Use `is null`/`is not null`

DiscordChatExporter.Core/Discord/DiscordClient.cs

@@ -194,7 +194,7 @@ namespace DiscordChatExporter.Core.Discord
 
             var parentId = response.GetPropertyOrNull("parent_id")?.GetString().Pipe(Snowflake.Parse);
 
-            var category = parentId != null
+            var category = parentId is not null
                 ? await GetChannelCategoryAsync(parentId.Value)
                 : null;
 
@@ -224,7 +224,7 @@ namespace DiscordChatExporter.Core.Discord
             // will not appear in the output.
             // Additionally, it provides the date of the last message, which is used to calculate progress.
             var lastMessage = await TryGetLastMessageAsync(channelId, before);
-            if (lastMessage == null || lastMessage.Timestamp < after?.ToDate())
+            if (lastMessage is null || lastMessage.Timestamp < after?.ToDate())
                 yield break;
 
             // Keep track of first message in range in order to calculate progress

DiscordChatExporter.Core/Exporting/ExportContext.cs

@@ -57,7 +57,7 @@ namespace DiscordChatExporter.Core.Exporting
             var roles = member?.RoleIds.Join(Roles, i => i, r => r.Id, (_, role) => role);
 
             return roles?
-                .Where(r => r.Color != null)
+                .Where(r => r.Color is not null)
                 .OrderByDescending(r => r.Position)
                 .Select(r => r.Color)
                 .FirstOrDefault();

DiscordChatExporter.Core/Exporting/ExportRequest.cs

@@ -127,17 +127,17 @@ namespace DiscordChatExporter.Core.Exporting
             buffer.Append($"{guild.Name} - {channel.Category.Name} - {channel.Name} [{channel.Id}]");
 
             // Date range
-            if (after != null || before != null)
+            if (after is not null || before is not null)
             {
                 buffer.Append(" (");
 
                 // Both 'after' and 'before' are set
-                if (after != null && before != null)
+                if (after is not null && before is not null)
                 {
                     buffer.Append($"{after?.ToDate():yyyy-MM-dd} to {before?.ToDate():yyyy-MM-dd}");
                 }
                 // Only 'after' is set
-                else if (after != null)
+                else if (after is not null)
                 {
                     buffer.Append($"after {after?.ToDate():yyyy-MM-dd}");
                 }

DiscordChatExporter.Core/Exporting/MediaDownloader.cs

@@ -62,7 +62,7 @@ namespace DiscordChatExporter.Core.Exporting
                         : (DateTimeOffset?) null
                 );
 
-                if (lastModified != null)
+                if (lastModified is not null)
                 {
                     File.SetCreationTimeUtc(filePath, lastModified.Value.UtcDateTime);
                     File.SetLastWriteTimeUtc(filePath, lastModified.Value.UtcDateTime);

DiscordChatExporter.Core/Exporting/MessageExporter.cs

@@ -21,13 +21,13 @@ namespace DiscordChatExporter.Core.Exporting
 
         private bool IsPartitionLimitReached() =>
             _messageCount > 0 &&
-            _context.Request.PartitionLimit != null &&
+            _context.Request.PartitionLimit is not null &&
             _context.Request.PartitionLimit != 0 &&
             _messageCount % _context.Request.PartitionLimit == 0;
 
         private async ValueTask ResetWriterAsync()
         {
-            if (_writer != null)
+            if (_writer is not null)
             {
                 await _writer.WritePostambleAsync();
                 await _writer.DisposeAsync();
@@ -45,7 +45,7 @@ namespace DiscordChatExporter.Core.Exporting
             }
 
             // Writer is still valid - return
-            if (_writer != null)
+            if (_writer is not null)
                 return _writer;
 
             var filePath = GetPartitionFilePath(_context.Request.OutputBaseFilePath, _partitionIndex);

DiscordChatExporter.Core/Exporting/Writers/Html/MessageGroupTemplate.cshtml

@@ -17,7 +17,7 @@
 
     var userColor = Model.ExportContext.TryGetUserColor(Model.MessageGroup.Author.Id);
 
