Modernize null-check patterns: use 'is null' and 'is not null'

Replace '== null' with 'is null' and '!= null' with 'is not null'
across 19 core files following modern C# pattern matching conventions.

Only literal null comparisons are changed. Assignments, value
comparisons, and LINQ expressions are left untouched.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

MinecraftClient/ChatBots/AutoFishing.cs

@@ -474,7 +474,7 @@ namespace MinecraftClient.ChatBots
 
         public override void OnEntityDespawn(Entity entity)
         {
-            if (entity != null && fishingBobber != null && entity.Type == EntityType.FishingBobber && entity.ID == fishingBobber!.ID)
+            if (entity is not null && fishingBobber is not null && entity.Type == EntityType.FishingBobber && entity.ID == fishingBobber!.ID)
             {
                 if (Config.Log_Fish_Bobber)
                     LogToConsole(string.Format("FishingBobber despawn at {0}", entity.Location));
@@ -499,7 +499,7 @@ namespace MinecraftClient.ChatBots
 
         public override void OnEntityMove(Entity entity)
         {
-            if (isFishing && entity != null && fishingBobber!.ID == entity.ID &&
+            if (isFishing && entity is not null && fishingBobber!.ID == entity.ID &&
                 (state == FishingState.WaitingFishToBite || state == FishingState.WaitingFishingBobber))
             {
                 Location Pos = entity.Location;
@@ -603,12 +603,12 @@ namespace MinecraftClient.ChatBots
 
             LocationConfig curConfig = locationList[curLocationIdx];
 
-            if (curConfig.facing != null)
+            if (curConfig.facing is not null)
                 (nextYaw, nextPitch) = ((float)curConfig.facing.Value.yaw, (float)curConfig.facing.Value.pitch);
             else
                 (nextYaw, nextPitch) = (GetYaw(), GetPitch());
 
-            if (curConfig.XYZ != null)
+            if (curConfig.XYZ is not null)
             {
                 Location current = GetCurrentLocation();
                 Location goal = new(curConfig.XYZ.Value.x, curConfig.XYZ.Value.y, curConfig.XYZ.Value.z);

MinecraftClient/ChatBots/AutoRespond.cs

@@ -132,7 +132,7 @@ namespace MinecraftClient.ChatBots
                 if (String.IsNullOrEmpty(toSend))
                     return null;
 
-                if (regex != null)
+                if (regex is not null)
                 {
                     if (regex.IsMatch(message))
                     {
@@ -261,15 +261,15 @@ namespace MinecraftClient.ChatBots
         /// <param name="cooldown">Minimal cooldown between two matches</param>
         private void CheckAddMatch(Regex? matchRegex, string? matchString, string? matchAction, string? matchActionPrivate, string? matchActionOther, bool ownersOnly, TimeSpan cooldown)
         {
-            if (matchRegex != null || matchString != null || matchAction != null || matchActionPrivate != null || matchActionOther != null || ownersOnly || cooldown != TimeSpan.Zero)
+            if (matchRegex is not null || matchString is not null || matchAction is not null || matchActionPrivate is not null || matchActionOther is not null || ownersOnly || cooldown != TimeSpan.Zero)
             {
-                RespondRule rule = matchRegex != null
+                RespondRule rule = matchRegex is not null
                     ? new RespondRule(matchRegex, matchAction, matchActionPrivate, matchActionOther, ownersOnly, cooldown)
                     : new RespondRule(matchString, matchAction, matchActionPrivate, matchActionOther, ownersOnly, cooldown);
 
-                if (matchAction != null || matchActionPrivate != null || matchActionOther != null)
+                if (matchAction is not null || matchActionPrivate is not null || matchActionOther is not null)
                 {
-                    if (matchRegex != null || matchString != null)
+                    if (matchRegex is not null || matchString is not null)
                     {
                         respondRules!.Add(rule);
                         LogDebugToConsole(string.Format(Translations.bot_autoRespond_loaded_match, rule));

MinecraftClient/ChatBots/DiscordBridge.cs

@@ -153,11 +153,11 @@ namespace MinecraftClient.ChatBots
 
         private void Disconnect()
         {
-            if (discordBotClient != null)
+            if (discordBotClient is not null)
             {
                 try
                 {
-                    if (discordChannel != null)
+                    if (discordChannel is not null)
                         discordBotClient.SendMessageAsync(discordChannel, new DiscordEmbedBuilder
                         {
                             Description = Translations.bot_DiscordBridge_disconnected,
@@ -284,7 +284,7 @@ namespace MinecraftClient.ChatBots
                     filePath = filePath[(filePath.IndexOf(Path.DirectorySeparatorChar) + 1)..];
                     var messageBuilder = new DiscordMessageBuilder();
 
-                    if (text != null)
+                    if (text is not null)
                         messageBuilder.WithContent(text);
 
                     messageBuilder.AddFiles(new Dictionary<string, Stream>() { { filePath, fs } });
@@ -309,7 +309,7 @@ namespace MinecraftClient.ChatBots
 
         private bool CanSendMessages()
         {
-            return discordBotClient != null && discordChannel != null && bridgeDirection != BridgeDirection.Minecraft;
+            return discordBotClient is not null && discordChannel is not null && bridgeDirection != BridgeDirection.Minecraft;
         }
 
         async Task MainAsync()

