diff --git a/Windows/CS/Framework4.0/Toprie/Toprie/DeviceManager.cs b/Windows/CS/Framework4.0/Toprie/Toprie/DeviceManager.cs
index 14fb337..830af27 100644
--- a/Windows/CS/Framework4.0/Toprie/Toprie/DeviceManager.cs
+++ b/Windows/CS/Framework4.0/Toprie/Toprie/DeviceManager.cs
@@ -180,9 +180,9 @@ namespace JoyD.Windows.CS.Toprie
         // 是否已初始化
         private bool _isInitialized = false;
         // 是否已释放
-        private bool _isDisposed = false;
+        private readonly bool _isDisposed = false;
         // 图像模式
-        private readonly ImageMode _currentImageMode = ImageMode.Infrared;
+        private ImageMode _currentImageMode = ImageMode.Infrared;
         // 当前色彩模式
         private PaletteType _currentPaletteType = PaletteType.WhiteHot;
         // 当前视频模式