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Is there any difference between .NET 2 and .NET 4 assemblies running under .NET 4
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Closed 6 months ago.
Summary
I am maintaining a ASP.NET Web Forms 4.0 VB.NET project at my company
image from project's web.config
Because of Improper Handling of Exceptional Conditions in Newtonsoft.Json
I need to upgrade the version of Json.NET to 13.0.1 about
ASP.NET Web Forms 4.0 VB.NET project
the JsonNet version in Web Forms project's Bin folder is .NET2.0 & 8.0.3.(the project I am maintaining)
I found that you can replace the Newtonsoft.Json.dll with new dll(.NET4.0 & 13.0.1) straightly on the old Web Forms 4.0 project on IIS server.
And the original version is .NET2.0 & 8.0.3.
No error result, the porject runs well
I feel the two version are compatible
My problem is why web forms 4.0 can use a NET2.0 dll?
Other
this is what I had dowmloaded from Json.Net github source code.
And this is the all .NET version of the 13.0.1 version Json.NET
tree structure
.NET framework are version compatibility
So .Net framework 2.0 library should work fine on .Net framework 4.0
Also can see Side-by-Side Execution in the .NET Framework
some basic of Web Forms
According to What is Web Forms
ASP.NET Web Forms are:
Based on Microsoft ASP.NET technology, in which code that runs on the server dynamically generates Web page output to the browser or client device.
Compatible with any browser or mobile device. An ASP.NET Web page automatically renders the correct browser-compliant HTML for features such as styles, layout, and so on.
Compatible with any language supported by the .NET common language runtime, such as Microsoft Visual Basic and Microsoft Visual C#.
Built on the Microsoft .NET Framework. This provides all the benefits of the framework, including a managed environment, type safety, and inheritance.
Flexible because you can add user-created and third party controls to them.
I've been keeping my head down working on various projects and apparently Microsoft has been busy making some big changes and it's confusing the hell out of me. ASP.NET Core first came onto my radar when I installed Visual Studio 2017 last year and went to create a new project and suddenly had choices of .NET Framework, .NET Standard, and .NET Core. So I looked into them a little and saw that the latter two are, in some way, abbreviated versions of the full framework. I read this post by Scott Hanselman ASP.NET 5 is dead - Introducing ASP.NET Core 1.0 and .NET Core 1.0 I also found this, which steered me away from ASP.NET Core: Choose between ASP.NET and ASP.NET Core. My takeaway was "Core is new, you're fine to keep using the full framework." So I created a new ASP.NET MVC site using .NET Framework 4.6.2 and Microsoft.AspNet.Mvc 5.2.3.
Since creating that project, I found what seemed like some bugs in both MVC and Entity Framework only to find that the only mention of them on the web seems to be in Core and that's the only place they're being considered being fixed.
Now, today, I'm trying to look up the documentation on System.Web.Mvc.Controller and System.Web.Mvc.JsonResult and it's gone except under Core documentation. I did finally dig it up here where it says it's no longer being maintained?
I understood this much about Core and said, "ok, why should I care? I'm going to keep doing what I'm doing and check back on that when it's done." But now it seems that 4.6.2 is not even supported anymore. Can someone explain what's going on? Is my NET 4.6.2/MVC 5.2.3 project now obsolete before I'm even finished writing it? If not, why has the documentation been retired and hidden away? I'm worried some of my dependencies might not even be available for or compatible with Core.
(This answer is regularly updated whenever a new .NET announcement is made, and it has been updated with details of ASP.NET Core 3.0, .NET 3, and .NET 5)
Microsoft needs a good slapping for the amount of confusion over the past 3 years 5 years over .NET Core / DNX, ASP.NET Core, .NET Standard, .NET 5 and the rest.
(and I'm saying that as a former FTE SE in DevDiv... ("hi from building 16!"))
ASP.NET aka "System.Web" is now dead. WebForms is dead (hurrah!)
ASP.NET MVC launched in 2008 was built on-top of ASP.NET, but bypassed most of the WebForms infrastructure.
ASP.NET MVC has its own versioning separate from ASP.NET and ASP.NET Web API (and ASP.NET Core). You linked to ASP.NET MVC 5's documentation - this is not the same thing as ASP.NET 5.