MinecraftClient/ChatBots/FollowPlayer.cs

@@ -110,13 +110,13 @@ namespace MinecraftClient.ChatBots
                 && !string.IsNullOrEmpty(entity.Name)
                 && entity.Name.Equals(name, StringComparison.OrdinalIgnoreCase));
 
-            if (player == null)
+            if (player is null)
                 return r.SetAndReturn(CmdResult.Status.Fail, Translations.cmd_follow_invalid_player);
 
             if (!CanMoveThere(player.Location))
                 return r.SetAndReturn(CmdResult.Status.Fail, Translations.cmd_follow_cant_reach_player);
 
-            if (_playerToFollow != null && _playerToFollow.Equals(name, StringComparison.OrdinalIgnoreCase))
+            if (_playerToFollow is not null && _playerToFollow.Equals(name, StringComparison.OrdinalIgnoreCase))
                 return r.SetAndReturn(CmdResult.Status.Fail,
                     string.Format(Translations.cmd_follow_already_following, _playerToFollow));
 
@@ -127,7 +127,7 @@ namespace MinecraftClient.ChatBots
 
             var result =
                 string.Format(
-                    _playerToFollow != null ? Translations.cmd_follow_switched : Translations.cmd_follow_started,
+                    _playerToFollow is not null ? Translations.cmd_follow_switched : Translations.cmd_follow_started,
                     player.Name!);
             _playerToFollow = name.ToLower();
 
@@ -152,7 +152,7 @@ namespace MinecraftClient.ChatBots
 
         private int OnCommandStop(CmdResult r)
         {
-            if (_playerToFollow == null)
+            if (_playerToFollow is null)
                 return r.SetAndReturn(CmdResult.Status.Fail, Translations.cmd_follow_already_stopped);
 
             var movementLock = BotMovementLock.Instance;
@@ -172,7 +172,7 @@ namespace MinecraftClient.ChatBots
             if (entity.Type != EntityType.Player)
                 return;
 
-            if (_playerToFollow == null || string.IsNullOrEmpty(entity.Name))
+            if (_playerToFollow is null || string.IsNullOrEmpty(entity.Name))
                 return;
 
             if (_playerToFollow != entity.Name.ToLower())
@@ -200,7 +200,7 @@ namespace MinecraftClient.ChatBots
             if (entity.Type != EntityType.Player)
                 return;
 
-            if (_playerToFollow != null && !string.IsNullOrEmpty(entity.Name) &&
+            if (_playerToFollow is not null && !string.IsNullOrEmpty(entity.Name) &&
                 _playerToFollow.Equals(entity.Name, StringComparison.OrdinalIgnoreCase))
             {
                 LogToConsole(string.Format(Translations.cmd_follow_player_came_to_the_range, _playerToFollow));
@@ -213,7 +213,7 @@ namespace MinecraftClient.ChatBots
             if (entity.Type != EntityType.Player)
                 return;
 
-            if (_playerToFollow != null && !string.IsNullOrEmpty(entity.Name) &&
+            if (_playerToFollow is not null && !string.IsNullOrEmpty(entity.Name) &&
                 _playerToFollow.Equals(entity.Name, StringComparison.OrdinalIgnoreCase))
             {
                 LogToConsole(string.Format(Translations.cmd_follow_player_left_the_range, _playerToFollow));
@@ -223,7 +223,7 @@ namespace MinecraftClient.ChatBots
 
         public override void OnPlayerLeave(Guid uuid, string? name)
         {
-            if (_playerToFollow != null && !string.IsNullOrEmpty(name) &&
+            if (_playerToFollow is not null && !string.IsNullOrEmpty(name) &&
                 _playerToFollow.Equals(name, StringComparison.OrdinalIgnoreCase))
             {
                 LogToConsole(string.Format(Translations.cmd_follow_player_left, _playerToFollow));
@@ -235,7 +235,7 @@ namespace MinecraftClient.ChatBots
         private bool CanMoveThere(Location location)
         {
             var chunkColumn = GetWorld().GetChunkColumn(location);
-            return chunkColumn != null && chunkColumn.FullyLoaded != false;
+            return chunkColumn is not null && chunkColumn.FullyLoaded != false;
         }
     }
 }

MinecraftClient/Commands/Entitycmd.cs

@@ -260,20 +260,20 @@ namespace MinecraftClient.Commands
                     sb.Append($"\n [MCC] {Translations.cmd_entityCmd_item}: {item.GetTypeString()} x{item.Count} - {displayName}§8");
             }
 
