Default event delegate updaet

Source/Meadow.Foundation.Core/Communications/SerialTextFile.cs

@@ -54,7 +54,7 @@ public class SerialTextFile
         /// <summary>
         /// A complete line of text has been read, send this to the event subscriber.
         /// </summary>
-        public event LineReceived OnLineReceived = delegate { };
+        public event LineReceived OnLineReceived = default!;
 
         #endregion Events and delegates
 

Source/Meadow.Foundation.Core/Relays/Relay.cs

@@ -10,7 +10,7 @@ namespace Meadow.Foundation.Relays
     public class Relay : IRelay
     {
         /// <inheritdoc/>
-        public event EventHandler<bool> OnRelayChanged = delegate { };
+        public event EventHandler<bool> OnRelayChanged = default!;
 
         /// <summary>
         /// Returns digital output port

Source/Meadow.Foundation.Core/SamplingSensorBase.cs

@@ -21,7 +21,7 @@ public abstract class SamplingSensorBase<UNIT> : ObservableBase<UNIT>, ISampling
         /// <summary>
         /// Event handler for updated values
         /// </summary>
-        public event EventHandler<IChangeResult<UNIT>> Updated = delegate { };
+        public event EventHandler<IChangeResult<UNIT>> Updated = default!;
 
         /// <summary>
         /// Sampling cancellation token source

Source/Meadow.Foundation.Core/Sensors/Buttons/PushButtonBase.cs

@@ -18,22 +18,22 @@ public abstract class PushButtonBase : IButton, IDisposable
         /// <summary>
         /// Raised when a press starts
         /// </summary>
-        public event EventHandler PressStarted = delegate { };
+        public event EventHandler PressStarted = default!;
 
         /// <summary>
         /// Raised when a press ends
         /// </summary>
-        public event EventHandler PressEnded = delegate { };
+        public event EventHandler PressEnded = default!;
 
         /// <summary>
         /// Raised when the button is released after a press
         /// </summary>
-        public event EventHandler Clicked = delegate { };
+        public event EventHandler Clicked = default!;
 
         /// <summary>
         /// Raised when the button is pressed for LongClickedThreshold or longer and then releases
         /// </summary>
-        public event EventHandler LongClicked = delegate { };
+        public event EventHandler LongClicked = default!;
 
         /// <summary>
         /// Track if we created the input port in the PushButton instance (true)

Source/Meadow.Foundation.Core/Sensors/HallEffect/DigitalTachometer.cs

@@ -12,7 +12,7 @@ public class LinearHallEffectTachometer
         /// Event raised when the RPM change is greater than the 
         /// RPMChangeNotificationThreshold value.
         /// </summary>
-        public event EventHandler<ChangeResult<float>> RPMsChanged = delegate { };
+        public event EventHandler<ChangeResult<float>> RPMsChanged = default!;
 
         /// <summary>
         /// Any changes to the RPMs that are greater than the RPM change

Source/Meadow.Foundation.Core/Sensors/Hid/DigitalJoystick.cs

@@ -18,7 +18,7 @@ public class DigitalJoystick : IDigitalJoystick
         /// <summary>
         /// Raised when the digital joystick position changes
         /// </summary>
-        public event EventHandler<ChangeResult<DigitalJoystickPosition>> Updated = delegate { };
+        public event EventHandler<ChangeResult<DigitalJoystickPosition>> Updated = default!;
 
         /// <summary>
         /// The PushButton class for the up digital joystick switch

Source/Meadow.Foundation.Core/Sensors/Light/AnalogLightSensor.cs

@@ -20,7 +20,7 @@ public partial class AnalogLightSensor
         /// <summary>
         /// Raised when the value of the reading changes.
         /// </summary>
-        public event EventHandler<IChangeResult<Illuminance>> IlluminanceUpdated = delegate { };
+        public event EventHandler<IChangeResult<Illuminance>> IlluminanceUpdated = default!;
 
         /// <summary>
         /// Illuminance sensor calibration

Source/Meadow.Foundation.Core/Sensors/Rotary/RotaryEncoder.cs

@@ -13,7 +13,7 @@ public class RotaryEncoder : IRotaryEncoder
     /// <summary>
     /// Raised when the rotary encoder is rotated and returns a RotaryTurnedEventArgs object which describes the direction of rotation.
     /// </summary>
-    public event EventHandler<RotaryChangeResult> Rotated = delegate { };
+    public event EventHandler<RotaryChangeResult> Rotated = default!;
 
     /// <summary>
     /// Returns the pin connected to the A-phase output on the rotary encoder.

