I am converting an existing .Net framework 4.6.2 Project into a .Net core project. I have some of the DLLs in the .Net framework 4.6.2, while some DLLs are not supported in .Net core. Below is the list of those DLLs. Can any one give me the solution?
System.ComponentModel.Composition
System.Runtime.Remoting
system.serviceModel
The following is based on a comment I added to the question:
System.Web and System.ComponentModel.Composition are both supported and provided for .NET Core version 2.0, as can be seen here and here.
(as a side note: https://apisof.net/ is a wonderful resource, provided by Microsoft to aid in figuring out which APIs are available in the different .NET platforms).
But System.Runtime.Remoting is not supported by .NET Core at this time.
The listing for System.ServiceModel shows that it is supported in .NET Core, but only when Platform Extensions is included along side it.
If you need access to Windows or .NET Framework specific APIs, then it's recommended that you don't use .NET Core for the project or create a .NET Standard class library/project which includes the .NET Framework specific code and consume the outputs of that.
The following are some resources to help with .NET Core and .NET Framework API specific issues:
https://apisof.net/
Immo Landwerth's videos on what .NET Standard is, and how it relates to the different .NET Platforms (he's the PM for .NET Standard)
A blog post I wrote about .NET Standard and how it fits into the .NET ecosystem
A blog post from codeshare.co.uk describing the key differences between .NET Framework and .NET Core
A blog post from Stackify discussing the differences in .NET Framework and Core API space
Related
I currently have a webforms website using .net 4.5.
I would like to add a class library with entity framewrok.
I want to make sure that this class library works with dotnet core and my existing webforms project.
With all the versions of .net, it is very confusing.
From what I gathered, dotnet standard maybe used as the middle ware for this type a situation. But I'm not sure this is true.
Any suggestions?
Yes, you'll have to use the .NET Standard and Entity Framework Core. .NET Framework will be able to interface with the .NET Standard
I would start up with https://www.youtube.com/watch?v=ECNLyvxLnuQ
There's not a lot of docs on standard, but this will give you some conceptual understanding
Notice that "ASP.NET vs ASP.NET Core" and "Entity Framework vs Entity Framework Core" are completely different frameworks, even though which were named similarly.
ASP.NET and Entity Framework targets .NET Framework which means they can only work on .NET Framework.
ASP.NET Core and Entity Framework Core targets .NET Standard which means they can work on both .NET Framework and .NET Core.
WebForms bases on ASP.NET, and there is no (and not planned) migration for it on ASP.NET Core, so the old WebForms projects will never be able to work on .NET Core.
It is a great quantity of the task migrating from ASP.NET MVC to ASP.NET Core MVC, and WebForms is even impossible.
If you really need to run your project on .NET Core, there will be a complete refactoring of your whole project:
Refactoring your WebForms project to ASP.NET Core MVC (Completely redevelop the whole project)
Refactoring your Entity Framework data definitions to Entity Framework Core (It only supports code-first and database-first, there is no model-first any more)
Make sure that all referenced .NET libraries target .NET Standard or .NET Core and reference them on nuget. If not, re-target an alternative.
If your project is planned to be hosted on Linux server and referenced some native libraries, you have to get the equivalent .so libraries instead of .dll libraries.
I am reading an ebook about Docker and Microservices. It referred the .net core was lightweight compared with traditional .net standard.
I don't quite get the story behind it. Can someone give some explanation about this?
This is because .Net Core is optimized for microservices and dockers.
In short, .Net Core doesn't offer as many things as another classic implementation of .Net Standard, reducing its size which even allows for an app to be packaged with all dependencies (and so not needing any installation of .Net on the running machine). This is why I think it could be called lightweight.
See :
https://msdn.microsoft.com/en-us/magazine/mt842506.aspx
https://learn.microsoft.com/en-us/dotnet/standard/choosing-core-framework-server
About light weight of .net core app
I am reading an ebook about Docker and Microservices. It referred the
.net core was lightweight compared with traditional .net standard.
I think here you are referring to .net core is lightweight than .net frameworks as .net standard are just API specifications for implementing base class libraries by different frameworks.
Please refer to below link for more information:
https://www.infoq.com/news/2017/10/dotnet-core-standard-difference/
https://medium.com/wolox-driving-innovation/net-core-vs-net-framework-a694f1fbdb26
Now coming back to why .net core framework is lightweight .net 4.5 or other frameworks as it's modular. When you create or run an application you don't need to install all dependencies which you do not need unlike .net 4.5 or other frameworks where everything is installed.
Basically, .Net framework has been split into individual pieces implemented using CoreFX for .net core framework which makes .Net core lightweight.
