core/release-notes/3.0/api-diff/Asp.Net/3.0.0_Microsoft.Extensions.Configuration.FileExtensions.md

Microsoft.Extensions.Configuration.FileExtensions

 {
     namespace Microsoft.Extensions.Configuration {
-        public abstract class FileConfigurationProvider : ConfigurationProvider {
+        public abstract class FileConfigurationProvider : ConfigurationProvider, IDisposable {
+            public void Dispose();
+            protected virtual void Dispose(bool disposing);
+            public override string ToString();
         }
     }
 }