TcpListener should implement IDisposable (#88043)

* TcpListener should implement IDisposable

* lint

* Code review

* Update src/libraries/System.Net.Sockets/src/System/Net/Sockets/TCPListener.cs

Co-authored-by: Anton Firszov <antonfir@gmail.com>

* Update TCPListener.cs [EditorBrowsable(EditorBrowsableState.Never)]

* Code review

* lint

* Code review

---------

Co-authored-by: Anton Firszov <antonfir@gmail.com>

Author: AlexRadch

src/libraries/System.Net.Sockets/ref/System.Net.Sockets.cs

@@ -699,7 +699,7 @@ public void EndConnect(System.IAsyncResult asyncResult) { }
         ~TcpClient() { }
         public System.Net.Sockets.NetworkStream GetStream() { throw null; }
     }
-    public partial class TcpListener
+    public partial class TcpListener : System.IDisposable
     {
         [System.ObsoleteAttribute("This constructor has been deprecated. Use TcpListener(IPAddress localaddr, int port) instead.")]
         public TcpListener(int port) { }
@@ -720,6 +720,7 @@ public void AllowNatTraversal(bool allowed) { }
         public System.IAsyncResult BeginAcceptSocket(System.AsyncCallback? callback, object? state) { throw null; }
         public System.IAsyncResult BeginAcceptTcpClient(System.AsyncCallback? callback, object? state) { throw null; }
         public static System.Net.Sockets.TcpListener Create(int port) { throw null; }
+        public void Dispose() { }
         public System.Net.Sockets.Socket EndAcceptSocket(System.IAsyncResult asyncResult) { throw null; }
         public System.Net.Sockets.TcpClient EndAcceptTcpClient(System.IAsyncResult asyncResult) { throw null; }
         public bool Pending() { throw null; }

src/libraries/System.Net.Sockets/src/System/Net/Sockets/TCPListener.cs

@@ -11,7 +11,7 @@ namespace System.Net.Sockets
     // The System.Net.Sockets.TcpListener class provide TCP services at a higher level of abstraction
     // than the System.Net.Sockets.Socket class. System.Net.Sockets.TcpListener is used to create a
     // host process that listens for connections from TCP clients.
-    public class TcpListener
+    public class TcpListener : IDisposable
     {
         private readonly IPEndPoint _serverSocketEP;
         private Socket? _serverSocket;
@@ -167,6 +167,11 @@ public void Stop()
             _serverSocket = null;
         }
 
+        /// <summary>
+        /// Releases all resources used by the current <see cref="TcpListener"/> instance.
+        /// </summary>
+        public void Dispose() => Stop();
+
         // Determine if there are pending connection requests.
         public bool Pending()
         {

src/libraries/System.Net.Sockets/tests/FunctionalTests/TcpListenerTest.cs

@@ -43,6 +43,21 @@ public void Active_TrueWhileRunning(int ctor)
             Assert.False(listener.Active);
         }
 
+        [Fact]
+        public void IDisposable_DisposeWorksAsStop()
+        {
+            var listener = new DerivedTcpListener(IPAddress.Loopback, 0);
+            using (listener)
+            {
+                Assert.False(listener.Active);
+                listener.Start();
+                Assert.True(listener.Active);
+            }
+            Assert.False(listener.Active);
+            listener.Dispose();
+            Assert.False(listener.Active);
+        }
+
         [Fact]
         [PlatformSpecific(TestPlatforms.Windows)]
         public void AllowNatTraversal_NotStarted_SetSuccessfully()