ASP.NET Web API launched in 2012 is a sibling of ASP.NET MVC, in that it built on-top of ASP.NET too, but had its own class library (System.Web.Http) that didn't share much with ASP.NET MVC (System.Web.Mvc). Attempting to combine an ASP.NET Web API service with an ASP.NET MVC web-application in the same project is an exercise in pain.
ASP.NET MVC 5 was launched in 2014 as an update to ASP.NET MVC 4. It is unrelated to ASP.NET 5.
I do note that ASP.NET MVC 5 was where we had both System.Web.Mvc and Microsoft.Web.Mvc namespaces - which is confusing. Fortunately this was short-lived and irrelevant today.
ASP.NET MVC 6 was never released. It was rolled-into ASP.NET 5 which then became ASP.NET Core. Its goal was to combine ASP.NET MVC and ASP.NET Web API into a single platform.
ASP.NET Core was launched in 2016 as an improved design of ASP.NET MVC 5 but without the dependencies on System.Web.dll or any (now-legacy) IIS dependencies (e.g. the old request pipeline, IHttpHandler and IHttpModule no longer exist).
Note that ASP.NET Core's class library's root namespace is now Microsoft.AspNet and not System.Web. This was a source of confusion for me. This means that upgrading projects from ASP.NET MVC and ASP.NET WebAPI to ASP.NET Core are non-trivial, despite their fundamental architecture of Controllers and Middleware being the same.
.NET Core is a new version of the CLR and BCL which is explicitly portable and runs on Windows, Linux and macOS.
.NET Core 1.0 and .NET Core 2.0's base class libraries were considered anemic compared to the full-fat .NET Framework which is a Windows-exclusive.
With .NET Core 3.0 and the open-sourcing of WinForms, WPF and other components of .NET Framework, .NET Core is now primed as a replacement for .NET Framework in Windows for new application development.
.NET 5 will be the new name of .NET Core after .NET Core 3 is released (.NET 5 is expected around late 2020).
.NET 5 has absolutely nothing to do with ASP.NET 5.0 nor ASP.NET MVC 5.
There is no .NET Core 4 nor .NET Framework 5.0.
"ASP.NET Core in .NET" seems to be the final name for the first release of ASP.NET Core specifically targeting .NET 5 and later.
I note that "Core" is Microsoft's hot branding for the current generation of .NET platforms which work with .NET Core (i.e. they have no Windows dependencies and so are portable). (Just like how Microsoft stuck "Active" onto things in the 1990s if they used COM or ActiveX, e.g. Active Desktop, Active Channels, ActiMates, Active Directory, ActiveSync, etc).
Additionally Entity Framework Core is still lacking a lot of functionality from Entity Framework 6, this is because it's a rewrite, basically - but it will reach parity eventually.
Because there are many .NET runtimes and BCLs currently available (.NET Framework, .NET Core, UWP, Xamarin (which uses Mono), Unity and others) Microsoft introduced .NET Standard which is basically a reboot of the Portable Class Library concept: where Visual Studio projects target a known subset of common functionality instead of a specific implementation. (I just wish they'd start the version numbering from 4 to match .NET Framework instead of starting at 1.0 because that got me thinking about 2001 all over again.) - but the important part is that ASP.NET Core 1 and ASP.NET Core 2 target .NET Standard instead of .NET Core - which means that ASP.NET Core runs on top of the .NET Framework on Windows in addition to running on top of .NET Core as well.
I note that all previous .NET cross-platform compatibility techniques are now obsolete (including targeting Compact Framework subsets, Portable Class Libraries, and even "Shared Projects" in Visual Studio), as they were meant for other editions of .NET which no-longer exist, such as .NET Compact Framework, XNA, Silverlight, and Windows Phone 7's subset.
In May 2019, Microsoft announced ".NET 5". In short, the .NET Framework is being replaced with .NET Core, and the next version of .NET Core after .NET Core 3.0 will be named .NET 5). This announcement does not concern ASP.NET Core at all, other than the fact that .NET 5 will fully support ASP.NET Core 3.0 applications running on it.
Throughout the Covid-themed summer of 2020 Microsoft finalized .NET 5 and ASP.NET Core. As of October 2020, ASP.NET Core's NuGet package versions have jumped from 3.1.x to 5.0.0 - so it looks as though the next major release of ASP.NET Core will be versioned 5.x.x which suggests its release may be named "ASP.NET Core 5" though recent Microsoft blog articles suggest the name will be "ASP.NET Core for .NET 5" - though given that this whole thread was created out of the confusion over "ASP.NET MVC 5" vs "ASP.NET 5" I'm sure that naming it either "ASP.NET Core 5" or "ASP.NET Core for .NET 5" will absolutely not be confusing at all, no sir-ee-bob!
