TcpListener should implement IDisposable

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) { }
@@ -726,6 +726,7 @@ public void AllowNatTraversal(bool allowed) { }
         public void Start() { }
         public void Start(int backlog) { }
         public void Stop() { }
+        public void Dispose() { }
     }
     [System.FlagsAttribute]
     public enum TransmitFileOptions

src/libraries/System.Net.Sockets/src/System.Net.Sockets.csproj

@@ -39,8 +39,8 @@
     <Compile Include="System\Net\Sockets\SocketOptionLevel.cs" />
     <Compile Include="System\Net\Sockets\SocketOptionName.cs" />
     <Compile Include="System\Net\Sockets\SocketShutdown.cs" />
-    <Compile Include="System\Net\Sockets\TCPClient.cs" />
-    <Compile Include="System\Net\Sockets\TCPListener.cs" />
+    <Compile Include="System\Net\Sockets\TcpClient.cs" />
+    <Compile Include="System\Net\Sockets\TcpListener.cs" />
     <Compile Include="System\Net\Sockets\TransmitFileOptions.cs" />
     <Compile Include="System\Net\Sockets\UDPClient.cs" />
     <Compile Include="System\Net\Sockets\UdpReceiveResult.cs" />

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

@@ -5,13 +5,14 @@
 using System.Threading.Tasks;
 using System.Runtime.Versioning;
 using System.Diagnostics;
+using System.ComponentModel;
 
 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;
@@ -159,14 +160,22 @@ public void Start(int backlog)
             _active = true;
         }
 
-        // Closes the network connection.
+        /// <summary>
+        /// Closes the network connection.
+        /// </summary>
         public void Stop()
         {
             _serverSocket?.Dispose();
             _active = false;
             _serverSocket = null;
         }
 
+        /// <summary>
+        /// Closes the network connection.
+        /// </summary>
+        [EditorBrowsable(EditorBrowsableState.Never)]
+        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 +43,28 @@ 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 = new DerivedTcpListener(IPAddress.Loopback, 0);
+            using ((IDisposable)listener)
+            {
+                Assert.False(listener.Active);
+                listener.Start();
+                Assert.True(listener.Active);
+            }
+            Assert.False(listener.Active);
+        }
+
         [Fact]
         [PlatformSpecific(TestPlatforms.Windows)]
         public void AllowNatTraversal_NotStarted_SetSuccessfully()