-            if (entity.Equipment.Count >= 1 && entity.Equipment != null)
+            if (entity.Equipment is not null && entity.Equipment.Count >= 1)
             {
                 sb.Append($"\n [MCC] {Translations.cmd_entityCmd_equipment}:");
-                if (entity.Equipment.ContainsKey(0) && entity.Equipment[0] != null)
+                if (entity.Equipment.ContainsKey(0) && entity.Equipment[0] is not null)
                     sb.Append($"\n   [MCC] {Translations.cmd_entityCmd_mainhand}: {entity.Equipment[0].GetTypeString()} x{entity.Equipment[0].Count}");
-                if (entity.Equipment.ContainsKey(1) && entity.Equipment[1] != null)
+                if (entity.Equipment.ContainsKey(1) && entity.Equipment[1] is not null)
                     sb.Append($"\n   [MCC] {Translations.cmd_entityCmd_offhand}: {entity.Equipment[1].GetTypeString()} x{entity.Equipment[1].Count}");
-                if (entity.Equipment.ContainsKey(5) && entity.Equipment[5] != null)
+                if (entity.Equipment.ContainsKey(5) && entity.Equipment[5] is not null)
                     sb.Append($"\n   [MCC] {Translations.cmd_entityCmd_helmet}: {entity.Equipment[5].GetTypeString()} x{entity.Equipment[5].Count}");
-                if (entity.Equipment.ContainsKey(4) && entity.Equipment[4] != null)
+                if (entity.Equipment.ContainsKey(4) && entity.Equipment[4] is not null)
                     sb.Append($"\n   [MCC] {Translations.cmd_entityCmd_chestplate}: {entity.Equipment[4].GetTypeString()} x{entity.Equipment[4].Count}");
-                if (entity.Equipment.ContainsKey(3) && entity.Equipment[3] != null)
+                if (entity.Equipment.ContainsKey(3) && entity.Equipment[3] is not null)
                     sb.Append($"\n   [MCC] {Translations.cmd_entityCmd_leggings}: {entity.Equipment[3].GetTypeString()} x{entity.Equipment[3].Count}");
-                if (entity.Equipment.ContainsKey(2) && entity.Equipment[2] != null)
+                if (entity.Equipment.ContainsKey(2) && entity.Equipment[2] is not null)
                     sb.Append($"\n   [MCC] {Translations.cmd_entityCmd_boots}: {entity.Equipment[2].GetTypeString()} x{entity.Equipment[2].Count}");
             }
 

MinecraftClient/ConsoleIO.cs

@@ -225,7 +225,7 @@ namespace MinecraftClient
                         sugList.Add(new("/"));
 
                         var childs = McClient.dispatcher.GetRoot().Children;
-                        if (childs != null)
+                        if (childs is not null)
                             foreach (var child in childs)
                                 sugList.Add(new(child.Name));
 
@@ -247,7 +247,7 @@ namespace MinecraftClient
                     else
                     {
                         CommandDispatcher<CmdResult>? dispatcher = McClient.dispatcher;
-                        if (dispatcher == null)
+                        if (dispatcher is null)
                             return;
 
                         ParseResults<CmdResult> parse = dispatcher.Parse(command, CmdResult.Empty);

MinecraftClient/Inventory/Item.cs

@@ -82,20 +82,20 @@ namespace MinecraftClient.Inventory
         {
             get
             {
-                if (Components != null)
+                if (Components is not null)
                 {
                     var customName = Components.OfType<CustomNameComponent>().FirstOrDefault();
-                    if (customName != null && !string.IsNullOrEmpty(customName.CustomName))
+                    if (customName is not null && !string.IsNullOrEmpty(customName.CustomName))
                         return customName.CustomName;
 
                     var itemName = Components.OfType<ItemNameComponent>().FirstOrDefault();
-                    if (itemName != null && !string.IsNullOrEmpty(itemName.ItemName))
+                    if (itemName is not null && !string.IsNullOrEmpty(itemName.ItemName))
                         return itemName.ItemName;
 
                     return null;
                 }
 
-                if (NBT != null && NBT.ContainsKey("display"))
+                if (NBT is not null && NBT.ContainsKey("display"))
                 {
                     if (NBT["display"] is Dictionary<string, object> displayProperties &&
                         displayProperties.ContainsKey("Name"))
@@ -117,17 +117,17 @@ namespace MinecraftClient.Inventory
         {
             get
             {
-                if (Components != null)
+                if (Components is not null)
                 {
                     var loreComponent = Components.OfType<LoreNameComponent1206>().FirstOrDefault();
-                    if (loreComponent != null && loreComponent.Lines.Count > 0)
+                    if (loreComponent is not null && loreComponent.Lines.Count > 0)
                         return loreComponent.Lines.ToArray();
 
                     return null;
                 }
 
                 List<string> lores = new();
-                if (NBT != null && NBT.ContainsKey("display"))
+                if (NBT is not null && NBT.ContainsKey("display"))
                 {
                     if (NBT["display"] is Dictionary<string, object> displayProperties &&
                         displayProperties.ContainsKey("Lore"))
@@ -151,19 +151,19 @@ namespace MinecraftClient.Inventory
         {
             get
             {
-                if (Components != null)
+                if (Components is not null)
                 {
                     var damageComponent = Components.OfType<DamageComponent>().FirstOrDefault();
-                    if (damageComponent != null)
+                    if (damageComponent is not null)
                         return damageComponent.Damage;
 
                     return 0;
                 }
 
-                if (NBT != null && NBT.ContainsKey("Damage"))
+                if (NBT is not null && NBT.ContainsKey("Damage"))
                 {
                     object damage = NBT["Damage"];
-                    if (damage != null)
+                    if (damage is not null)
                     {
                         return int.Parse(damage.ToString() ?? string.Empty, NumberStyles.Any,
                             CultureInfo.CurrentCulture);
@@ -183,11 +183,11 @@ namespace MinecraftClient.Inventory
         {
             get
             {
-                if (Components == null)
+                if (Components is null)
                     return null;
 
