Use Null-Propagation Operator

OpenRA.Game/Network/Connection.cs

@@ -174,23 +174,21 @@ namespace OpenRA.Network
 			foreach (var p in packets)
 			{
 				packetFn(p.FromClient, p.Data);
-				if (Recorder != null)
-					Recorder.Receive(p.FromClient, p.Data);
+				Recorder?.Receive(p.FromClient, p.Data);
 			}
 		}
 
 		public void StartRecording(Func<string> chooseFilename)
 		{
 			// If we have a previous recording then save/dispose it and start a new one.
-			if (Recorder != null)
-				Recorder.Dispose();
+			Recorder?.Dispose();
 			Recorder = new ReplayRecorder(chooseFilename);
 		}
 
 		protected virtual void Dispose(bool disposing)
 		{
-			if (disposing && Recorder != null)
-				Recorder.Dispose();
+			if (disposing)
+				Recorder?.Dispose();
 		}
 
 		public void Dispose()
@@ -372,8 +370,7 @@ namespace OpenRA.Network
 
 			// Closing the stream will cause any reads on the receiving thread to throw.
 			// This will mark the connection as no longer connected and the thread will terminate cleanly.
-			if (tcp != null)
-				tcp.Close();
+			tcp?.Close();
 
 			base.Dispose(disposing);
 		}

OpenRA.Game/Network/OrderManager.cs

@@ -206,8 +206,7 @@ namespace OpenRA.Network
 		public void Dispose()
 		{
 			disposed = true;
-			if (Connection != null)
-				Connection.Dispose();
+			Connection?.Dispose();
 		}
 	}
 

OpenRA.Game/Network/ReplayRecorder.cs

@@ -100,8 +100,7 @@ namespace OpenRA.Network
 				Metadata.Write(writer);
 			}
 
-			if (preStartBuffer != null)
-				preStartBuffer.Dispose();
+			preStartBuffer?.Dispose();
 			writer.Close();
 		}
 	}

OpenRA.Game/Network/UnitOrders.cs

@@ -145,8 +145,7 @@ namespace OpenRA.Network
 						var data = MiniYaml.FromString(order.TargetString)[0];
 						var traitIndex = int.Parse(data.Key);
 
-						if (world != null)
-							world.AddGameSaveTraitData(traitIndex, data.Value);
+						world?.AddGameSaveTraitData(traitIndex, data.Value);
 
 						break;
 					}