-    var userColorStyle = userColor != null
+    var userColorStyle = userColor is not null
         ? $"color: rgb({userColor?.R},{userColor?.G},{userColor?.B})"
         : null;
 
@@ -25,19 +25,19 @@
         ? Model.MessageGroup.Author.Name
         : userMember?.Nick ?? Model.MessageGroup.Author.Name;
 
-    var referencedUserMember = Model.MessageGroup.ReferencedMessage != null
+    var referencedUserMember = Model.MessageGroup.ReferencedMessage is not null
         ? Model.ExportContext.TryGetMember(Model.MessageGroup.ReferencedMessage.Author.Id)
         : null;
 
-    var referencedUserColor = Model.MessageGroup.ReferencedMessage != null
+    var referencedUserColor = Model.MessageGroup.ReferencedMessage is not null
         ? Model.ExportContext.TryGetUserColor(Model.MessageGroup.ReferencedMessage.Author.Id)
         : null;
 
-    var referencedUserColorStyle = referencedUserColor != null
+    var referencedUserColorStyle = referencedUserColor is not null
         ? $"color: rgb({referencedUserColor?.R},{referencedUserColor?.G},{referencedUserColor?.B})"
         : null;
 
-    var referencedUserNick = Model.MessageGroup.ReferencedMessage != null
+    var referencedUserNick = Model.MessageGroup.ReferencedMessage is not null
         ? Model.MessageGroup.ReferencedMessage.Author.IsBot
             ? Model.MessageGroup.ReferencedMessage.Author.Name
             : referencedUserMember?.Nick ?? Model.MessageGroup.ReferencedMessage.Author.Name
@@ -45,12 +45,12 @@
 }
 
 <div class="chatlog__message-group">
-    @if (Model.MessageGroup.Reference != null)
+    @if (Model.MessageGroup.Reference is not null)
     {
         <div class="chatlog__reference-symbol">
         </div>
         <div class="chatlog__reference">
-            @if (Model.MessageGroup.ReferencedMessage != null)
+            @if (Model.MessageGroup.ReferencedMessage is not null)
             {
                 <img class="chatlog__reference-avatar" src="@await ResolveUrlAsync(Model.MessageGroup.ReferencedMessage.Author.AvatarUrl)" alt="Avatar">
                 <span class="chatlog__reference-name" title="@Model.MessageGroup.ReferencedMessage.Author.FullName" style="@referencedUserColorStyle">@referencedUserNick</span>
@@ -66,7 +66,7 @@
                         }
                     </span>
 
-                    @if (Model.MessageGroup.ReferencedMessage.EditedTimestamp != null)
+                    @if (Model.MessageGroup.ReferencedMessage.EditedTimestamp is not null)
                     {
                         <span class="chatlog__reference-edited-timestamp" title="@FormatDate(Model.MessageGroup.ReferencedMessage.EditedTimestamp.Value)">(edited)</span>
                     }
@@ -98,13 +98,13 @@
             var isPinnedStyle = message.IsPinned ? "chatlog__message--pinned" : null;
 
             <div class="chatlog__message @isPinnedStyle" data-message-id="@message.Id" id="message-@message.Id">
-                @if (!string.IsNullOrWhiteSpace(message.Content) || message.EditedTimestamp != null)
+                @if (!string.IsNullOrWhiteSpace(message.Content) || message.EditedTimestamp is not null)
                 {
                     <div class="chatlog__content">
                         <div class="markdown">
                             <span class="preserve-whitespace">@Raw(FormatMarkdown(message.Content))</span>
 
