properly dispose of managementObjects

hass-workstation-service/Domain/Sensors/CPULoadSensor.cs

@@ -34,7 +34,8 @@ namespace hass_workstation_service.Domain.Sensors
         [SupportedOSPlatform("windows")]
         public override string GetState()
         {
-            ManagementObjectCollection collection = _searcher.Get();
+            using (ManagementObjectCollection collection = _searcher.Get())
+            {
                 List<int> processorLoadPercentages = new List<int>();
                 foreach (ManagementObject mo in collection)
                 {
@@ -46,5 +47,7 @@ namespace hass_workstation_service.Domain.Sensors
                 double average = processorLoadPercentages.Count > 0 ? processorLoadPercentages.Average() : 0.0;
                 return average.ToString("#.##", CultureInfo.InvariantCulture);
             }
+
+        }
     }
 }

hass-workstation-service/Domain/Sensors/CurrentVolumeSensor.cs

@@ -12,9 +12,11 @@ namespace hass_workstation_service.Domain.Sensors
 {
     public class CurrentVolumeSensor : AbstractSensor
     {
-        private MMDeviceEnumerator DevEnum;
+        private MMDeviceEnumerator deviceEnumerator;
+        private MMDeviceCollection devices;
         public CurrentVolumeSensor(MqttPublisher publisher, int? updateInterval = null, string name = "CurrentVolume", Guid id = default(Guid)) : base(publisher, name ?? "CurrentVolume", updateInterval ?? 10, id) {
-            this.DevEnum = new MMDeviceEnumerator();
+            this.deviceEnumerator = new MMDeviceEnumerator();
+            this.devices = deviceEnumerator.EnumerateAudioEndPoints(EDataFlow.eRender, DEVICE_STATE.DEVICE_STATE_ACTIVE);
         }
         public override SensorDiscoveryConfigModel GetAutoDiscoveryConfig()
         {
@@ -30,17 +32,11 @@ namespace hass_workstation_service.Domain.Sensors
             });
         }
 
-        [DllImport("winmm.dll")]
-        public static extern int waveOutGetVolume(IntPtr hwo, out uint dwVolume);
-
         public override string GetState()
         {
-            var collection = DevEnum.EnumerateAudioEndPoints(EDataFlow.eRender, DEVICE_STATE.DEVICE_STATE_ACTIVE);
-
             List<float> peaks = new List<float>();
 
-
+            foreach (MMDevice device in devices)
-            foreach (MMDevice device in collection)
             {
                 peaks.Add(device.AudioMeterInformation.PeakValues[0]);
             }

hass-workstation-service/Domain/Sensors/MemoryUsageSensor.cs

@@ -17,7 +17,8 @@ namespace hass_workstation_service.Domain.Sensors
         }
         public override string GetState()
         {
-            ManagementObjectCollection collection = _searcher.Get();
+            using (ManagementObjectCollection collection = _searcher.Get())
+            {
                 UInt64? totalMemory = null;
                 UInt64? freeMemory = null;
                 foreach (ManagementObject mo in collection)
@@ -34,6 +35,8 @@ namespace hass_workstation_service.Domain.Sensors
                 }
                 return "";
             }
+            
+        }
         public override SensorDiscoveryConfigModel GetAutoDiscoveryConfig()
         {
             return this._autoDiscoveryConfigModel ?? SetAutoDiscoveryConfigModel(new SensorDiscoveryConfigModel()

hass-workstation-service/Domain/Sensors/SessionStateSensor.cs

@@ -92,6 +92,8 @@ namespace hass_workstation_service.Domain.Sensors
                     
                 }
 
+                
+
                 var numberOflogonUIProcesses = Process.GetProcessesByName("LogonUI").Length;
 
                 if (numberOflogonUIProcesses >= numberOfUserDesktops)

hass-workstation-service/Domain/Sensors/WMIQuerySensor.cs

@@ -34,8 +34,8 @@ namespace hass_workstation_service.Domain.Sensors
 
         public override string GetState()
         {
-            ManagementObjectCollection collection = _searcher.Get();
+            using (ManagementObjectCollection collection = _searcher.Get())
-
+            {
                 foreach (ManagementObject mo in collection)
                 {
                     foreach (PropertyData property in mo.Properties)
@@ -45,6 +45,7 @@ namespace hass_workstation_service.Domain.Sensors
                 }
                 return "";
             }
+        }
 
     }
 }