In summary:
ASP.NET MVC 5:
ASP.NET MVC 5 was a short-lived successor to ASP.NET MVC 4.
It was released alongside ASP.NET Web API 2 in 2014.
It actually ran on top of ASP.NET 4 (i.e. .NET 4.x version of System.Web.dll). Note that the entire ASP.NET MVC library is now obsolete.
ASP.NET 5 was EOL'd and rebranded as ASP.NET Core and it includes the functionality of "ASP.NET MVC 5" built-in.
ASP.NET Core 1 and ASP.NET Core 2 can run on either .NET Core (cross-platform) or .NET Framework (Windows) because it targets .NET Standard.
ASP.NET Core 3 now only runs on .NET Core 3.0.
ASP.NET Core 4 does not exist and never has.
ASP.NET Core 5 exists (as of August 2020) however its official name seems to be "ASP.NET Core for .NET 5" and it only runs on .NET 5.
All of them (in chronological order):
ASP.NET 1 - 2001. Included WebForms. Ran on .NET Framework 1.0 and 1.1. System.Web.dll.
ASP.NET 2.0 - 2005. Included WebForms. Ran on .NET Framework 2.0. System.Web.dll.
ASP.NET MVC 1 and ASP.NET MVC 2 - 2008-2009. Ran on top of ASP.NET 2.0. System.Web.Mvc.dll.
ASP.NET 4.0 - 2010. Included WebForms. Ran on .NET Framework 4.0. There was no ASP.NET 3.0. System.Web.dll.
ASP.NET MVC 3 and ASP.NET MVC 4 - 2010-2013. Ran on top of ASP.NET 4.0. System.Web.Mvc.dll.
ASP.NET Web Api 1 - 2012. Ran on top of ASP.NET 4.0. System.Web.Http.dll.
ASP.NET MVC 5 - 2013. Just another update to ASP.NET MVC. Ran on top of ASP.NET 4.0 but could also run independently without System.Web.dll under OWIN.
ASP.NET Web API 2 - 2013. Sibling to ASP.NET MVC 5. Could also run without ASP.NET 4.0 under OWIN.
ASP.NET MVC 6 - 2014-2015. Aborted after reaching Release Candidate status and rebooted as ASP.NET Core MVC 1.0 in 2016 which is the MVC and Web API component of ASP.NET Core 1.
ASP.NET 5 - 2014. Major reboot of ASP.NET described here. The main changes included merging MVC, Web Pages and Web API - and the removal of WebForms. ASP.NET 5 reached Release Candidate status but was then rebranded as ASP.NET Core. There has never been an ASP.NET 6.
ASP.NET Core 1 - 2016. Runs on either .NET Framework 4.5 or .NET Core 1.0.
.NET Core - 2016. Portable and minimal .NET runtime and class library.
.NET Standard - 2017. A way for programs to target a common set of functionality that will be present in all .NET implementations (.NET Framework 4.5 and later, .NET Core 2.0 and later, Xamarin, etc).
ASP.NET Core 2 - 2017-2018: where we are today. Runs on either .NET Framework 4.6.1 or .NET Core 2.0. (As of late 2018 there is now ASP.NET Core 2.1).
ASP.NET Core 3 - In late October 2018 Microsoft announced ASP.NET Core 3.0 will now only run on the upcoming .NET Core 3.0 (so it will no-longer run on the .NET Framework 4.7.x). This is a controversial move because it means there is now no upgrade path from ASP.NET Core 2.x to ASP.NET Core 3.x for applications that run on the .NET Framework 4.7.x because of dependencies that don't support .NET Core yet, which means there likely won't be a .NET Standard 3.0.
.NET 5 - May 2019: Microsoft announced the next version of .NET Core after .NET Core 3.1 would not be called ".NET Core 4.0" nor ".NET Core 5.0" but would jump to version number 5.0 and ditch the "Core" branding, hence ".NET 5.0".
ASP.NET Core 3.0 on .NET 5 - In the May 2019 announcement of .NET 5, Microsoft also stated that ASP.NET Core 3.0 applications will run on .NET 5. It is currently unclear if ASP.NET Core 2.x applications will be able to run unmodified on .NET 5.