Source/Meadow.Foundation.Core/Sensors/Rotary/RotaryEncoderWithButton.cs

@@ -24,22 +24,22 @@ public class RotaryEncoderWithButton : RotaryEncoder, IRotaryEncoderWithButton
     /// <summary>
     /// Raised when the button circuit is re-opened after it has been closed
     /// </summary>
-    public event EventHandler Clicked = delegate { };
+    public event EventHandler Clicked = default!;
 
     /// <summary>
     /// Raised when a press ends
     /// </summary>
-    public event EventHandler PressEnded = delegate { };
+    public event EventHandler PressEnded = default!;
 
     /// <summary>
     /// Raised when a press starts
     /// </summary>
-    public event EventHandler PressStarted = delegate { };
+    public event EventHandler PressStarted = default!;
 
     /// <summary>
     /// Raised when the button circuit is pressed for LongPressDuration
     /// </summary>
-    public event EventHandler LongClicked = delegate { };
+    public event EventHandler LongClicked = default!;
 
     /// <summary>
     /// The minimum duration for a long press

Source/Meadow.Foundation.Core/Sensors/Switches/DipSwitch.cs

@@ -25,7 +25,7 @@ public class DipSwitch
         /// <summary>
         /// Raised when one of the switches is switched on or off.
         /// </summary>
-        public event ArrayEventHandler Changed = delegate { };
+        public event ArrayEventHandler Changed = default!;
 
         /// <summary>
         /// Creates a new DipSwitch connected to the specified switchPins, with the InterruptMode and ResisterMode specified by the type parameters.

Source/Meadow.Foundation.Core/Sensors/Switches/SpdtSwitch.cs

@@ -28,7 +28,7 @@ public bool IsOn
         /// <summary>
         /// Raised when the switch circuit is opened or closed.
         /// </summary>
-        public event EventHandler Changed = delegate { };
+        public event EventHandler Changed = default!;
 
         /// <summary>
         /// Instantiates a new SpdtSwitch object with the center pin connected to the specified digital pin, one pin connected to common/ground and one pin connected to high/3.3V.

Source/Meadow.Foundation.Core/Sensors/Switches/SpstSwitch.cs

@@ -26,7 +26,7 @@ public bool IsOn
         /// <summary>
         /// Raised when the switch circuit is opened or closed.
         /// </summary>
-        public event EventHandler Changed = delegate { };
+        public event EventHandler Changed = default!;
 
         /// <summary>
         /// Returns the DigitalInputPort.

Source/Meadow.Foundation.Core/Sensors/Temperature/AnalogTemperature.cs

@@ -35,7 +35,7 @@ public partial class AnalogTemperature : SamplingSensorBase<Units.Temperature>,
         /// <summary>
         /// Raised when the value of the reading changes.
         /// </summary>
-        public event EventHandler<IChangeResult<Units.Temperature>> TemperatureUpdated = delegate { };
+        public event EventHandler<IChangeResult<Units.Temperature>> TemperatureUpdated = default!;
 
         ///<Summary>
         /// AnalogInputPort connected to temperature sensor

Source/Meadow.Foundation.Libraries_and_Frameworks/Displays.TextDisplayMenu/Driver/BaseClasses/NumericBase.cs

@@ -17,7 +17,7 @@ public abstract class NumericBase : InputBase
         /// <summary>
         /// Raised when the numeric value changes
         /// </summary>
-        public override event ValueChangedHandler ValueChanged = delegate { };
+        public override event ValueChangedHandler ValueChanged = default!;
 
         /// <summary>
         /// Create a new NumericBase object

Source/Meadow.Foundation.Libraries_and_Frameworks/Displays.TextDisplayMenu/Driver/BaseClasses/TimeBase.cs