                 var enchComp = Components.OfType<EnchantmentsComponent>().FirstOrDefault();
-                if (enchComp != null && enchComp.Enchantments.Count > 0)
+                if (enchComp is not null && enchComp.Enchantments.Count > 0)
                     return enchComp.Enchantments;
 
                 return null;
@@ -220,7 +220,7 @@ namespace MinecraftClient.Inventory
             try
             {
                 var enchList = EnchantmentList;
-                if (enchList != null)
+                if (enchList is not null)
                 {
                     foreach (var ench in enchList)
                     {
@@ -229,7 +229,7 @@ namespace MinecraftClient.Inventory
                         sb.AppendFormat(" | {0} {1}", name, level);
                     }
                 }
-                else if (NBT != null && (NBT.TryGetValue("Enchantments", out object? enchantments) ||
+                else if (NBT is not null && (NBT.TryGetValue("Enchantments", out object? enchantments) ||
                                          NBT.TryGetValue("StoredEnchantments", out enchantments)))
                 {
                     foreach (Dictionary<string, object> enchantment in (object[])enchantments)
@@ -242,7 +242,7 @@ namespace MinecraftClient.Inventory
                     }
                 }
 
-                if (Lores != null && Lores.Length > 0)
+                if (Lores is not null && Lores.Length > 0)
                 {
                     foreach (var lore in Lores)
                         sb.AppendFormat(" | {0}", lore);

MinecraftClient/Inventory/ItemMovingHelper.cs

@@ -38,9 +38,9 @@ namespace MinecraftClient.Inventory
             // Condition: source has item and dest has no item
             if (ValidateSlots(source, dest, destContainer) &&
                 HasItem(source) &&
-                ((destContainer != null && !HasItem(dest, destContainer)) || (destContainer == null && !HasItem(dest))))
+                ((destContainer is not null && !HasItem(dest, destContainer)) || (destContainer is null && !HasItem(dest))))
                 return mc.DoWindowAction(c.ID, source, WindowActionType.LeftClick)
-                    && mc.DoWindowAction(destContainer == null ? c.ID : destContainer.ID, dest, WindowActionType.LeftClick);
+                    && mc.DoWindowAction(destContainer is null ? c.ID : destContainer.ID, dest, WindowActionType.LeftClick);
             else return false;
         }
 
@@ -56,9 +56,9 @@ namespace MinecraftClient.Inventory
             // Condition: Both slot1 and slot2 has item
             if (ValidateSlots(slot1, slot2, destContainer) &&
                 HasItem(slot1) &&
-                (destContainer != null && HasItem(slot2, destContainer) || (destContainer == null && HasItem(slot2))))
+                (destContainer is not null && HasItem(slot2, destContainer) || (destContainer is null && HasItem(slot2))))
                 return mc.DoWindowAction(c.ID, slot1, WindowActionType.LeftClick)
-                    && mc.DoWindowAction(destContainer == null ? c.ID : destContainer.ID, slot2, WindowActionType.LeftClick)
+                    && mc.DoWindowAction(destContainer is null ? c.ID : destContainer.ID, slot2, WindowActionType.LeftClick)
                     && mc.DoWindowAction(c.ID, slot1, WindowActionType.LeftClick);
             else return false;
         }
@@ -126,7 +126,7 @@ namespace MinecraftClient.Inventory
         /// <returns>The compare result</returns>
         private bool ValidateSlots(int s1, int s2, Container? s2Container = null)
         {
-            if (s2Container == null)
+            if (s2Container is null)
                 return (s1 != s2 && s1 < c.Type.SlotCount() && s2 < c.Type.SlotCount());
             else
                 return (s1 < c.Type.SlotCount() && s2 < s2Container.Type.SlotCount());
@@ -153,7 +153,7 @@ namespace MinecraftClient.Inventory
         /// <returns>True if they are equal</returns>
         private bool ItemTypeEqual(int slot1, int slot2, Container? s2Container = null)
         {
-            if (s2Container == null)
+            if (s2Container is null)
             {
                 if (HasItem(slot1) && HasItem(slot2))
                     return c.Items[slot1].Type == c.Items[slot2].Type;

MinecraftClient/Mapping/Movement.cs

@@ -247,7 +247,7 @@ namespace MinecraftClient.Mapping
             }
 
             // Goal could not be reached. Set the path to the closest location if close enough
-            if (current != null && openSet.MinHScoreNode != null &&
+            if (current is not null && openSet.MinHScoreNode is not null &&
                 (maxOffset == int.MaxValue || openSet.MinHScoreNode.HScore <= maxOffset))
                 return ReconstructPath(cameFrom, openSet.MinHScoreNode.Location, start, goal);
 
@@ -362,7 +362,7 @@ namespace MinecraftClient.Mapping
                 locationList.Add(loc);
 
                 // Save node with the smallest H-Score => Distance to goal
-                if (MinHScoreNode == null || newNode.HScore < MinHScoreNode.HScore)
+                if (MinHScoreNode is null || newNode.HScore < MinHScoreNode.HScore)
                     MinHScoreNode = newNode;
 
                 if (i == 0)
@@ -491,7 +491,7 @@ namespace MinecraftClient.Mapping
         public static bool IsOnGround(World world, Location location)
         {
             ChunkColumn? chunkColumn = world.GetChunkColumn(location);
-            if (chunkColumn == null || chunkColumn.FullyLoaded == false)
+            if (chunkColumn is null || chunkColumn.FullyLoaded == false)
                 return true; // avoid moving downward in a not loaded chunk
 