ASP.NET Core vNext on .NET 5 - August 2020: With the impending release of .NET 5, Microsoft has bumped the version numbers of the NuGet packages for ASP.NET Core to 5.0.0. Microsoft has not yet formally/officially referred to this new release of ASP.NET Core as "ASP.NET Core 5", but I see it as a foregone conclusion.
ASP.NET Core for .NET 5 A more recent blog article from September 2020 suggests that Microsoft is referring to the next version of ASP.NET Core as "ASP.NET Core for .NET 5" (yes, that's a mouthful - at least it isn't as ambiguous as earlier names).
Update (September 2021): It seems that the official name is now ASP.NET Core in .NET 5, and for .NET 6 it seems they've gone with ASP.NET Core in .NET 6 as well.
Timeline and block diagram
(I got carried away making this...)
This answer will try to focus only on ASP.NET MVC 5, and as little ASP.NET Core as possible.
Product Lifecycle
Microsoft still supports this (so fortunately it is not a "short-lived" release from the other answer), and there is not yet an end-of-life announcement,
https://www.asp.net/support
Framework/Product Retirement
ASP.NET MVC 4 July 1st, 2019
ASP.NET MVC 5
So if you like, you can keep using it (like VB6 and classic ASP users, who are still being supported by Microsoft).
.NET Framework 4.5.2 and above are still fully supported if you do check Microsoft documentation on product lifecycle.
Maintenance
However, you do need to notice ASP.NET MVC 5 is on maintenance mode, as development resources are almost all on ASP.NET Core right now.
You do get,
Unpredictable patch releases from NuGet.org.
If you monitor the relevant NuGet packages, you should notice that even recently Microsoft updates them to remediate security vulnerabilities and so on.
Locked down documentation.
The notice you saw from Microsoft Docs, in fact emphasizes on the very first sentence "We’re no longer updating this content regularly." That makes perfectly sense as ASP.NET MVC 5 is rock solid so you should not expect new materials to be added any more.
Very limited bug fixes and new features.
You said "Since creating that project, I found what seemed like some bugs in both MVC and Entity Framework only to find that the only mention of them on the web seems to be in Core and that's the only place they're being considered being fixed."
Well, it really depends on what "bugs" you are talking about. Like I said earlier, security related issues are still being patched, but bugs with workarounds or functional limitation are least likely to get fixed. It is an open source project, so if you really want, you can fix the issues on your own, as last resort.
On new features side, Microsoft does backport some features from ASP.NET Core, such as dependency injection, new configuration system, to simplify migration at certain degree. But don't expect much.
Migration
Do consider migrating to ASP.NET Core if you can.
I found this fragment from the introduction to this article in Wikipedia to be a great sum up of the great answer provided here as the selected answer. The same was originated in this Microsoft's blog post: https://devblogs.microsoft.com/dotnet/introducing-net-5/
(I'll link every technology mentioned, where possible, to its own Wikipedia article, for further reading.)
Final release of ASP.NET MVC: 28 November 2018. ASP.NET Core has since been released, which unified ASP.NET, ASP.NET MVC, ASP.NET Web API, and ASP.NET Web Pages (a platform using only Razor pages). MVC 6 was abandoned due to Core and is not expected to be released. Core is currently planned to merge into ".NET 5".
which version of mvc is using in asp.net core 2.0? is is MVC 6 or use different name ?
What is .net 5?
what is .net standard ?
these questions are from an interview.plz help
The .NET Standard is a formal specification of .NET APIs that are intended to be available on all .NET implementations.https://learn.microsoft.com/en-us/dotnet/standard/net-standard .ASP.NET5.0 Is Called ASP.NET Core 1.0 and In the ASP.NET Core 1.0 release, Web API is merged with ASP.NET MVC, termed as MVC 6
They're totally unrelated. "MVC 6" was sort of like a codename for Core when it was still in early stages. ASP.NET MVC and ASP.NET Web Api are totally separate from ASP.NET Core. Now, it's just "Core". There is no "MVC" or "Web Api", because Core controllers do both functions. ASP.NET MVC and ASP.NET Web Api live on and although they will probably eventually be deprecated, they could presumably (though not likely at all) get new releases. At the very least, they'll be patched for the foreseeable future.