-                            @if (message.EditedTimestamp != null)
+                            @if (message.EditedTimestamp is not null)
                             {
                                 <span class="chatlog__edited-timestamp" title="@FormatDate(message.EditedTimestamp.Value)">(edited)</span>
                             }
@@ -162,7 +162,7 @@
                 @foreach (var embed in message.Embeds)
                 {
                     <div class="chatlog__embed">
-                        @if (embed.Color != null)
+                        @if (embed.Color is not null)
                         {
                             var embedColorStyle = $"background-color: rgba({embed.Color?.R},{embed.Color?.G},{embed.Color?.B},{embed.Color?.A})";
                             <div class="chatlog__embed-color-pill" style="@embedColorStyle"></div>
@@ -175,7 +175,7 @@
                         <div class="chatlog__embed-content-container">
                             <div class="chatlog__embed-content">
                                 <div class="chatlog__embed-text">
-                                    @if (embed.Author != null)
+                                    @if (embed.Author is not null)
                                     {
                                         <div class="chatlog__embed-author">
                                             @if (!string.IsNullOrWhiteSpace(embed.Author.IconUrl))
@@ -249,7 +249,7 @@
                                     }
                                 </div>
 
-                                @if (embed.Thumbnail != null)
+                                @if (embed.Thumbnail is not null)
                                 {
                                     <div class="chatlog__embed-thumbnail-container">
                                         <a class="chatlog__embed-thumbnail-link" href="@await ResolveUrlAsync(embed.Thumbnail.Url)">
@@ -259,7 +259,7 @@
                                 }
                             </div>
 
-                            @if (embed.Image != null)
+                            @if (embed.Image is not null)
                             {
                                 <div class="chatlog__embed-image-container">
                                     <a class="chatlog__embed-image-link" href="@await ResolveUrlAsync(embed.Image.Url)">
@@ -268,7 +268,7 @@
                                 </div>
                             }
 
-                            @if (embed.Footer != null || embed.Timestamp != null)
+                            @if (embed.Footer is not null || embed.Timestamp is not null)
                             {
                                 <div class="chatlog__embed-footer">
                                     @if (!string.IsNullOrWhiteSpace(embed.Footer?.IconUrl))
@@ -282,12 +282,12 @@
                                             @embed.Footer.Text
                                         }
 
-                                        @if (!string.IsNullOrWhiteSpace(embed.Footer?.Text) && embed.Timestamp != null)
+                                        @if (!string.IsNullOrWhiteSpace(embed.Footer?.Text) && embed.Timestamp is not null)
                                         {
                                             @(" • ")
                                         }
 
-                                        @if (embed.Timestamp != null)
+                                        @if (embed.Timestamp is not null)
                                         {
                                             @FormatDate(embed.Timestamp.Value)
                                         }

DiscordChatExporter.Core/Exporting/Writers/Html/PreambleTemplate.cshtml

@@ -78,18 +78,18 @@
             <div class="preamble__entry preamble__entry--small">@Model.ExportContext.Request.Channel.Topic</div>
         }
 
-        @if (Model.ExportContext.Request.After != null || Model.ExportContext.Request.Before != null)
+        @if (Model.ExportContext.Request.After is not null || Model.ExportContext.Request.Before is not null)
         {
             <div class="preamble__entry preamble__entry--small">
-            @if (Model.ExportContext.Request.After != null && Model.ExportContext.Request.Before != null)
+            @if (Model.ExportContext.Request.After is not null && Model.ExportContext.Request.Before is not null)
             {
                 @($"Between {FormatDate(Model.ExportContext.Request.After.Value.ToDate())} and {FormatDate(Model.ExportContext.Request.Before.Value.ToDate())}")
             }
-            else if (Model.ExportContext.Request.After != null)
+            else if (Model.ExportContext.Request.After is not null)
             {
                 @($"After {FormatDate(Model.ExportContext.Request.After.Value.ToDate())}")
             }
-            else if (Model.ExportContext.Request.Before != null)
+            else if (Model.ExportContext.Request.Before is not null)
             {
                 @($"Before {FormatDate(Model.ExportContext.Request.Before.Value.ToDate())}")
             }

DiscordChatExporter.Core/Exporting/Writers/JsonMessageWriter.cs

@@ -118,19 +118,19 @@ namespace DiscordChatExporter.Core.Exporting.Writers
             _writer.WriteString("timestamp", embed.Timestamp);
             _writer.WriteString("description", FormatMarkdown(embed.Description));
 
-            if (embed.Color != null)
+            if (embed.Color is not null)
                 _writer.WriteString("color", embed.Color.Value.ToHex());
 
