remove dead code from nativemethods

src/Framework/NativeMethods.cs

@@ -1821,53 +1821,4 @@ internal static extern bool GetFileTime(
     internal static extern int symlink(string oldpath, string newpath);
 
     #endregion
-
-    #region helper methods
-
-    internal static bool DirectoryExists(string fullPath)
-    {
-        return IsWindows
-            ? DirectoryExistsWindows(fullPath)
-            : Directory.Exists(fullPath);
-    }
-
-    [SupportedOSPlatform("windows")]
-    internal static bool DirectoryExistsWindows(string fullPath)
-    {
-        WIN32_FILE_ATTRIBUTE_DATA data = new WIN32_FILE_ATTRIBUTE_DATA();
-        bool success = GetFileAttributesEx(fullPath, 0, ref data);
-        return success && (data.fileAttributes & FILE_ATTRIBUTE_DIRECTORY) != 0;
-    }
-
-    internal static bool FileExists(string fullPath)
-    {
-        return IsWindows
-            ? FileExistsWindows(fullPath)
-            : File.Exists(fullPath);
-    }
-
-    [SupportedOSPlatform("windows")]
-    internal static bool FileExistsWindows(string fullPath)
-    {
-        WIN32_FILE_ATTRIBUTE_DATA data = new WIN32_FILE_ATTRIBUTE_DATA();
-        bool success = GetFileAttributesEx(fullPath, 0, ref data);
-        return success && (data.fileAttributes & FILE_ATTRIBUTE_DIRECTORY) == 0;
-    }
-
-    internal static bool FileOrDirectoryExists(string path)
-    {
-        return IsWindows
-            ? FileOrDirectoryExistsWindows(path)
-            : File.Exists(path) || Directory.Exists(path);
-    }
-
-    [SupportedOSPlatform("windows")]
-    internal static bool FileOrDirectoryExistsWindows(string path)
-    {
-        WIN32_FILE_ATTRIBUTE_DATA data = new WIN32_FILE_ATTRIBUTE_DATA();
-        return GetFileAttributesEx(path, 0, ref data);
-    }
-
-    #endregion
-
 }

src/MSBuildTaskHost/FileSystem/MSBuildTaskHostFileSystem.cs

@@ -20,7 +20,7 @@ internal class MSBuildTaskHostFileSystem : IFileSystem
 
         public bool FileOrDirectoryExists(string path)
         {
-            return NativeMethodsShared.FileOrDirectoryExists(path);
+            return FileExists(path) || DirectoryExists(path);
         }
 
         public FileAttributes GetAttributes(string path)
@@ -35,7 +35,7 @@ public DateTime GetLastWriteTimeUtc(string path)
 
         public bool DirectoryExists(string path)
         {
-            return NativeMethodsShared.DirectoryExists(path);
+            return Directory.Exists(path);
         }
 
         public IEnumerable<string> EnumerateDirectories(string path, string searchPattern = "*", SearchOption searchOption = SearchOption.TopDirectoryOnly)
@@ -77,7 +77,7 @@ public IEnumerable<string> EnumerateFileSystemEntries(string path, string search
 
         public bool FileExists(string path)
         {
-            return NativeMethodsShared.FileExists(path);
+            return File.Exists(path);
         }
     }
 }

src/Shared/FileSystem/WindowsFileSystem.cs

@@ -55,7 +55,11 @@ public override IEnumerable<string> EnumerateFileSystemEntries(string path, stri
 
         public override bool DirectoryExists(string path)
         {
-            return NativeMethodsShared.DirectoryExistsWindows(path);
+#if NETFRAMEWORK
+            return Microsoft.IO.Directory.Exists(path);
+#else
+            return Directory.Exists(path);
+#endif
         }
 
         public override bool FileExists(string path)
@@ -69,7 +73,11 @@ public override bool FileExists(string path)
 
         public override bool FileOrDirectoryExists(string path)
         {
-            return NativeMethodsShared.FileOrDirectoryExistsWindows(path);
+#if NETFRAMEWORK
+            return FileExists(path) || DirectoryExists(path);
+#else
+            return Path.Exists(path);
+#endif
         }
 
         public override DateTime GetLastWriteTimeUtc(string path)