Fixes more casting and null propogation

Scripts/Mobiles/AI/BaseAI.cs

@@ -250,12 +250,12 @@ namespace Server.Mobiles
 
 			if (!isOwner && !isFriend)
 				return;
-			else if (isFriend && order != OrderType.Follow && order != OrderType.Stay && order != OrderType.Stop)
+			if (isFriend && order != OrderType.Follow && order != OrderType.Stay && order != OrderType.Stop)
 				return;
 
 			if (order == OrderType.Attack)
 			{
-				if (target is BaseCreature && ((BaseCreature)target).IsScaryToPets && m_Mobile.IsScaredOfScaryThings)
+				if (target is BaseCreature creature && creature.IsScaryToPets && m_Mobile.IsScaredOfScaryThings)
 				{
 					m_Mobile.SayTo(from, "Your pet refuses to attack this creature!");
 					return;

Scripts/Mobiles/AI/MageAI.cs

@@ -920,7 +920,7 @@ namespace Server.Mobiles
 
 		public bool CanDispel( Mobile m )
 		{
-			return ( m is BaseCreature && ( (BaseCreature)m ).Summoned && m_Mobile.CanBeHarmful( m, false ) && !( (BaseCreature)m ).IsAnimatedDead );
+			return ( m is BaseCreature creature && creature.Summoned && m_Mobile.CanBeHarmful( creature, false ) && !creature.IsAnimatedDead );
 		}
 
 		private static int[] m_Offsets = new int[]

Scripts/Mobiles/AI/VendorAI.cs

@@ -61,7 +61,7 @@ namespace Server.Mobiles
 				m_Mobile.Say( Utility.RandomList( 1005305, 501603 ) );
 
 				Action = ActionType.Flee;
-				
+
 				return true;
 			}
 
@@ -88,7 +88,7 @@ namespace Server.Mobiles
 
 					m_Mobile.FocusMob = null;
 
-					Action = ActionType.Wander;	
+					Action = ActionType.Wander;
 				}
 			}
 
@@ -109,28 +109,28 @@ namespace Server.Mobiles
 			return base.HandlesOnSpeech( from );
 		}
 
-		// Temporary 
+		// Temporary
 		public override void OnSpeech( SpeechEventArgs e )
 		{
 			base.OnSpeech( e );
- 
+
 			Mobile from = e.Mobile;
- 
-			if ( m_Mobile is BaseVendor && from.InRange( m_Mobile, Core.AOS ? 1 : 4 ) && !e.Handled )
+
+			if ( m_Mobile is BaseVendor vendor && from.InRange( m_Mobile, Core.AOS ? 1 : 4 ) && !e.Handled )
 			{
 				if ( e.HasKeyword( 0x14D ) ) // *vendor sell*
 				{
 					e.Handled = true;
 
-					((BaseVendor)m_Mobile).VendorSell( from );
-					m_Mobile.FocusMob = from;
+					vendor.VendorSell( from );
+					vendor.FocusMob = from;
 				}
 				else if ( e.HasKeyword( 0x3C ) ) // *vendor buy*
 				{
 					e.Handled = true;
 
-					((BaseVendor)m_Mobile).VendorBuy( from );
-					m_Mobile.FocusMob = from;
+					vendor.VendorBuy( from );
+					vendor.FocusMob = from;
 				}
 				else if ( WasNamed( e.Speech ) )
 				{
@@ -138,18 +138,18 @@ namespace Server.Mobiles
 					{
 						e.Handled = true;
 
-						((BaseVendor)m_Mobile).VendorSell( from );
+						vendor.VendorSell( from );
 					}
 					else if ( e.HasKeyword( 0x171 ) ) // *buy*
 					{
 						e.Handled = true;
 
-						((BaseVendor)m_Mobile).VendorBuy( from );
+						vendor.VendorBuy( from );
 					}
 
-					m_Mobile.FocusMob = from;
+					vendor.FocusMob = from;
 				}
 			}
 		}
 	}
-}
+}

Scripts/Mobiles/Animals/Mounts/BaseMount.cs

@@ -59,9 +59,7 @@ namespace Server.Mobiles
 
 		public override void OnAfterDelete()
 		{
-			if ( m_InternalItem != null )
-				m_InternalItem.Delete();
-
+			m_InternalItem?.Delete();
 			m_InternalItem = null;
 
 			base.OnAfterDelete();
@@ -196,10 +194,7 @@ namespace Server.Mobiles
 		{
 			get
 			{
-				if ( m_InternalItem != null )
-					return m_InternalItem.ItemID;
-				else
-					return 0;
+				return m_InternalItem?.ItemID ?? 0;
 			}
 			set
 			{
@@ -242,8 +237,7 @@ namespace Server.Mobiles
 						Location = loc;
 						Map = map;
 
-						if ( m_InternalItem != null )
-							m_InternalItem.Internalize();
+						m_InternalItem?.Internalize();
 					}
 					else
 					{
@@ -280,10 +274,9 @@ namespace Server.Mobiles
 		{
 			bool result = true;
 
-			if ((mob is PlayerMobile) && (mob as PlayerMobile).MountBlockReason != BlockMountType.None)
+			if ((mob is PlayerMobile mobile) && mobile.MountBlockReason != BlockMountType.None)
 			{
-				mob.SendLocalizedMessage((int)(mob as PlayerMobile).MountBlockReason);
-
+				mobile.SendLocalizedMessage((int)mobile.MountBlockReason);
 				result = false;
 			}
 
@@ -333,9 +326,7 @@ namespace Server.Mobiles
 
 		public override void OnAfterDelete()
 		{
-			if ( m_Mount != null )
-				m_Mount.Delete();
-
+			m_Mount?.Delete();
 			m_Mount = null;
 
 			base.OnAfterDelete();

Scripts/Mobiles/Animals/Mounts/Ethereals.cs

@@ -345,8 +345,7 @@ namespace Server.Mobiles
 
 		public static void StopMounting( Mobile mob )
 		{
-			if ( mob.Spell is EtherealSpell )
-				( (EtherealSpell)mob.Spell ).Stop();
+			(mob.Spell as EtherealSpell)?.Stop();
 		}
 
 		public void OnRiderDamaged( int amount, Mobile from, bool willKill )