-            if (embed.Author != null)
+            if (embed.Author is not null)
                 await WriteEmbedAuthorAsync(embed.Author);
 
-            if (embed.Thumbnail != null)
+            if (embed.Thumbnail is not null)
                 await WriteEmbedThumbnailAsync(embed.Thumbnail);
 
-            if (embed.Image != null)
+            if (embed.Image is not null)
                 await WriteEmbedImageAsync(embed.Image);
 
-            if (embed.Footer != null)
+            if (embed.Footer is not null)
                 await WriteEmbedFooterAsync(embed.Footer);
 
             // Fields
@@ -266,7 +266,7 @@ namespace DiscordChatExporter.Core.Exporting.Writers
             _writer.WriteEndArray();
 
             // Message reference
-            if (message.Reference != null)
+            if (message.Reference is not null)
             {
                 _writer.WriteStartObject("reference");
                 _writer.WriteString("messageId", message.Reference.MessageId?.ToString());

DiscordChatExporter.Core/Exporting/Writers/MarkdownVisitors/HtmlMarkdownVisitor.cs

@@ -112,7 +112,7 @@ namespace DiscordChatExporter.Core.Exporting.Writers.MarkdownVisitors
                 var name = role?.Name ?? "deleted-role";
                 var color = role?.Color;
 
-                var style = color != null
+                var style = color is not null
                     ? $"color: rgb({color?.R}, {color?.G}, {color?.B}); background-color: rgba({color?.R}, {color?.G}, {color?.B}, 0.1);"
                     : "";
 

DiscordChatExporter.Core/Exporting/Writers/PlainTextMessageWriter.cs

@@ -118,10 +118,10 @@ namespace DiscordChatExporter.Core.Exporting.Writers
             if (!string.IsNullOrWhiteSpace(Context.Request.Channel.Topic))
                 await _writer.WriteLineAsync($"Topic: {Context.Request.Channel.Topic}");
 
-            if (Context.Request.After != null)
+            if (Context.Request.After is not null)
                 await _writer.WriteLineAsync($"After: {Context.FormatDate(Context.Request.After.Value.ToDate())}");
 
-            if (Context.Request.Before != null)
+            if (Context.Request.Before is not null)
                 await _writer.WriteLineAsync($"Before: {Context.FormatDate(Context.Request.Before.Value.ToDate())}");
 
             await _writer.WriteLineAsync('='.Repeat(62));

DiscordChatExporter.Core/Markdown/Matching/AggregateMatcher.cs

@@ -27,11 +27,11 @@ namespace DiscordChatExporter.Core.Markdown.Matching
                 var match = matcher.TryMatch(stringPart);
 
                 // If there's no match - continue
-                if (match == null)
+                if (match is null)
                     continue;
 
                 // If this match is earlier than previous earliest - replace
-                if (earliestMatch == null || match.StringPart.StartIndex < earliestMatch.StringPart.StartIndex)
+                if (earliestMatch is null || match.StringPart.StartIndex < earliestMatch.StringPart.StartIndex)
                     earliestMatch = match;
 
                 // If the earliest match starts at the very beginning - break,

DiscordChatExporter.Core/Markdown/Matching/IMatcher.cs

@@ -21,7 +21,7 @@ namespace DiscordChatExporter.Core.Markdown.Matching
                 var match = matcher.TryMatch(stringPart.Slice(currentIndex, stringPart.EndIndex - currentIndex));
 
                 // If there's no match - break
-                if (match == null)
+                if (match is null)
                     break;
 
                 // If this match doesn't start immediately at current index - transform and yield fallback first

DiscordChatExporter.Core/Utils/Http.cs

@@ -32,7 +32,7 @@ namespace DiscordChatExporter.Core.Utils
                             if (i > 3)
                             {
                                 var retryAfterDelay = result.Result.Headers.RetryAfter.Delta;
-                                if (retryAfterDelay != null)
+                                if (retryAfterDelay is not null)
                                     return retryAfterDelay.Value + TimeSpan.FromSeconds(1); // margin just in case
                             }
                         }