@@ -26,7 +26,7 @@ public abstract class TimeBase : InputBase
         /// Raised if the input value changes
         /// </summary>
 
-        public override event ValueChangedHandler ValueChanged = delegate { };
+        public override event ValueChangedHandler ValueChanged = default!;
 
         /// <summary>
         /// Create a new TimeBase object

Source/Meadow.Foundation.Libraries_and_Frameworks/Displays.TextDisplayMenu/Driver/InputTypes/Date.cs

@@ -13,7 +13,7 @@ public class Date : InputBase
         /// <summary>
         /// Raised when the date value changes
         /// </summary>
-        public override event ValueChangedHandler ValueChanged = delegate { };
+        public override event ValueChangedHandler ValueChanged = default!;
 
         /// <summary>
         /// Create a new Date input object

Source/Meadow.Foundation.Libraries_and_Frameworks/Displays.TextDisplayMenu/Driver/InputTypes/ListBase.cs

@@ -20,7 +20,7 @@ public abstract class ListBase : InputBase
         /// <summary>
         /// The value changed event handler
         /// </summary>
-        public override event ValueChangedHandler ValueChanged = delegate { };
+        public override event ValueChangedHandler ValueChanged = default!;
 
         /// <summary>
         /// The output display text

Source/Meadow.Foundation.Libraries_and_Frameworks/Displays.TextDisplayMenu/Driver/TextDisplayMenu.cs

@@ -26,12 +26,12 @@ public class TextDisplayMenu
         /// <summary>
         /// Raised when the menu receives a selected input
         /// </summary>
-        public event MenuSelectedHandler Selected = delegate { };
+        public event MenuSelectedHandler Selected = default!;
 
         /// <summary>
         /// Raised when a value changes
         /// </summary>
-        public event ValueChangedHandler ValueChanged = delegate { };
+        public event ValueChangedHandler ValueChanged = default!;
 
         /// <summary>
         /// Raised when the user exits the menu

Source/Meadow.Foundation.Libraries_and_Frameworks/Graphics.MicroLayout/Driver/ClickableControl.cs

@@ -10,7 +10,7 @@ public abstract class ClickableControl : ThemedControl, IClickableControl
     /// <summary>
     /// Occurs when the clickable control is clicked.
     /// </summary>
-    public event EventHandler Clicked = delegate { };
+    public event EventHandler Clicked = default!;
 
     private bool _pressed = false;
 

Source/Meadow.Foundation.Libraries_and_Frameworks/Sensors.Location.Gnss.NmeaProcessor/Driver/GgaDecoder.cs

@@ -12,7 +12,7 @@ public class GgaDecoder : INmeaDecoder
         /// <summary>
         /// Position update received event.
         /// </summary>
-        public event EventHandler<GnssPositionInfo> PositionReceived = delegate { };
+        public event EventHandler<GnssPositionInfo> PositionReceived = default!;
 
         /// <summary>
         /// Prefix for the GGA decoder.

Source/Meadow.Foundation.Libraries_and_Frameworks/Sensors.Location.Gnss.NmeaProcessor/Driver/GllDecoder.cs

@@ -12,7 +12,7 @@ public class GllDecoder : INmeaDecoder
         /// <summary>
         /// Event raised when valid GLL data is received.
         /// </summary>
-        public event EventHandler<GnssPositionInfo> GeographicLatitudeLongitudeReceived = delegate { };
+        public event EventHandler<GnssPositionInfo> GeographicLatitudeLongitudeReceived = default!;
 
         /// <summary>
         /// Prefix for the GLL (Geographic position Latitude / Longitude) decoder.