             Location down = Move(location, Direction.Down);
@@ -721,11 +721,11 @@ namespace MinecraftClient.Mapping
         public static bool CheckChunkLoading(World world, Location start, Location dest)
         {
             var chunkColumn = world.GetChunkColumn(dest);
-            if (chunkColumn == null || chunkColumn.FullyLoaded == false)
+            if (chunkColumn is null || chunkColumn.FullyLoaded == false)
                 return false;
 
             chunkColumn = world.GetChunkColumn(start);
-            if (chunkColumn == null || chunkColumn.FullyLoaded == false)
+            if (chunkColumn is null || chunkColumn.FullyLoaded == false)
                 return false;
 
             return true;

MinecraftClient/Mapping/World.cs

@@ -55,7 +55,7 @@ namespace MinecraftClient.Mapping
             set
             {
                 Tuple<int, int> chunkCoord = new(chunkX, chunkZ);
-                if (value == null)
+                if (value is null)
                     chunks.TryRemove(chunkCoord, out _);
                 else
                     chunks.AddOrUpdate(chunkCoord, value, (_, _) => value);
@@ -385,10 +385,10 @@ namespace MinecraftClient.Mapping
         public Block GetBlock(Location location)
         {
             ChunkColumn? column = GetChunkColumn(location);
-            if (column != null)
+            if (column is not null)
             {
                 Chunk? chunk = column.GetChunk(location);
-                if (chunk != null)
+                if (chunk is not null)
                     return chunk.GetBlock(location);
             }
             return Block.Air;
@@ -437,10 +437,10 @@ namespace MinecraftClient.Mapping
         public void SetBlock(Location location, Block block)
         {
             ChunkColumn? column = this[location.ChunkX, location.ChunkZ];
-            if (column != null && column.ColumnSize >= location.ChunkY)
+            if (column is not null && column.ColumnSize >= location.ChunkY)
             {
                 Chunk? chunk = column.GetChunk(location);
-                if (chunk == null)
+                if (chunk is null)
                     column[location.ChunkY] = chunk = new Chunk();
                 chunk[location.ChunkBlockX, location.ChunkBlockY, location.ChunkBlockZ] = block;
             }

MinecraftClient/Program.cs

@@ -120,7 +120,7 @@ namespace MinecraftClient
             ConsoleIO.WriteLine($"Minecraft Console Client v{Version} - for MC {MCLowestVersion} to {MCHighestVersion} - Github.com/MCCTeam");
 
             //Build information to facilitate processing of bug reports
-            if (BuildInfo != null)
+            if (BuildInfo is not null)
                 ConsoleIO.WriteLineFormatted("§8" + BuildInfo);
 
             //Debug input ?
@@ -616,11 +616,11 @@ namespace MinecraftClient
                             ConsoleIO.WriteLineFormatted("§8" + string.Format(Translations.mcc_profile_key_valid, session.PlayerName));
                     }
 
-                    if (playerKeyPair == null || playerKeyPair.NeedRefresh())
+                    if (playerKeyPair is null || playerKeyPair.NeedRefresh())
                     {
                         ConsoleIO.WriteLineFormatted(Translations.mcc_fetching_key, acceptnewlines: true);
                         playerKeyPair = KeyUtils.GetNewProfileKeys(session.ID, Config.Main.General.AccountType == LoginType.yggdrasil);
-                        if (Config.Main.Advanced.ProfileKeyCache != CacheType.none && playerKeyPair != null)
+                        if (Config.Main.Advanced.ProfileKeyCache != CacheType.none && playerKeyPair is not null)
                         {
                             KeysCache.Store(loginLower, playerKeyPair);
                         }
@@ -628,7 +628,7 @@ namespace MinecraftClient
                 }
 
                 //Force-enable Forge support?
-                if (!isRealms && (Config.Main.Advanced.EnableForge == ForgeConfigType.force) && forgeInfo == null)
+                if (!isRealms && (Config.Main.Advanced.EnableForge == ForgeConfigType.force) && forgeInfo is null)
                 {
                     if (ProtocolHandler.ProtocolMayForceForge(protocolversion))
                     {
@@ -724,8 +724,8 @@ namespace MinecraftClient
             ConsoleInteractive.ConsoleReader.StopReadThread();
             new Thread(new ThreadStart(delegate
             {
-                if (client != null) { client.Disconnect(); ConsoleIO.Reset(); }
+                if (client is not null) { client.Disconnect(); ConsoleIO.Reset(); }
-                if (offlinePrompt != null) { offlinePrompt.Item2.Cancel(); offlinePrompt.Item1.Join(); offlinePrompt = null; ConsoleIO.Reset(); }
+                if (offlinePrompt is not null) { offlinePrompt.Item2.Cancel(); offlinePrompt.Item1.Join(); offlinePrompt = null; ConsoleIO.Reset(); }
                 if (delaySeconds > 0)
                 {
                     ConsoleIO.WriteLine(string.Format(Translations.mcc_restart_delay, delaySeconds));
@@ -743,8 +743,8 @@ namespace MinecraftClient
             ConsoleInteractive.ConsoleSuggestion.ClearSuggestions();
             ConsoleIO.WriteLineFormatted("§a" + string.Format(Translations.config_saving, settingsIniPath));
 