ASP.NET Core is a complete rewrite from the ground up. It was originally created simply to be a cross-platform alternative to ASP.NET, and I think the original plan was to keep both ASP.NET and ASP.NET Core as potential development options. However, as ASP.NET Core became more competent, it has pretty fully eclipsed ASP.NET; we now have a cross-platform framework that can run on Windows, Mac and Linux and can do virtually anything the Windows-only framework can. Therefore, why keep the Windows-only framework?
Asp.net Core 2.0 is MVC 6 and The framework is 4.6.1
To start with development you need to have VS-2017 and for 1.X you can start with VS-2015.
Please refer the below link for clear presentation of .NetCore 2.0 so that you can get good knowledge to kick start your development.
Official Asp.Net Core Documentation Url
Can anybody tell me what is ASP.NET vNext?
Every new version on .Net is something like .NET 1.0, .NET 2.0, .NET 3.0, .NET 3.5, .NET 4.0 then why this version is not something like ASP.NET 6.0?
vNext is just the name given to product in the pre-release mode, like c# vNext which will apparently be released as C# 6.0, maybe ASP.NET vNext will have a numbering when it releases.
What is ASP.NET vNext?
Microsoft ASP.NET vNext is a smaller and efficient framework as a result of rebuilding the libraries from ground up.
What's new in vNext
Cloud-optimized versions of MVC, Web API, Web Pages, SignalR, and Entity Framework.
MVC, Web API, and Web Pages will be merged into one framework, called MVC 6.
MVC 6 has no dependency on System.Web. The result is a leaner framework, with faster startup time and lower memory consumption.
vNext is host agnostic. You can host your app in IIS, or self-host in a custom process.
Dependency injection is built into the framework. Use your preferred IoC container to register dependencies.
vNext uses the Roslyn compiler to compile code dynamically. You will be able to edit a code file, refresh the browser, and see the changes without rebuilding the project.
vNext is open source and cross platform.
More information:
Overview on asp.net
Getting started with ASP.NET vNext
Blogpost by Scott Hanselman
Blogpost by David Fowler
Contributing to ASP.NET vNext
Sample ASP.NET vNext applications
ASP.NET vNext is the next version of ASP.NET, but it hasn't shipped yet, so it is not an official version. "vNext" is just a working title.
ASP.NET vNext was the code-name for the next generation of ASP.NET, whose official name is ASP.NET 5. As of now ASP.NET 5 is not yet finished and documentation about can be found at http://asp.net/vnext.
ASP.NET 5 is not just an evolution of the previous version(s), it is rebuilt from the ground. Existing ASP.NET applications will run on ASP.NET 5 without modifications, but to take advantage of the new features, such applications will have to be ported to the new version.
Here's a little excerpt of what http://asp.net has to say about ASP.NET 5:
ASP.NET 5 is a lean .NET stack for building modern web apps. We built it from the ground up to provide an optimized development framework for apps that are either deployed to the cloud or run on-premises. It consists of modular components with minimal overhead, so you retain flexibility while constructing your solutions.
ASP.NET 5 includes the following features:
New flexible and cross-platform runtime
New modular HTTP request pipeline
Cloud-ready environment configuration
Unified programming model that combines MVC, Web API, and Web Pages
Ability to see changes without re-building the project
Side-by-side versioning of the .NET Framework
Ability to self-host or host on IIS
New tools in Visual Studio 2015
Open source in GitHub
The changes we made for ASP.NET 5 were based on customer requests and feedback. These changes simplify development, hosting, and maintenance, and are targeted to modern web apps.
Your legacy apps will run on the new version of the ASP.NET without any modifications. However, to take advantage of the new features in ASP.NET 5, you will need to port your existing code to the new framework. You will find many similarities between ASP.NET 5 and earlier versions of ASP.NET, so porting code involves fixing particular issues rather than re-writing the app.
Can you run the same web application (ASP.NET MVC 2) on ASP.NET 2 as well as ASP.NET 4? The application is developed and built for .NET 3.5 SP1.
My initial guess is you can't, due to vast differences in standard web.config files between these two runtimes. Is this correct?
If two web.configs were supplied, one for each ASP.NET version, should it, in principle at least, run correctly?
A .NET 2 app should still run under Framework 4.x, but not necessarily the other way round - that would depend if you've used any framework features that weren't present in the earlier version.