Your compiler may not necessarily understand every value if it's older. The following table shows all current C# language versions. For more information, see Customize your build. Add the following to a file in your solution directory: īuilds in all subdirectories of the directory containing that file will use the preview C# version. You typically do that in your solution directory. To configure multiple projects, you can create a file that contains the element.
The value preview uses the latest available preview C# language version that your compiler supports. For example, if you explicitly want access to preview features, add an element like this: You can set the language version in your project file. See #error (C# Reference) for more information. This makes the compiler report a compiler error, CS8304, with a message containing the compiler version being used and the current selected language version. To know what language version you're currently using, put #error version (case sensitive) in your code. Under the Build tab, the Advanced pane displays the version selected. You can see the language version in Visual Studio in the project properties page. You use the latest features with that preview in any environment, without affecting projects that target a released. When your project targets a preview framework that has a corresponding preview language version, the language version used is the preview language version. The compiler determines a default based on these rules: Target Check the Mono page for C# for Mono compatibility with C# versions. NET versions are supported by versions of Visual Studio for Mac. Check the Visual Studio for Mac platform compatibility page for details on which. NET versions are supported by versions of Visual Studio. NET 5 and newer versions.Ĭheck the Visual Studio platform compatibility page for details on which. Choosing a language version newer than the default can cause hard to diagnose compile-time and runtime errors.Ĭ# 11 is supported only on. This default choice also ensures you don't use a language that requires types or runtime behavior not available in your target framework. You benefit from access to the latest language features compatible with your project's target. The choice of default ensures that you use the latest language version compatible with your target framework.
Visual Studio doesn't provide a UI to change the value, but you can change it by editing the csproj file. The latest C# compiler determines a default language version based on your project's target framework or frameworks.
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