NightOwl888 commented on issue #323:
URL: https://github.com/apache/lucenenet/issues/323#issuecomment-668208832
Thanks for the report.
What packages do you have from `Microsoft.Extensions.Configuration`
installed in your project? And what versions?
I was able to reproduce this. I still need to look into why this is
happening. The `Providers` property hasn't changed from
`IEnumerable<IConfigurationProvider>`, so it is a bit odd that it is throwing
an exception.
Fortunately, this time there is a workaround. You can bypass the
`ConfigurationRoot` provider by injecting your own at application startup. Just
provide your existing `IConfiguration` instance to `ConfigurationFactory`, or
use the below code as the default.
```c#
IConfiguration configuration = new
ConfigurationBuilder().AddEnvironmentVariables("lucene:").Build();
Lucene.Net.Configuration.ConfigurationSettings.SetConfigurationFactory(new
ConfigurationFactory(configuration));
```
Here is one way to implement `ConfigurationFactory`. You could alternatively
use a `Func<IConfiguration>` in the constructor and actively read it on the fly
from its source if you need to.
```c#
public class ConfigurationFactory :
Lucene.Net.Configuration.IConfigurationFactory
{
private readonly IConfiguration configuration;
public ConfigurationFactory(IConfiguration configuration)
{
this.configuration = configuration ?? throw new
ArgumentNullException(nameof(configuration));
}
public IConfiguration GetConfiguration() => configuration;
}
```
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