharp.LGPLv2.Core ? — Vitaliy Fedorchenko
– Vitaliy Fedorchenko, Commented Apr 5, 2017 at 16:30
@VitaliyFedorchenko I wanted to test your approach(for some other needs(tests), it would help if its true .net core), so I created a .NetCore project, imported the package you indicated. I can create the PdfReader, but I can't find the SimpleTextExtractionStrategy class in it? — J4N
– J4N, Commented Apr 18, 2017 at 16:25
I guess SimpleTextExtractionStrategy doesn't exist in iTextSharp 4.1.6 ( github.com/schourode/iTextSharp-LGPL ) and was added later. All versions after 4.1.6 are non LGPL and require commercial license. If you're commercial iTextSharp user you contact their representatives and ask for .NET Core support. — Vitaliy Fedorchenko
– Vitaliy Fedorchenko, Commented Apr 18, 2017 at 17:24

Andrii Litvinov · Accepted Answer · 2017-04-05 17:57:34Z

3

Check out the article Use ASP.NET Core 1.1 with .NET 4.6.

You simply need to edit your *.csproj file and replace netcoreapp1.1 to net46. When you do that your .NET Core app will run on full framework and you will be able to install iTextSharp package.

EDIT: To resolve issue with webpack middleware you need to directly reference System.Net.Http 4.3.1 package as mentioned in this comment.

edited Apr 5, 2017 at 17:57

answered Apr 5, 2017 at 15:36

Andrii Litvinov

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11 Comments

J4N Over a year ago

I was just reading it, I tried, now it compile but I get some exception `Could not load file or assembly 'System.Diagnostics.DiagnosticSource, Version=4.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51' or one of its dependencies. HRESULT : 0x80131040, any idea?

J4N Over a year ago

It's on app.UseWebpackDevMiddlewareof the Startup.cs

J4N Over a year ago

I tried to add the corresponding nugget package, but still got this error. Not sure why, I got more info on this HRESULT: The located assembly's manifest definition does not match the assembly reference.

Andrii Litvinov Over a year ago

That could be because previously package was referenced for .net core app. Try to remove package and install again.

Andrii Litvinov Over a year ago

Try directly reference System.Net.Http 4.3.1 package as mentioned in this comment github.com/aspnet/JavaScriptServices/issues/…

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