Is ConfigurationManager.AppSettings available in .

问题:

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?

回答1:

Yes, ConfigurationManager.AppSettings is available in .NET Core 2.0 after referencing NuGet package System.Configuration.ConfigurationManager.

Credits goes to @JeroenMostert for giving me the solution.

回答2:

Once you have the packages setup, you'll need to create either an app.config or web.config and add something like the following:

<configuration>
  <appSettings>
    <add key="key" value="value"/>
  </appSettings>
</configuration>

回答3:

I installed System.Configuration.ConfigurationManager from Nuget into my .net core 2.2 application.

I then reference using System.Configuration;

Next, I changed

WebConfigurationManager.AppSettings

to ..

ConfigurationManager.AppSettings

So far I believe this is correct.