Source/Meadow.Foundation.Libraries_and_Frameworks/Sensors.Location.Gnss.NmeaProcessor/Driver/GsaDecoder.cs

@@ -11,7 +11,7 @@ public class GsaDecoder : INmeaDecoder
         /// <summary>
         /// Event raised when valid GSA data is received
         /// </summary>
-        public event EventHandler<ActiveSatellites> ActiveSatellitesReceived = delegate { };
+        public event EventHandler<ActiveSatellites> ActiveSatellitesReceived = default!;
 
         /// <summary>
         /// Prefix for the GSA decoder

Source/Meadow.Foundation.Libraries_and_Frameworks/Sensors.Location.Gnss.NmeaProcessor/Driver/GsvDecoder.cs

@@ -18,7 +18,7 @@ public class GsvDecoder : INmeaDecoder
         /// <summary>
         /// Event raised when valid GSV data is received.
         /// </summary>
-        public event EventHandler<SatellitesInView> SatellitesInViewReceived = delegate { };
+        public event EventHandler<SatellitesInView> SatellitesInViewReceived = default!;
 
         /// <summary>
         /// Current sentence being processed, 0 indicates nothing being processed.

Source/Meadow.Foundation.Libraries_and_Frameworks/Sensors.Location.Gnss.NmeaProcessor/Driver/RmcDeocder.cs

@@ -12,7 +12,7 @@ public class RmcDecoder : INmeaDecoder
         /// <summary>
         /// Position update received event.
         /// </summary>
-        public event EventHandler<GnssPositionInfo> PositionCourseAndTimeReceived = delegate { };
+        public event EventHandler<GnssPositionInfo> PositionCourseAndTimeReceived = default!;
 
         /// <summary>
         /// Prefix for the RMBC decoder.

Source/Meadow.Foundation.Libraries_and_Frameworks/Sensors.Location.Gnss.NmeaProcessor/Driver/VtgDecoder.cs

@@ -11,7 +11,7 @@ public class VtgDecoder : INmeaDecoder
         /// <summary>
         /// Event to be raised when a course and velocity message is received and decoded.
         /// </summary>
-        public event EventHandler<CourseOverGround> CourseAndVelocityReceived = delegate { };
+        public event EventHandler<CourseOverGround> CourseAndVelocityReceived = default!;
 
         /// <summary>
         /// Prefix for the VTG decoder.

Source/Meadow.Foundation.Peripherals/Displays.Gtk/Driver/Gtk.cs

@@ -15,15 +15,15 @@ public class GtkDisplay : IGraphicsDisplay, ITouchScreen
     /// <summary>
     /// Event fired when the display gets a mouse down
     /// </summary>
-    public event Hardware.TouchEventHandler TouchDown = delegate { };
+    public event Hardware.TouchEventHandler TouchDown = default!;
     /// <summary>
     /// Event fired when the display gets a mouse up
     /// </summary>
-    public event Hardware.TouchEventHandler TouchUp = delegate { };
+    public event Hardware.TouchEventHandler TouchUp = default!;
     /// <summary>
     /// Event fired when the display gets a mouse click
     /// </summary>
-    public event Hardware.TouchEventHandler TouchClick = delegate { };
+    public event Hardware.TouchEventHandler TouchClick = default!;
 
     private Window _window = default!;
     private IPixelBuffer _pixelBuffer = default!;

Source/Meadow.Foundation.Peripherals/Displays.WinForms/Driver/WinForms.cs

@@ -12,15 +12,15 @@ public class WinFormsDisplay : Form, IGraphicsDisplay, ITouchScreen
     /// <summary>
     /// Event fired when the display gets a mouse down
     /// </summary>
-    public event TouchEventHandler TouchDown = delegate { };
+    public event TouchEventHandler TouchDown = default!;
     /// <summary>
     /// Event fired when the display gets a mouse up
     /// </summary>
-    public event TouchEventHandler TouchUp = delegate { };
+    public event TouchEventHandler TouchUp = default!;
     /// <summary>
     /// Event fired when the display gets a mouse click
     /// </summary>
-    public event TouchEventHandler TouchClick = delegate { };
+    public event TouchEventHandler TouchClick = default!;
 
     private readonly WinFormsPixelBuffer _buffer;
 

Source/Meadow.Foundation.Peripherals/ICs.FanControllers.Emc2101/Driver/Emc2101.cs

@@ -16,17 +16,17 @@ public partial class Emc2101 :
         /// <summary>
         /// Internal Temperature changed event
         /// </summary>
-        public event EventHandler<IChangeResult<Temperature>> InternalTemperatureUpdated = delegate { };
+        public event EventHandler<IChangeResult<Temperature>> InternalTemperatureUpdated = default!;
 