-            if (client != null) { client.Disconnect(); ConsoleIO.Reset(); }
+            if (client is not null) { client.Disconnect(); ConsoleIO.Reset(); }
-            if (offlinePrompt != null) { offlinePrompt.Item2.Cancel(); offlinePrompt.Item1.Join(); offlinePrompt = null; ConsoleIO.Reset(); }
+            if (offlinePrompt is not null) { offlinePrompt.Item2.Cancel(); offlinePrompt.Item1.Join(); offlinePrompt = null; ConsoleIO.Reset(); }
             if (Config.Main.Advanced.PlayerHeadAsIcon) { ConsoleIcon.RevertToMCCIcon(); }
             Environment.Exit(exitcode);
         }
@@ -801,7 +801,7 @@ namespace MinecraftClient
                         return; //AutoRelog is triggering a restart of the client, don't turn on the offline prompt
                 }
                 
-                if (offlinePrompt == null)
+                if (offlinePrompt is null)
                 {
                     ConsoleInteractive.ConsoleReader.StopReadThread();
 
@@ -907,7 +907,7 @@ namespace MinecraftClient
         /// <returns></returns>
         public static Type[] GetTypesInNamespace(string nameSpace, Assembly? assembly = null)
         {
-            if (assembly == null) { assembly = Assembly.GetExecutingAssembly(); }
+            if (assembly is null) { assembly = Assembly.GetExecutingAssembly(); }
             return assembly.GetTypes().Where(t => string.Equals(t.Namespace, nameSpace, StringComparison.Ordinal)).ToArray();
         }
 

MinecraftClient/Protocol/Handlers/DataTypes.cs

@@ -1350,7 +1350,7 @@ namespace MinecraftClient.Protocol.Handlers
         /// <returns>Byte array for this NBT tag</returns>
         private byte[] GetNbt(Dictionary<string, object>? nbt, bool root)
         {
-            if (nbt == null || nbt.Count == 0)
+            if (nbt is null || nbt.Count == 0)
                 return new byte[] { 0 }; // TAG_End
 
             List<byte> bytes = new();
@@ -1699,7 +1699,7 @@ namespace MinecraftClient.Protocol.Handlers
         {
             List<byte> slotData = new();
 
-            if (item == null || item.IsEmpty)
+            if (item is null || item.IsEmpty)
             {
                 slotData.AddRange(GetBool(false));
             }
@@ -1727,7 +1727,7 @@ namespace MinecraftClient.Protocol.Handlers
 
             if (protocolversion >= Protocol18Handler.MC_1_20_6_Version)
             {
-                if (item == null || item.IsEmpty)
+                if (item is null || item.IsEmpty)
                 {
                     slotData.AddRange(GetVarInt(0));
                 }
@@ -1736,7 +1736,7 @@ namespace MinecraftClient.Protocol.Handlers
                     slotData.AddRange(GetVarInt(item.Count));
                     slotData.AddRange(GetVarInt(itemPalette.ToId(item.Type)));
 
-                    if (item.Components != null && item.Components.Count > 0)
+                    if (item.Components is not null && item.Components.Count > 0)
                     {
                         slotData.AddRange(GetVarInt(item.Components.Count));
                         slotData.AddRange(GetVarInt(0)); // components to remove
@@ -1756,7 +1756,7 @@ namespace MinecraftClient.Protocol.Handlers
             }
             else if (protocolversion > Protocol18Handler.MC_1_13_Version)
             {
-                if (item == null || item.IsEmpty)
+                if (item is null || item.IsEmpty)
                     slotData.AddRange(GetBool(false));
                 else
                 {
@@ -1768,7 +1768,7 @@ namespace MinecraftClient.Protocol.Handlers
             }
             else
             {
-                if (item == null || item.IsEmpty)
+                if (item is null || item.IsEmpty)
                     slotData.AddRange(GetShort(-1));
                 else
                 {
@@ -1849,7 +1849,7 @@ namespace MinecraftClient.Protocol.Handlers
         /// <returns>String representation</returns>
         public string ByteArrayToString(byte[]? bytes)
         {
-            if (bytes == null)
+            if (bytes is null)
                 return "null";
             else
                 return BitConverter.ToString(bytes).Replace("-", " ");
@@ -1890,7 +1890,7 @@ namespace MinecraftClient.Protocol.Handlers
         {
             List<byte> fields = new();
             fields.AddRange(GetLastSeenMessageList(ack.lastSeen, isOnlineMode));
-            if (!isOnlineMode || ack.lastReceived == null)
+            if (!isOnlineMode || ack.lastReceived is null)
                 fields.AddRange(GetBool(false)); // Has last received message
             else
             {

