properly dispose of managementObjects

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

@@ -34,17 +34,20 @@ namespace hass_workstation_service.Domain.Sensors
         [SupportedOSPlatform("windows")]
         public override string GetState()
         {
-            ManagementObjectCollection collection = _searcher.Get();
-            List<int> processorLoadPercentages = new List<int>();
-            foreach (ManagementObject mo in collection)
+            using (ManagementObjectCollection collection = _searcher.Get())
             {
-                foreach (PropertyData property in mo.Properties)
+                List<int> processorLoadPercentages = new List<int>();
+                foreach (ManagementObject mo in collection)
                 {
-                    processorLoadPercentages.Add(int.Parse(property.Value.ToString()));
+                    foreach (PropertyData property in mo.Properties)
+                    {
+                        processorLoadPercentages.Add(int.Parse(property.Value.ToString()));
+                    }
                 }
+                double average = processorLoadPercentages.Count > 0 ? processorLoadPercentages.Average() : 0.0;
+                return average.ToString("#.##", CultureInfo.InvariantCulture);
             }
-            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 collection)
+            foreach (MMDevice device in devices)
             {
                 peaks.Add(device.AudioMeterInformation.PeakValues[0]);
             }

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

@@ -17,22 +17,25 @@ namespace hass_workstation_service.Domain.Sensors
         }
         public override string GetState()
         {
-            ManagementObjectCollection collection = _searcher.Get();
-            UInt64? totalMemory = null;
-            UInt64? freeMemory = null;
-            foreach (ManagementObject mo in collection)
+            using (ManagementObjectCollection collection = _searcher.Get())
             {
-                totalMemory = (UInt64)mo.Properties["TotalVisibleMemorySize"]?.Value;
-                freeMemory = (UInt64)mo.Properties["FreePhysicalMemory"]?.Value;
+                UInt64? totalMemory = null;
+                UInt64? freeMemory = null;
+                foreach (ManagementObject mo in collection)
+                {
+                    totalMemory = (UInt64)mo.Properties["TotalVisibleMemorySize"]?.Value;
+                    freeMemory = (UInt64)mo.Properties["FreePhysicalMemory"]?.Value;
+                }
+                if (totalMemory != null && freeMemory != null)
+                {
+                    decimal totalMemoryDec = totalMemory.Value;
+                    decimal freeMemoryDec = freeMemory.Value;
+                    decimal precentageUsed = 100 - (freeMemoryDec / totalMemoryDec) * 100;
+                    return precentageUsed.ToString("#.##", CultureInfo.InvariantCulture);
+                }
+                return "";
             }
-            if (totalMemory != null && freeMemory != null)
-            {
-                decimal totalMemoryDec = totalMemory.Value;
-                decimal freeMemoryDec = freeMemory.Value;
-                decimal precentageUsed = 100 - (freeMemoryDec / totalMemoryDec) * 100;
-                return precentageUsed.ToString("#.##", CultureInfo.InvariantCulture);
-            }
-            return "";
+            
         }
         public override SensorDiscoveryConfigModel GetAutoDiscoveryConfig()
         {

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

@@ -34,16 +34,17 @@ namespace hass_workstation_service.Domain.Sensors
 
         public override string GetState()
         {
-            ManagementObjectCollection collection = _searcher.Get();
-
-            foreach (ManagementObject mo in collection)
+            using (ManagementObjectCollection collection = _searcher.Get())
             {
-                foreach (PropertyData property in mo.Properties)
+                foreach (ManagementObject mo in collection)
                 {
-                    return property.Value.ToString();
+                    foreach (PropertyData property in mo.Properties)
+                    {
+                        return property.Value.ToString();
+                    }
                 }
+                return "";
             }
-            return "";
         }
 
     }