random code cleanup

src/BizHawk.Client.EmuHawk/MainForm.VSystem.cs

@@ -885,10 +885,6 @@ namespace BizHawk.Client.EmuHawk
 				snes9X.PutSettings(s);
 				AddOnScreenMessage($"Sprite {layer} Layer {(result ? "On" : "Off")}");
 			}
-			else
-			{
-				return;
-			}
 		}
 
 

src/BizHawk.Client.EmuHawk/MainForm.cs

@@ -4650,7 +4650,7 @@ namespace BizHawk.Client.EmuHawk
 					if (_singleInstanceServer.IsMessageComplete) break;
 				}
 
-				var payloadString = System.Text.Encoding.ASCII.GetString(payloadBytes.GetBuffer(), 0, (int)payloadBytes.Length);
+				var payloadString = Encoding.ASCII.GetString(payloadBytes.GetBuffer(), 0, (int)payloadBytes.Length);
 				var args = payloadString.Split('|').Select(a => Encoding.UTF8.GetString(a.HexStringToBytes())).ToArray();
 
 				Console.WriteLine("RECEIVED SINGLE INSTANCE FORWARDED ARGS:");

src/BizHawk.Client.EmuHawk/tools/SNES/SNESGraphicsDebugger.cs

@@ -1242,7 +1242,7 @@ namespace BizHawk.Client.EmuHawk
 				// find the control under the mouse
 				Point m = Cursor.Position;
 				Control top = this;
-				Control found = null;
+				Control found;
 				do
 				{
 					found = top.GetChildAtPoint(top.PointToClient(m), GetChildAtPointSkip.Invisible);

src/BizHawk.Client.EmuHawk/tools/TAStudio/PatternsForm.cs

@@ -110,7 +110,7 @@ namespace BizHawk.Client.EmuHawk
 				return;
 			}
 
-			_values[PatternList.SelectedIndex] = unchecked((int) ValueNum.Value).ToString(NumberFormatInfo.InvariantInfo);
+			_values[PatternList.SelectedIndex] = ((int) ValueNum.Value).ToString(NumberFormatInfo.InvariantInfo);
 			UpdatePattern();
 			UpdateDisplay();
 		}

src/BizHawk.Emulation.Common/Base Implementations/Axes/AxisSpec.cs

@@ -2,7 +2,7 @@ using BizHawk.Common;
 
 namespace BizHawk.Emulation.Common
 {
-	public readonly struct AxisSpec
+	public readonly record struct AxisSpec
 	{
 		/// <summary>
 		/// Gets the axis constraints that apply artificial constraints to float values

src/BizHawk.Emulation.Common/Base Implementations/CallbackBasedTraceBuffer.cs

@@ -85,6 +85,5 @@ namespace BizHawk.Emulation.Common
 
 			public string Scope { get; }
 		}
-#nullable restore
 	}
 }

src/BizHawk.Emulation.Common/Base Implementations/MemoryDomain.cs

@@ -34,71 +34,59 @@ namespace BizHawk.Emulation.Common
 
 		public virtual ushort PeekUshort(long addr, bool bigEndian)
 		{
-			Endian endian = bigEndian ? Endian.Big : Endian.Little;
-			switch (endian)
+			if (bigEndian)
 			{
-				default:
-				case Endian.Big:
 				return (ushort)((PeekByte(addr) << 8) | PeekByte(addr + 1));
-				case Endian.Little:
-					return (ushort)(PeekByte(addr) | (PeekByte(addr + 1) << 8));
 			}
+
+			return (ushort)(PeekByte(addr) | (PeekByte(addr + 1) << 8));
 		}
 
 		public virtual uint PeekUint(long addr, bool bigEndian)
 		{
-			Endian endian = bigEndian ? Endian.Big : Endian.Little;
-			switch (endian)
+			if (bigEndian)
 			{
-				default:
-				case Endian.Big:
 				return (uint)((PeekByte(addr) << 24)
 					| (PeekByte(addr + 1) << 16)
 					| (PeekByte(addr + 2) << 8)
 					| (PeekByte(addr + 3) << 0));
-				case Endian.Little:
+			}
+
 			return (uint)((PeekByte(addr) << 0)
 				| (PeekByte(addr + 1) << 8)
 				| (PeekByte(addr + 2) << 16)
 				| (PeekByte(addr + 3) << 24));
 		}
-		}
 
 		public virtual void PokeUshort(long addr, ushort val, bool bigEndian)
 		{
-			Endian endian = bigEndian ? Endian.Big : Endian.Little;
-			switch (endian)
+			if (bigEndian)
 			{
-				default:
-				case Endian.Big:
 				PokeByte(addr + 0, (byte)(val >> 8));
 				PokeByte(addr + 1, (byte)val);
-					break;
-				case Endian.Little:
+			}
+			else
+			{
 				PokeByte(addr + 0, (byte)val);
 				PokeByte(addr + 1, (byte)(val >> 8));
-					break;
 			}
 		}
 
 		public virtual void PokeUint(long addr, uint val, bool bigEndian)
 		{
-			Endian endian = bigEndian ? Endian.Big : Endian.Little;
-			switch (endian)
+			if (bigEndian)
 			{
-				default:
-				case Endian.Big:
 				PokeByte(addr + 0, (byte)(val >> 24));
 				PokeByte(addr + 1, (byte)(val >> 16));
 				PokeByte(addr + 2, (byte)(val >> 8));
 				PokeByte(addr + 3, (byte)val);
-					break;
-				case Endian.Little:
+			}
+			else
+			{
 				PokeByte(addr + 0, (byte)val);
 				PokeByte(addr + 1, (byte)(val >> 8));
 				PokeByte(addr + 2, (byte)(val >> 16));
 				PokeByte(addr + 3, (byte)(val >> 24));
-					break;
 			}
 		}
 
@@ -107,7 +95,7 @@ namespace BizHawk.Emulation.Common
 			if (addresses is null) throw new ArgumentNullException(paramName: nameof(addresses));
 			if (values is null) throw new ArgumentNullException(paramName: nameof(values));
 
-			if ((long) addresses.Count() != values.Length)
+			if ((long)addresses.Count() != values.Length)
 			{
 				throw new InvalidOperationException("Invalid length of values array");
 			}

src/BizHawk.Emulation.Common/Database/FirmwareID.cs

@@ -27,7 +27,7 @@ namespace BizHawk.Emulation.Common
 			Firmware = firmware;
 		}
 
-		public override bool Equals(object obj) => obj is FirmwareID other
+		public override bool Equals(object? obj) => obj is FirmwareID other
 			&& other.Firmware == Firmware && other.System == System;
 
 		public override int GetHashCode() => (System, Firmware).GetHashCode();