Link for details - https://www.tutorialspoint.com/dotnet_core/dotnet_core_managed_extensibility_framework.htm
I have followings projects:
.NET Core 2.0 Web Application
.NET Standard 2.0 Class library &
.NET Framework 4.5 Class Library.
I add reference of .net framework class library to asp.net core web api project. and it seems it works very well.
I am wondering why it's possible to add reference of .NET Framework class library project to ASP.NET Core Web API or MVC?
It's not supposed to allow adding only Standard or Core libraries references to Core projects?
Is this core Web project with .NET Framework class libraries references still cross platform?
UPDATE
According to Phiter comment:
"If you import a .net framework library to your project it'll no longer be cross platform, but you can do it freely if you want to. They allow it because you might want to use .net core and still be on windows."
So if this is a reason, if I want to bind my project to .NET Framework and remain on windows why I use Core Web Project from the first place?
I thought we use core projects for cross platform ability and if not, the .Net framework is not a better option?
UPDATE
mason comment:
"Nothing funny: ASP.NET Core project doesn't have to run on .NET Core. It can also be run on .NET Framework.
Just because it's called 'Core' doesn't mean they're related. They could have called it ASP.NET FancyPants and had it run on .NET Core and .NET Framework and you wouldn't be as confused. Microsoft just sucks at naming things."
UPDATE (November 12, 2018)
A first look at changes coming in ASP.NET Core 3.0 - Fully leveraging .NET Core
As announced on the .NET Blog earlier this month, .NET Framework will get fewer of the newer platform and language features that come to .NET Core moving forward, due to the in-place update nature of .NET Framework and the desire to limit changes there that might break existing applications. To ensure ASP.NET Core can fully leverage the improvements coming to .NET Core moving forward, ASP.NET Core will only run on .NET Core starting from 3.0. Moving forward, you can simply think of ASP.NET Core as being part of .NET Core.
Customers utilizing ASP.NET Core on .NET Framework today can continue to do so in a fully supported fashion using the 2.1 LTS release. Support and servicing for 2.1 will continue until at least August 21, 2021 (3 years after its declaration as an LTS release) in accordance with the .NET Core support policy.
This was just added as part of .NET Standard/Core 2.0. As long as the .NET Framework dll only references things in the .NET Standard, it will use type forwarding to the .NET Core implementations.
I do not know what made Microsoft allow referencing .net framework class library into .net core project but as a programmer, I am happy with this allowance.
You see allowing .net core application to reference .net framework libraries is useful in case you want to start with windows and are planning to go cross platform in the future.
We are in a stage where many useful open source libraries do not fully support .net core till the date of this post, masstransit is an example, so when I am developing a new software I will be using .net core project that depends on such libraries and I will update them later when they support .net core.
Well, I know the ASP.NET Core v1.1 is fresh, but I am little playing a with it and I am a bit confused about the right class library project choosing in the solution. So here is a scenario:
I start in the Visual Studio 2017 with ASP.NET Core web application project template and choose sub-branch ASP.NET Core (= not with .NET Framework).
Ok, than I would like to add a class library project, but there are two possibilities:
.NET Core Library
.NET Standard Library
Well, ASP.NET Core v1.0 did not support common class libraries, but it seems v1.1 have no problem with that. So result is, I can reference both types.
So my question - is it ok to reference .NET Standard Library to ASP.NET Core project? Or should I reference .NET Core Library only?
You can use .NET Standard Library with .Net Core 1.0. The Standard library is trying to set a common API for the cross platform .net APIs.
You could use it in your project to get experience with it, but choose what makes sense for your class requirements and timeline.
This site has a good article on .NET Standard Library
I have a big class library written in .NET 4.0 but when I reference it in a Store App that uses .NET Core, it shows an error. And further, Microsoft just released .NET Core for the next version of .NET.
I want to know what type of project will be able to be shared by both .NET 4.6 and .NET Core? Is a class library able to do that?
It seems that the release of .NET Core specialized for Store Apps causes confusion for me.
If you have a PCL (Portable Class Library) that works for Metro apps, it will definitely run on the fully fledged .NET (aka, your normal ASP.NET, WF, WPF applications).
That means that you don't have to do anything, besides porting your existing library to be compatible with the PCL you choose.
There is a new target called dotnet which you can use to target the platforms DNX, UWP and .Net 4.6. Effectively, this libraries are build against .Net Core packaged libraries instead of the libraries of the full .Net Framework.
Read more here: https://oren.codes/2015/07/29/targeting-net-core/ and related posts.