         /// <summary>
         /// External Temperature changed event
         /// </summary>
-        public event EventHandler<IChangeResult<Temperature>> ExternalTemperatureUpdated = delegate { };
+        public event EventHandler<IChangeResult<Temperature>> ExternalTemperatureUpdated = default!;
 
         /// <summary>
         /// Fan Speed changed event
         /// </summary>
-        public event EventHandler<IChangeResult<AngularVelocity>> FanSpeedUpdated = delegate { };
+        public event EventHandler<IChangeResult<AngularVelocity>> FanSpeedUpdated = default!;
 
         /// <summary>
         /// The temperature as read by the external sensor

Source/Meadow.Foundation.Peripherals/ICs.IOExpanders.As1115/Driver/As1115.cs

@@ -16,12 +16,12 @@ public partial class As1115 : IGraphicsDisplay, II2cPeripheral, IDisposable
         /// <summary>
         /// Event raised when any key scan button is pressed
         /// </summary>
-        public event EventHandler<KeyScanEventArgs> KeyScanPressStarted = delegate { };
+        public event EventHandler<KeyScanEventArgs> KeyScanPressStarted = default!;
 
         /// <summary>
         /// Event raised when any key scan button is released
         /// </summary>
-        public event EventHandler<KeyScanEventArgs> KeyScanPressEnded = delegate { };
+        public event EventHandler<KeyScanEventArgs> KeyScanPressEnded = default!;
 
         /// <summary>
         /// Readonly collection that contains all 16 key scan button objects

Source/Meadow.Foundation.Peripherals/ICs.IOExpanders.As1115/Driver/KeyScanButton.cs

@@ -22,22 +22,22 @@ public class KeyScanButton : IButton
         /// <summary>
         /// Raised when a press starts (the button is pushed down)
         /// </summary>
-        public event EventHandler PressStarted = delegate { };
+        public event EventHandler PressStarted = default!;
 
         /// <summary>
         /// Raised when a press ends (the button is released)
         /// </summary>
-        public event EventHandler PressEnded = delegate { };
+        public event EventHandler PressEnded = default!;
 
         /// <summary>
         /// Raised when the button circuit is re-opened after it has been closed (at the end of a press)
         /// </summary>
-        public event EventHandler Clicked = delegate { };
+        public event EventHandler Clicked = default!;
 
         /// <summary>
         /// Raised when the button circuit is pressed for LongPressDuration
         /// </summary>
-        public event EventHandler LongClicked = delegate { };
+        public event EventHandler LongClicked = default!;
 
         /// <summary>
         /// Maximum DateTime value when the button was just pushed

Source/Meadow.Foundation.Peripherals/ICs.IOExpanders.Mcp23xxx/Driver/Mcp23xxx.DigitalOutputPort.cs

@@ -19,7 +19,7 @@ public class DigitalOutputPort : DigitalOutputPortBase
             /// <summary>
             /// The SetPinState delegate 
             /// </summary>
-            public SetPinStateDelegate SetPinState = delegate { };
+            public SetPinStateDelegate SetPinState = default!;
 
             /// <summary>
             /// The port state

Source/Meadow.Foundation.Peripherals/ICs.IOExpanders.Pca9671/Driver/Pca9671.DigitalInputPort.cs

@@ -13,7 +13,7 @@ public class DigitalInputPort : DigitalInputPortBase
         {
             private ResistorMode _resistorMode = ResistorMode.Disabled;
 
-            internal event EventHandler Disposed = delegate { };
+            internal event EventHandler Disposed = default!;
 
             /// <summary>
             /// The port's containing Pca9671

Source/Meadow.Foundation.Peripherals/ICs.IOExpanders.Pca9671/Driver/Pca9671.DigitalOutputPort.cs

@@ -10,7 +10,7 @@ public partial class Pca9671
         /// </summary>
         public class DigitalOutputPort : DigitalOutputPortBase
         {
-            internal event EventHandler Disposed = delegate { };
+            internal event EventHandler Disposed = default!;
 
             /// <summary>
             /// The port's containing Pca9671