diff --git a/Windows/CS/Framework4.0/Toprie/Toprie/DeviceManager.cs b/Windows/CS/Framework4.0/Toprie/Toprie/DeviceManager.cs
index e02bcb4..00b1af8 100644
--- a/Windows/CS/Framework4.0/Toprie/Toprie/DeviceManager.cs
+++ b/Windows/CS/Framework4.0/Toprie/Toprie/DeviceManager.cs
@@ -185,7 +185,7 @@ namespace JoyD.Windows.CS.Toprie
         // 当前视频模式
         private VideoMode _currentVideoMode = VideoMode.Infrared; // 默认红外模式
         // 自动重连是否启用
-        private bool _autoReconnectEnabled = true;
+        private readonly bool _autoReconnectEnabled = true;
         // 自动重连定时器
         private System.Threading.Timer _reconnectTimer;
         // 重连间隔（毫秒）
@@ -228,7 +228,7 @@ namespace JoyD.Windows.CS.Toprie
         // 是否已连接
         private bool _isConnected = false;
         // 连接超时设置
-        private int _connectTimeout = 5000;
+        private readonly int _connectTimeout = 5000;
         // 当前重连尝试次数
         private int _currentReconnectAttempt = 0;
         // 连接取消令牌源