Expose IConfigurationProviders from root

src/Microsoft.Extensions.Configuration.Abstractions/IConfigurationRoot.cs

@@ -2,6 +2,7 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
+using System.Collections.Generic;
 
 namespace Microsoft.Extensions.Configuration
 {
@@ -14,5 +15,10 @@ namespace Microsoft.Extensions.Configuration
         /// Force the configuration values to be reloaded from the underlying <see cref="IConfigurationProvider"/>s.
         /// </summary>
         void Reload();
+
+        /// <summary>
+        /// The <see cref="IConfigurationProvider"/>s for this configuration.
+        /// </summary>
+        IEnumerable<IConfigurationProvider> Providers { get; }
     }
 }

src/Microsoft.Extensions.Configuration.Abstractions/breakingchanges.netcore.json

@@ -0,0 +1,7 @@
+[
+    {
+      "TypeId": "public interface Microsoft.Extensions.Configuration.IConfigurationRoot : Microsoft.Extensions.Configuration.IConfiguration",
+      "MemberId": "System.Collections.Generic.IEnumerable<Microsoft.Extensions.Configuration.IConfigurationProvider> get_Providers()",
+      "Kind": "Addition"
+    }
+]

src/Microsoft.Extensions.Configuration/ConfigurationRoot.cs

@@ -36,6 +36,11 @@ namespace Microsoft.Extensions.Configuration
             }
         }
 
+        /// <summary>
+        /// The <see cref="IConfigurationProvider"/>s for this configuration.
+        /// </summary>
+        public IEnumerable<IConfigurationProvider> Providers => _providers;
+
         /// <summary>
         /// Gets or sets the value corresponding to a configuration key.
         /// </summary>

test/Microsoft.Extensions.Configuration.FunctionalTests/ConfigurationTests.cs

@@ -4,6 +4,7 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
+using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Testing.xunit;
@@ -859,6 +860,23 @@ IniKey1=IniValue2");
             File.Delete(xmlConfigFilePath);
         }
 
+        [Fact]
+        public void CanEnumerateProviders()
+        {
+            // Arrange
+            var config = CreateBuilder()
+                .AddIniFile(_iniFile, optional: true, reloadOnChange: true)
+                .AddJsonFile(_jsonFile, optional: true, reloadOnChange: true)
+                .AddXmlFile(_xmlFile, optional: true, reloadOnChange: true)
+                .Build();
+
+            var providers = config.Providers;
+            Assert.Equal(3, providers.Count());
+            Assert.NotNull(providers.Single(p => p is JsonConfigurationProvider));
+            Assert.NotNull(providers.Single(p => p is XmlConfigurationProvider));
+            Assert.NotNull(providers.Single(p => p is IniConfigurationProvider));
+        }
+
         public void Dispose()
         {
             _fileProvider.Dispose();