Same problem! Listening in...

.netcore does seem able to use
System.Configuration.ConfigurationManager
and throws the exception you posted when it encounters it.
Look for code such as:

ConfigurationManager.AppSettings.Get("SomeValue")

I'm having this same issue with .netcore 2.0 at runtime. I'm getting an error
unhandled exception system.io.filenotfoundexception Could not load file or assembly 'System.Configuration.ConfigurationManager
I don't seem to be able to get rid of this issue even though it is compiling with no problems.
Does anyone have an idea of how to fix this?
Thanks!

I fixed the problem I had. I was using the libraries that used System.Configuration.ConfigurationManager in another solution. When I used NuGet to add the System.Configuration.ConfigurationManager in the solution that called these other libraries it worked.

Installing Nuget package for System.Configuration.ConfigurationManager has solved the problem for us using .net core 2.0.

My problem also solved Installing Nuget package for System.Configuration.ConfigurationManager

InvalidOperationException: Cannot find compilation library location for package

The above solutions seem more like a hack? I am feeling reluctant to add an "unused" reference to my .NET framework 4.7.2 project (System.Configuration.ConfigurationManager). What happens in the future if a teammate sees this reference as unused and removes it? The build will still pass, but will result in runtime errors.

Does anyone have a proper fix?

Also in this situation - I am converting a class library to .NET standard for an enterprise solution - we may have 50+ projects that consume this - so potentially I need to add this reference in 50 places?

Hi all!
This library does not officially support .NET core yet. I assume everybody experiencing this issue is trying to use it as such?

Ah. The system.configuration.configurationmanager package is not unused. It is included with .NET versions which aren't core, which is why it's not defined in this package. It seems like some are getting this to work by adding the reference manually, but I can't endorse this since we haven't tested this internally. Core support is something we're interested in though and I'll let you all know when I know more!

I'll close the issue for now - but if anybody is having this issue not in .NET core, let me know!

any solution for consuming compatibility package which could help in consuming framework component in .net core

please help i am facing comparability issue.

Hi,

If you're using the .net core you need to install the system.configuration.configurationamanger nuget package.

Best regards,
John

Hi,
I have a .NET FX46 referencing a NET standard lib which uses Serilog. The build on my local works but on build agent does not. The error is System.IO.FileloadException: could not load file or assembly System.Configuration.configurationManager, version=4.0.0.0, Culture=neutral, PublicKeyToken=.... from Serilog.Settings.AppSettings. I tried adding System.Configuration.configurationManager directly to my FX project, the build still fails. I also tried adding

<PropertyGroup>
  <_HasReferenceToSystemRuntime>true</_HasReferenceToSystemRuntime>
</PropertyGroup>

No luck. Would you please help?
Thank you!

The same problem like Yunhan-Zheng

Hi @Yunhan-Zheng @parad74 - What error are you getting after you've added System.Configuration.configurationManager?

So... this Nuget package works when I use it in .NET Core while in MacOS??

What happens when I use for example this function: ConfigurationManager.OpenExeConfiguration(...) ?

It worked for me to add the following tag in the csproj:

<Reference Include="System.Configuration">
  <HintPath>..\..\..\..\..\..\..\Windows\Microsoft.NET\Framework64\v4.0.30319\System.Configuration.dll</HintPath>
</Reference>

before of </Project>

I fixed the problem I had. I was using the libraries that used System.Configuration.ConfigurationManager in another solution. When I used NuGet to add the System.Configuration.ConfigurationManager in the solution that called these other libraries it worked.

Ty

I had the same issue, the reason was a package conflict between the same package in different project I solved by installing the same version in all my projects.

<ItemGroup>
<Reference Include="System.Configuration.ConfigurationManager">
<HintPath> C:\Users\PauloFernando\.nuget\packages\system.configuration.configurationmanager\4.7.0\lib\netstandard2.0\System.Configuration.ConfigurationManager.dll `

Can you add a reference at your .csproj

Same issue. Any solution?

Exception while executing function: EntityPlugin <--- Could not load file or assembly 'System.Configuration.ConfigurationManager, Version=4.0.3.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. The system cannot find the file specified.

I install Microsoft.Windows.Compatibility NuGet but same issue.

Today I've found another workaround, that works for me, but I have no idea why. At the beginning of my application (in my case - in the [OneTimeSetUp] of NUnit tests), I do

System.Reflection.Assembly.Load("System.Configuration.ConfigurationManager");

I fixed the problem I had. I was using the libraries that used System.Configuration.ConfigurationManager in another solution. When I used NuGet to add the System.Configuration.ConfigurationManager in the solution that called these other libraries it worked.

This fixed my problem too. Just adding nuget package to the running project.

I had the same problem when I tried to connect to CosmosDb from a time triggered Azure Function.
Here what I did to solve the problem
1- downgraded the projecto to netcoreapp3.1
2- Used the Azure Function V3
3- used Microsoft.NET.Sdk.Functions version 3.1.1(any version 3)
4- Added <_FunctionsSkipCleanOutput>true</_FunctionsSkipCleanOutput> in the property Group tag in the .csproj

It worked for me. Hope this helps