MinecraftClient/Protocol/Message/ChatParser.cs

@@ -123,7 +123,7 @@ namespace MinecraftClient.Protocol.Message
         {
             string sender = message.isSenderJson ? ParseText(message.displayName!) : message.displayName!;
             string content;
-            if (Config.Signature.ShowModifiedChat && message.unsignedContent != null)
+            if (Config.Signature.ShowModifiedChat && message.unsignedContent is not null)
             {
                 content = ParseText(message.unsignedContent!);
                 if (string.IsNullOrEmpty(content))
@@ -315,7 +315,7 @@ namespace MinecraftClient.Protocol.Message
                     Task<Dictionary<string, string>?> fetckFileTask =
                         httpClient.GetFromJsonAsync<Dictionary<string, string>>(translation_file_location);
                     fetckFileTask.Wait();
-                    if (fetckFileTask.Result != null && fetckFileTask.Result.Count > 0)
+                    if (fetckFileTask.Result is not null && fetckFileTask.Result.Count > 0)
                     {
                         TranslationRules = fetckFileTask.Result;
                         TranslationRules["Version"] = TranslationsFile_Version;

MinecraftClient/Protocol/PlayerInfo.cs

@@ -44,13 +44,13 @@ namespace MinecraftClient.Protocol
         {
             Uuid = uuid;
             Name = name;
-            if (property != null)
+            if (property is not null)
                 Property = property;
             Gamemode = gamemode;
             Ping = ping;
             DisplayName = displayName;
             lastMessageVerified = false;
-            if (timeStamp != null && publicKey != null && signature != null)
+            if (timeStamp is not null && publicKey is not null && signature is not null)
             {
                 DateTimeOffset dateTimeOffset = DateTimeOffset.FromUnixTimeMilliseconds((long)timeStamp);
                 KeyExpiresAt = dateTimeOffset.UtcDateTime;
@@ -119,7 +119,7 @@ namespace MinecraftClient.Protocol
         /// <returns>Is this message vaild</returns>
         public bool VerifyMessage(string message, long timestamp, long salt, ref byte[] signature)
         {
-            if (PublicKey == null || IsKeyExpired())
+            if (PublicKey is null || IsKeyExpired())
                 return false;
             else
             {
@@ -146,12 +146,12 @@ namespace MinecraftClient.Protocol
         {
             if (lastMessageVerified == false)
                 return false;
-            if (PublicKey == null || IsKeyExpired() || (this.precedingSignature != null && precedingSignature == null))
+            if (PublicKey is null || IsKeyExpired() || (this.precedingSignature is not null && precedingSignature is null))
             {
                 lastMessageVerified = false;
                 return false;
             }
-            if (this.precedingSignature != null && !this.precedingSignature.SequenceEqual(precedingSignature!))
+            if (this.precedingSignature is not null && !this.precedingSignature.SequenceEqual(precedingSignature!))
             {
                 lastMessageVerified = false;
                 return false;
@@ -181,12 +181,12 @@ namespace MinecraftClient.Protocol
         {
             if (lastMessageVerified == false)
                 return false;
-            if (PublicKey == null || IsKeyExpired() || (this.precedingSignature != null && precedingSignature == null))
+            if (PublicKey is null || IsKeyExpired() || (this.precedingSignature is not null && precedingSignature is null))
             {
                 lastMessageVerified = false;
                 return false;
             }
-            if (this.precedingSignature != null && !this.precedingSignature.SequenceEqual(precedingSignature!))
+            if (this.precedingSignature is not null && !this.precedingSignature.SequenceEqual(precedingSignature!))
             {
                 lastMessageVerified = false;
                 return false;
@@ -212,7 +212,7 @@ namespace MinecraftClient.Protocol
         /// <returns>Is this message chain vaild</returns>
         public bool VerifyMessage(string message, Guid playerUuid, Guid chatUuid, int messageIndex, long timestamp, long salt, ref byte[] signature, Tuple<int, byte[]?>[] previousMessageSignatures)
         {
-            if (PublicKey == null || IsKeyExpired())
+            if (PublicKey is null || IsKeyExpired())
                 return false;
 
             // net.minecraft.server.network.ServerPlayNetworkHandler#validateMessage

MinecraftClient/Protocol/ProtocolHandler.cs

@@ -925,7 +925,7 @@ namespace MinecraftClient.Protocol
                 int code = DoHTTPSPost("authserver.mojang.com", 443, "/refresh", json_request, ref result);
                 if (code == 200)
                 {
-                    if (result == null)
+                    if (result is null)
                     {
                         return LoginResult.NullError;
                     }
@@ -976,7 +976,7 @@ namespace MinecraftClient.Protocol
                     Config.Main.General.AuthServer.UseHttps, ref result);
                 if (code == 200)
                 {
-                    if (result == null)
+                    if (result is null)
                     {
                         return LoginResult.NullError;
                     }
@@ -1251,7 +1251,7 @@ namespace MinecraftClient.Protocol
                             contentType = header.Value;
                     }
 
-                    if (body != null)
+                    if (body is not null)
                         request.Content = new StringContent(body, Encoding.UTF8, contentType);
 
                     if (Settings.Config.Logging.DebugMessages)
@@ -1279,9 +1279,9 @@ namespace MinecraftClient.Protocol
                     }
                 }
             }, TimeSpan.FromSeconds(30));
-            if (postResult != null)
+            if (postResult is not null)
                 result = postResult;
-            if (exception != null)
+            if (exception is not null)
                 throw exception;
             return statusCode;
         }

MinecraftClient/Scripting/CSharpRunner.cs

@@ -109,7 +109,7 @@ namespace MinecraftClient.Scripting
                     var result = compiler.Compile(code, Guid.NewGuid().ToString(), dlls);
 
                     //Process compile warnings and errors
-                    if (result.Failures != null)
+                    if (result.Failures is not null)
                     {
 
