Merge pull request #231 from alex-dubchak/main

fix: re-implement sslStream initialization for framework versions < 5.0

Author: cnblogs-dudu

src/Enyim.Caching/Memcached/PooledSocket.cs

@@ -118,19 +118,21 @@ void Cancel()
 
             if (success)
             {
-#if NET5_0_OR_GREATER
                 if (_useSslStream)
                 {
                     _sslStream = new SslStream(new NetworkStream(_socket));
-                    _sslStream.AuthenticateAsClient(_sslClientAuthOptions);
+                    _sslStream.AuthenticateAsClient(
+#if NET5_0_OR_GREATER
+                        _sslClientAuthOptions
+#else
+                        ((DnsEndPoint)_endpoint).Host
+#endif
+                        );
                 }
                 else
                 {
                     _inputStream = new NetworkStream(_socket);
                 }
-#else
-                _inputStream = new NetworkStream(_socket);
-#endif
             }
             else
             {
@@ -182,19 +184,21 @@ public async Task ConnectAsync()
 
             if (success)
             {
-#if NET5_0_OR_GREATER
                 if (_useSslStream)
                 {
                     _sslStream = new SslStream(new NetworkStream(_socket));
-                    await _sslStream.AuthenticateAsClientAsync(_sslClientAuthOptions);
+                    await _sslStream.AuthenticateAsClientAsync(
+#if NET5_0_OR_GREATER
+                        _sslClientAuthOptions
+#else
+                        ((DnsEndPoint)_endpoint).Host
+#endif
+                        );
                 }
                 else
                 {
                     _inputStream = new NetworkStream(_socket);
                 }
-#else
-                _inputStream = new NetworkStream(_socket);
-#endif
             }
             else
             {