added IFileSystemWatcher

Author: Jens Weiermann

System.IO.Abstractions.TestingHelpers.Tests/MockFileSystemTests.cs

@@ -352,8 +352,8 @@ public void MockFileSystem_FileSystemWatcher_ShouldBeAssignable()
 
         private class TestFileSystemWatcherFactory : IFileSystemWatcherFactory
         {
-            public FileSystemWatcherBase CreateNew() => new TestFileSystemWatcher(null);
-            public FileSystemWatcherBase FromPath(string path) => new TestFileSystemWatcher(path);
+            public IFileSystemWatcher CreateNew() => new TestFileSystemWatcher(null);
+            public IFileSystemWatcher FromPath(string path) => new TestFileSystemWatcher(path);
         }
 
         private class TestFileSystemWatcher : FileSystemWatcherBase

System.IO.Abstractions.TestingHelpers/MockFileSystemWatcherFactory.cs

@@ -3,10 +3,10 @@
     [Serializable]
     public class MockFileSystemWatcherFactory : IFileSystemWatcherFactory
     {
-        public FileSystemWatcherBase CreateNew() =>
+        public IFileSystemWatcher CreateNew() =>
             throw new NotImplementedException(StringResources.Manager.GetString("FILE_SYSTEM_WATCHER_NOT_IMPLEMENTED_EXCEPTION"));
 
-        public FileSystemWatcherBase FromPath(string path) =>
+        public IFileSystemWatcher FromPath(string path) =>
             throw new NotImplementedException(StringResources.Manager.GetString("FILE_SYSTEM_WATCHER_NOT_IMPLEMENTED_EXCEPTION"));
     }
 }

System.IO.Abstractions/FileSystemWatcherBase.cs

@@ -4,7 +4,7 @@ namespace System.IO.Abstractions
 {
     /// <inheritdoc cref="FileSystemWatcher"/>
     [Serializable]
-    public abstract class FileSystemWatcherBase : IDisposable
+    public abstract class FileSystemWatcherBase : IDisposable, IFileSystemWatcher
     {
         /// <inheritdoc cref="FileSystemWatcher.IncludeSubdirectories"/>
         public abstract bool IncludeSubdirectories { get; set; }

System.IO.Abstractions/FileSystemWatcherFactory.cs

@@ -8,12 +8,12 @@ namespace System.IO.Abstractions
     [Serializable]
     public class FileSystemWatcherFactory : IFileSystemWatcherFactory
     {
-        public FileSystemWatcherBase CreateNew()
+        public IFileSystemWatcher CreateNew()
         {
             return new FileSystemWatcherWrapper();
         }
 
-        public FileSystemWatcherBase FromPath(string path)
+        public IFileSystemWatcher FromPath(string path)
         {
             return new FileSystemWatcherWrapper(path);
         }

System.IO.Abstractions/IFileSystemWatcher.cs

@@ -0,0 +1,21 @@
+namespace System.IO.Abstractions
+{
+    public interface IFileSystemWatcher
+    {
+        bool EnableRaisingEvents { get; set; }
+        string Filter { get; set; }
+        bool IncludeSubdirectories { get; set; }
+        int InternalBufferSize { get; set; }
+        NotifyFilters NotifyFilter { get; set; }
+        string Path { get; set; }
+
+        event FileSystemEventHandler Changed;
+        event FileSystemEventHandler Created;
+        event FileSystemEventHandler Deleted;
+        event ErrorEventHandler Error;
+        event RenamedEventHandler Renamed;
+
+        WaitForChangedResult WaitForChanged(WatcherChangeTypes changeType);
+        WaitForChangedResult WaitForChanged(WatcherChangeTypes changeType, int timeout);
+    }
+}

System.IO.Abstractions/IFileSystemWatcherFactory.cs

@@ -11,13 +11,13 @@ public interface IFileSystemWatcherFactory
         /// Initializes a new instance of the <see cref="FileSystemWatcherBase"/> class, which acts as a wrapper for a FileSystemWatcher
         /// </summary>
         /// <returns></returns>
-        FileSystemWatcherBase CreateNew();
+        IFileSystemWatcher CreateNew();
 
         /// <summary>
         /// Initializes a new instance of the <see cref="FileSystemWatcherBase"/> class, which acts as a wrapper for a FileSystemWatcher
         /// </summary>
         /// <param name="path">Path to generate the FileSystemWatcherBase for</param>
         /// <returns></returns>
-        FileSystemWatcherBase FromPath(string path);
+        IFileSystemWatcher FromPath(string path);
     }
 }