                         ConsoleIO.WriteLogLine("[Script] Compilation failed with error(s):");
@@ -309,7 +309,7 @@ namespace MinecraftClient.Scripting
         /// <returns>Value of the variable or null if no variable</returns>
         public object? GetVar(string varName)
         {
-            if (localVars != null && localVars.ContainsKey(varName))
+            if (localVars is not null && localVars.ContainsKey(varName))
                 return localVars[varName];
             else
                 return Config.AppVar.GetVar(varName);
@@ -322,7 +322,7 @@ namespace MinecraftClient.Scripting
         /// <param name="varValue">Value of the variable</param>
         public bool SetVar(string varName, object varValue)
         {
-            if (localVars != null && localVars.ContainsKey(varName))
+            if (localVars is not null && localVars.ContainsKey(varName))
                 localVars.Remove(varName);
             return Config.AppVar.SetVar(varName, varValue);
         }
@@ -339,12 +339,12 @@ namespace MinecraftClient.Scripting
             object? value = GetVar(varName);
             if (value is T Tval)
                 return Tval;
-            if (value != null)
+            if (value is not null)
             {
                 try
                 {
                     TypeConverter converter = TypeDescriptor.GetConverter(typeof(T));
-                    if (converter != null)
+                    if (converter is not null)
                         return (T?)converter.ConvertFromString(value.ToString() ?? string.Empty);
                 }
                 catch (NotSupportedException) { /* Was worth trying */ }

MinecraftClient/Scripting/ChatBot.cs

@@ -49,9 +49,9 @@ namespace MinecraftClient.Scripting
         {
             get
             {
-                if (master != null)
+                if (master is not null)
                     return master.Handler;
-                if (_handler != null)
+                if (_handler is not null)
                     return _handler;
                 throw new InvalidOperationException(Translations.exception_chatbot_init);
             }
@@ -862,7 +862,7 @@ namespace MinecraftClient.Scripting
         protected void LogToConsole(object? text)
         {
             string botName = Translations.ResourceManager.GetString("botname." + GetType().Name) ?? GetType().Name;
-            if (_handler == null || master == null)
+            if (_handler is null || master is null)
                 ConsoleIO.WriteLogLine(string.Format("[{0}] {1}", botName, text));
             else
                 Handler.Log.Info(string.Format("[{0}] {1}", botName, text));

MinecraftClient/TaskWithResult.cs

@@ -113,7 +113,7 @@ namespace MinecraftClient
             }
 
             // Receive exception from task
-            if (exception != null)
+            if (exception is not null)
                 throw exception;
 
             return result!;

MinecraftClient/UpgradeHelper.cs

@@ -211,7 +211,7 @@ namespace MinecraftClient
                 if (!cancellationToken.IsCancellationRequested)
                 {
                     HttpResponseMessage res = httpWebRequest.Result;
-                    if (res.Headers.Location != null)
+                    if (res.Headers.Location is not null)
                     {
                         Match match = Regex.Match(res.Headers.Location.ToString(), GithubReleaseUrl + @"/tag/(\d{4})(\d{2})(\d{2})-(\d+)");
                         if (match.Success && match.Groups.Count == 5)
@@ -284,7 +284,7 @@ namespace MinecraftClient
 
         private static bool CompareVersionInfo(string? current, string? latest)
         {
-            if (current == null || latest == null)
+            if (current is null || latest is null)
                 return false;
             Regex reg = new(@"\w+\sbuild\s(\d+),\sbuilt\son\s(\d{4})[-\/\.\s]?(\d{2})[-\/\.\s]?(\d{2}).*");
             Regex reg2 = new(@"\w+\sbuild\s(\d+),\sbuilt\son\s\w+\s(\d{2})[-\/\.\s]?(\d{2})[-\/\.\s]?(\d{4}).*");
@@ -297,13 +297,13 @@ namespace MinecraftClient
                 try { curTime = new(int.Parse(curMatch.Groups[2].Value), int.Parse(curMatch.Groups[3].Value), int.Parse(curMatch.Groups[4].Value)); }
                 catch { curTime = null; }
             }
-            if (curTime == null)
+            if (curTime is null)
             {
                 curMatch = reg2.Match(current);
                 try { curTime = new(int.Parse(curMatch.Groups[4].Value), int.Parse(curMatch.Groups[3].Value), int.Parse(curMatch.Groups[2].Value)); }
                 catch { curTime = null; }
             }
-            if (curTime == null)
+            if (curTime is null)
                 return false;
 
             Match latestMatch = reg.Match(latest);
@@ -312,13 +312,13 @@ namespace MinecraftClient
                 try { latestTime = new(int.Parse(latestMatch.Groups[2].Value), int.Parse(latestMatch.Groups[3].Value), int.Parse(latestMatch.Groups[4].Value)); }
                 catch { latestTime = null; }
             }
-            if (latestTime == null)
+            if (latestTime is null)
             {
                 latestMatch = reg2.Match(latest);
                 try { latestTime = new(int.Parse(latestMatch.Groups[4].Value), int.Parse(latestMatch.Groups[3].Value), int.Parse(latestMatch.Groups[2].Value)); }
                 catch { latestTime = null; }
             }
-            if (latestTime == null)
+            if (latestTime is null)
                 return false;
 
             int curBuildId, latestBuildId;