The default XML namespace of the project must be the MSBuild XML namespace error after Installing .Net Core 3 in Visual Studio 2017.0

Question

I had 3 projects in a C# solution in Visual Studio 2017, All 3 projects were loaded correctly, but I was getting dependency errors on missing

.NETFramework 4.0
.NETFramework 4.6.1
.NETStandard 1.3
.NETStandard 2.0

Looking online, I saw that I needed .Net Core SDK So I download the latest SDK for .NET Core 3

Now 2 of the 3 projects would not load with the error

The default XML namespace of the project must be the MSBuild XML namespace

Searches on this error all point to needing Visual Studio 2017 for new project file format

But I am already using Visual Studio 2017. So what is causing these projects to not open, did they change it again? How do I fix this?

Thanks

Kamil · Accepted Answer · 2019-10-28 21:28:19Z

2

You need Visual Studio 2019 if you want to use .NET Core 3.
If you want to stay with Visual Studio 2017 for some reasons - you can use .NET Core 2.1 which is supported in Visual Studio 2017.

.NET Core 2.1. has LTS (Long Term Support) which ends in 2021.

edited Oct 28, 2019 at 21:28

answered Oct 28, 2019 at 21:23

Kamil

14k25 gold badges101 silver badges202 bronze badges

Sign up to request clarification or add additional context in comments.

3 Comments

Mich Over a year ago

I just want a consistent product that is backwards compatible like C++. This constant switching of frameworks and making products incompatible is highly bothersome.

Kamil Over a year ago

Well, I agree, but this is pain of all big frameworks. C++ is just a language shipped with few tiny libraries. DotNet is a framework shipped with IDE and multiple language support (C#, VB, F#). You can use Java which is much better in compatibility between releases, but sucks in productivity, there is no WPF or any modern GUI engine (JavaFX is dead I suppose), no builtin MVC magic, RazorPages, and unsigned numbers.

Kamil Over a year ago

C# 8.0 language itself is pretty compatibile with older releases.

Collectives™ on Stack Overflow

The default XML namespace of the project must be the MSBuild XML namespace error after Installing .Net Core 3 in Visual Studio 2017.0

1 Answer 1

3 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

3 Comments

Your Answer

Sign up or log in

Post as a guest

Related