C# 10–Change an existing project to file scoped namespaces

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• C# 10–Change an existing project to file scoped namespaces

C# 10 introduces file scoped namespaces. This allows you to remove the ‘{}’ when your source file only has one namespace(like most files typically have).

So instead of writing:

	namespace ExampleApp
	{
	class ExampleClass
	{
	}
	}

view raw ExampleClass.cs hosted with ❤ by GitHub

you can now write:

	namespace ExampleApp;
	class ExampleClass
	{
	}

view raw ExampleClassUpdated.cs hosted with ❤ by GitHub

To apply this for an existing project written in C# 9 or lower, you can do this in one go.

Therefore set the language version of your project to C# 10:

	<Project Sdk="Microsoft.NET.Sdk">
	<PropertyGroup>
	<TargetFramework>net6.0</TargetFramework>
	<LangVersion>10</LangVersion>
	</PropertyGroup>
	</Project>

view raw ExampleApp.csproj hosted with ❤ by GitHub

Now we need to update our .editorconfig file and add the following line:

	[*.cs]
	csharp_style_namespace_declarations=file_scoped:suggestion

view raw .editorconfig hosted with ❤ by GitHub

After doing that Visual Studio will help us out and we can use “Fix all occurences in Solution” to apply it in one go: