net10.0-windows7.0 
namespace System.Configuration
{
    [TypeForwardedFrom("System.Configuration, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")]
    public class ConfigurationErrorsException : ConfigurationException
    {
        public override string Message { get; }
    }
}
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Reference this API
.NET
5.06.07.08.09.010.0
.NET Core
2.02.12.23.03.1
.NET Framework
2.03.03.54.04.54.5.14.5.24.64.6.14.6.24.74.7.14.7.24.84.8.1
.NET Standard
2.02.1
Information specific to net10.0
Platforms This API is only available when you target a specific platform:
Windows
7.0
Information specific to net10.0-windows7.0
Assemblies

System.Configuration.ConfigurationManager , Version=10.0.0.0, PublicKeyToken=cc7b13ffcd2ddd51

System.Configuration.ConfigurationManager , Version=9.0.0.0, PublicKeyToken=cc7b13ffcd2ddd51

Referencing

Your project needs a package reference to System.Configuration.ConfigurationManager.

Package System.Configuration.ConfigurationManager (10.0.0-preview.1.25080.5) net9.0
Platform Restrictions

The property getter is supported on any platform except for these:

  • Browser
  • wasi
  • Built-in API
  • Package-provided API