How can I list all of the configuration sources or properties in ASP.NET Core?

I want to ensure that a particular configuration property is being read from a configuration source. I was going to print out all of the configuration sources (or print out all of the configuration properties), but I can’t seem to figure out how to do that.

Can this be done?

You can get a list of all the keys discovered by all configuration sources by doing:

var keys = builder.Build().AsEnumerable().ToList();

I haven't found a way to build each configuration source separately so you could see the sources individually.

In debug mode, you can see the private members and peek into each configuration source:

[![Debug configuration providers][1]][1]


[1]:

From .NET Core 3.0+ you can cast your `IConfiguration` to a `IConfigurationRoot` and use the [GetDebugView][1] extension method. That will generates a human-readable view of the configuration showing where each value came from. E.g.

```csharp
var root = (IConfigurationRoot)Configuration;
var debugView = root.GetDebugView();
```

Sample output to `debugView`:
```
applicationName=Project.Name (Microsoft.Extensions.Configuration.ChainedConfigurationProvider)
ASPNETCORE_ENVIRONMENT=Development (EnvironmentVariablesConfigurationProvider)
ASPNETCORE_HTTPS_PORT=32774 (EnvironmentVariablesConfigurationProvider)
ASPNETCORE_LOGGING:
CONSOLE:
DISABLECOLORS=true (EnvironmentVariablesConfigurationProvider)
ASPNETCORE_URLS=https://+:443;http://+:80 (EnvironmentVariablesConfigurationProvider)
DOTNET_RUNNING_IN_CONTAINER=true (EnvironmentVariablesConfigurationProvider)
DOTNET_USE_POLLING_FILE_WATCHER=1 (EnvironmentVariablesConfigurationProvider)
AllowedHosts=* (JsonConfigurationProvider for 'appsettings.json' (Required))
Kestrel:
Certificates:
Development:
Password=xxxxxxxx-xxxxx-xxxx-xxxx-xxxxxxxxxx (JsonConfigurationProvider for 'secrets.json' (Optional))
EmailOptions:
EnableSsl=False (JsonConfigurationProvider for 'appsettings.json' (Required))
ENVIRONMENT=Development (Microsoft.Extensions.Configuration.ChainedConfigurationProvider)
HOME=/root (EnvironmentVariablesConfigurationProvider)
HOSTNAME=2cb0f5c24cc0 (EnvironmentVariablesConfigurationProvider)
HTTPS_PORT=32774 (Microsoft.Extensions.Configuration.ChainedConfigurationProvider)
NUGET_FALLBACK_PACKAGES=/root/.nuget/fallbackpackages;/root/.nuget/fallbackpackages2 (EnvironmentVariablesConfigurationProvider)
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin (EnvironmentVariablesConfigurationProvider)
PWD=/app (EnvironmentVariablesConfigurationProvider)
RUNNING_IN_CONTAINER=true (Microsoft.Extensions.Configuration.ChainedConfigurationProvider)
URLS=https://+:443;http://+:80 (Microsoft.Extensions.Configuration.ChainedConfigurationProvider)
USE_POLLING_FILE_WATCHER=1 (Microsoft.Extensions.Configuration.ChainedConfigurationProvider)
```

[1]:

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Recently, I have been faced a similar problem.
I found the solution to a task here:

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public static List<string> AllConfigurationKeys(this IConfigurationRoot root)
{
(string Value, IConfigurationProvider Provider) GetValueAndProvider(
IConfigurationRoot root,
string key)
{
foreach (IConfigurationProvider provider in root.Providers.Reverse())
{
if (provider.TryGet(key, out string value))
{
return (value, provider);
}
}

return (null, null);
}

void RecurseChildren(
HashSet<string> keys,
IEnumerable<IConfigurationSection> children, string rootPath)
{
foreach (IConfigurationSection child in children)
{
(string Value, IConfigurationProvider Provider) valueAndProvider = GetValueAndProvider(root, child.Path);

if (valueAndProvider.Provider != null)
{
keys.Add(rootPath + ":" + child.Key);
}

RecurseChildren(keys, child.GetChildren(), child.Path);
}
}

var keys = new HashSet<string>();
RecurseChildren(keys, root.GetChildren(), "");
return keys.ToList();
}