Is ConfigurationManager.AppSettings available in .NET Core 2.0?

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I’ve got a method that reads settings from my config file like this:

var value = ConfigurationManager.AppSettings[key];

It compiles fine when targeting .NET Standard 2.0 only.

Now I need multiple targets, so I updated my project file with:

<TargetFrameworks>netcoreapp2.0;net461;netstandard2.0</TargetFrameworks>

But now, the compilation fails for netcoreapp2.0 with the following error message:

Error CS0103 The name ‘ConfigurationManager’ does not exist in the current context (netcoreapp2.0)

Separately, I created a new .NET Core 2.0 console application (only targeting .NET Core 2.0 this time), but likewise there seems to be no ConfigurationManager under the namespace System.Configuration.

I’m quite confused because it’s available under .NET Standard 2.0, so I would expect it to be available in .NET Core 2.0, as .NET Core 2.0 is .NET Standard 2.0 compliant.

What am I missing?

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