删除DeviceManager和V8类中未使用的字段，消除CS0414警告

Windows/CS/Framework4.0/Toprie/Toprie/V8.cs

@@ -129,8 +129,7 @@ namespace JoyD.Windows.CS.Toprie
 
         // 私有字段
         private string deviceIp;
-        private Socket socket;
-        private bool isConnected = false;
+        private Socket socket = null;
         private static bool isSdkInitialized = false;
         private static Dictionary<string, V8> deviceInstances = new Dictionary<string, V8>();
 
@@ -157,10 +156,9 @@ namespace JoyD.Windows.CS.Toprie
                 if (socket != null)
                 {
                     socket.Close();
-                    socket = null;
-                }
-                isConnected = false;
-                Console.WriteLine("UDP通信状态已重置");
+                socket = null;
+            }
+            Console.WriteLine("UDP通信状态已重置");
             }
             catch (Exception ex)
             {