RefApiCompat for isolatedStorage (#28120)

Author: Anipik

src/System.IO.FileSystem/src/MatchingRefApiCompatBaseline.txt

@@ -1,7 +1,8 @@
 Compat issues with assembly System.IO.FileSystem:
+# These are now virtual in the implementation, which should be ok.
 CannotMakeMemberAbstract : Member 'System.IO.FileSystemInfo.Exists' is abstract in the implementation but is not abstract in the contract.
 CannotMakeMemberAbstract : Member 'System.IO.FileSystemInfo.Name' is abstract in the implementation but is not abstract in the contract.
 CannotMakeMemberAbstract : Member 'System.IO.FileSystemInfo.Exists.get()' is abstract in the implementation but is not abstract in the contract.
 CannotMakeMemberAbstract : Member 'System.IO.FileSystemInfo.Name.get()' is abstract in the implementation but is not abstract in the contract.
-TypesMustExist : Type 'System.IO.Enumeration.FileSystemEntry.<_fileNameBuffer>e__FixedBuffer' does not exist in the implementation but it does exist in the contract.
-MembersMustExist : Member 'System.IO.Enumeration.FileSystemEnumerator<TResult>.GetData()' does not exist in the implementation but it does exist in the contract.
+# C# generates backing fields for fixed buffers as public.
+TypesMustExist : Type 'System.IO.Enumeration.FileSystemEntry.<_fileNameBuffer>e__FixedBuffer' does not exist in the implementation but it does exist in the contract.

src/System.IO.FileSystem/src/System/IO/Enumeration/FileSystemEnumerator.Win32.cs

@@ -11,7 +11,7 @@ public partial class FileSystemEnumerator<TResult>
     {
         /// <returns>'true' if new data was found</returns>
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public unsafe bool GetData()
+        private unsafe bool GetData()
         {
             Debug.Assert(_directoryHandle != (IntPtr)(-1) && _directoryHandle != IntPtr.Zero && !_lastEntryFound);
 

src/System.IO.FileSystem/src/System/IO/Enumeration/FileSystemEnumerator.WinRT.cs

@@ -10,7 +10,7 @@ namespace System.IO.Enumeration
     public partial class FileSystemEnumerator<TResult>
     {
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public unsafe bool GetData()
+        private unsafe bool GetData()
         {
             if (!Interop.Kernel32.GetFileInformationByHandleEx(
                 _directoryHandle,

src/System.IO.IsolatedStorage/src/MatchingRefApiCompatBaseline.txt

@@ -108,7 +108,7 @@ internal set
 
         public IsolatedStorageScope Scope
         {
-            get; protected set;
+            get; private set;
         }
 
         protected virtual char SeparatorExternal
@@ -128,7 +128,7 @@ public virtual bool IncreaseQuotaTo(long newQuotaSize)
 
         public abstract void Remove();
 
-        protected string IdentityHash
+        internal string IdentityHash
         {
             get; private set;
         }