target framework 7.0

1. Does C# 7.0 work for .NET 4.5?

I created a project in Visual Studio 2017 RC to check whether I can use new C# 7.0 language features in a .NET Framework 4.5 project. It seems to me that after referencing System.ValueTuple NuGet, new tuples are working fine. Is there anything else I should think about, or is this going to work?

2. Compiler targetting C# 7.0 instead of 7.3 - Visual Studio 2019 - .NET 4.7.2

am trying to use a feature of C# 7.3 in an ASP.NET application running under .NET Framework 4.7.2. When I browse to a page with the C# 7.3 statement I get the error message “Feature ‘default literal’ is not available in C# 7.0. Please use language version 7.1 or greater.” On going to Project Properties -> Build -> Advanced, my ability to explicitly select the C# version is greyed out with a message “Automatically selected based on framework version”.

Clicking “Why can’t I select a different C# version” takes me to a page that tells me that the default for .NET Framework is 7.3 which it clearly isn’t. I’ve created a Directory.Build.props to try and force this to use 7.3 but it is ignored, and in any case should not be necessary.

Why is this greyed out and why is it selecting the wrong version of C#?

3. 4 ways to enable the latest C# features

The C# language evolves regularly. C# 7.1 is available with Visual Studio 2017 Update 3 (version 15.3). However, the new functionalities of C# 7.1 are not available by default. By default, the version of C# is the latest major version (currently 7.0). You must explicitly edit the configuration of your projects to set the version of the language.

4. C# language versioning

The latest C# compiler determines a default language version based on your project's target framework or frameworks. Visual Studio doesn't provide a UI to change the value, but you can change it by editing the csproj file. The choice of default ensures that you use the latest language version compatible with your target framework. You benefit from access to the latest language features compatible with your project's target. This default choice also ensures you don't use a language that requires types or runtime behavior not available in your target framework. Choosing a language version newer than the default can cause ha

5. Understanding the project file

Microsoft Build Engine (MSBuild) project files lie at the heart of the build and deployment process. This topic starts with a conceptual overview of MSBuild and the project file. It describes the key components you'll come across when you work with project files, and it works through an example of how you can use project files to deploy real-world applications.

6. Error NETSDK1045: The current .NET SDK does not support targeting .NET 6.0

I spent 2 hours trying to figure out what's wrong with my pipeline for Azure Functions .NET6 (on Windows).