DiscordChatExporter.Gui/Behaviors/MultiSelectionListBoxBehavior.cs

@@ -20,7 +20,7 @@ namespace DiscordChatExporter.Gui.Behaviors
             var behavior = (MultiSelectionListBoxBehavior<T>) sender;
             if (behavior._modelHandled) return;
 
-            if (behavior.AssociatedObject == null)
+            if (behavior.AssociatedObject is null)
                 return;
 
             behavior._modelHandled = true;
@@ -43,7 +43,7 @@ namespace DiscordChatExporter.Gui.Behaviors
             _viewHandled = true;
 
             AssociatedObject.SelectedItems.Clear();
-            if (SelectedItems != null)
+            if (SelectedItems is not null)
             {
                 foreach (var item in SelectedItems)
                     AssociatedObject.SelectedItems.Add(item);
@@ -56,7 +56,7 @@ namespace DiscordChatExporter.Gui.Behaviors
         private void OnListBoxSelectionChanged(object sender, SelectionChangedEventArgs args)
         {
             if (_viewHandled) return;
-            if (AssociatedObject.Items.SourceCollection == null) return;
+            if (AssociatedObject.Items.SourceCollection is null) return;
 
             SelectedItems = AssociatedObject.SelectedItems.Cast<T>().ToArray();
         }
@@ -65,7 +65,7 @@ namespace DiscordChatExporter.Gui.Behaviors
         private void OnListBoxItemsChanged(object sender, NotifyCollectionChangedEventArgs args)
         {
             if (_viewHandled) return;
-            if (AssociatedObject.Items.SourceCollection == null) return;
+            if (AssociatedObject.Items.SourceCollection is null) return;
             SelectItems();
         }
 
@@ -82,7 +82,7 @@ namespace DiscordChatExporter.Gui.Behaviors
         {
             base.OnDetaching();
 
-            if (AssociatedObject != null)
+            if (AssociatedObject is not null)
             {
                 AssociatedObject.SelectionChanged -= OnListBoxSelectionChanged;
                 ((INotifyCollectionChanged) AssociatedObject.Items).CollectionChanged -= OnListBoxItemsChanged;

DiscordChatExporter.Gui/Services/UpdateService.cs

@@ -58,7 +58,7 @@ namespace DiscordChatExporter.Gui.Services
             if (!_settingsService.IsAutoUpdateEnabled)
                 return;
 
-            if (_updateVersion == null || !_updatePrepared || _updaterLaunched)
+            if (_updateVersion is null || !_updatePrepared || _updaterLaunched)
                 return;
 
             try

DiscordChatExporter.Gui/ViewModels/Dialogs/ExportSetupViewModel.cs

@@ -19,7 +19,7 @@ namespace DiscordChatExporter.Gui.ViewModels.Dialogs
 
         public IReadOnlyList<Channel>? Channels { get; set; }
 
-        public bool IsSingleChannel => Channels == null || Channels.Count == 1;
+        public bool IsSingleChannel => Channels is null || Channels.Count == 1;
 
         public string? OutputPath { get; set; }
 
@@ -32,7 +32,7 @@ namespace DiscordChatExporter.Gui.ViewModels.Dialogs
 
         public DateTimeOffset? AfterDate { get; set; }
 
-        public bool IsAfterDateSet => AfterDate != null;
+        public bool IsAfterDateSet => AfterDate is not null;
 
         public TimeSpan? AfterTime { get; set; }
 
@@ -40,7 +40,7 @@ namespace DiscordChatExporter.Gui.ViewModels.Dialogs
 
         public DateTimeOffset? BeforeDate { get; set; }
 
-        public bool IsBeforeDateSet => BeforeDate != null;
+        public bool IsBeforeDateSet => BeforeDate is not null;
 
         public TimeSpan? BeforeTime { get; set; }
 
@@ -77,7 +77,7 @@ namespace DiscordChatExporter.Gui.ViewModels.Dialogs
             _settingsService.LastShouldDownloadMedia = ShouldDownloadMedia;
 
             // If single channel - prompt file path
-            if (Channels != null && IsSingleChannel)
+            if (Channels is not null && IsSingleChannel)
             {
                 var channel = Channels.Single();
                 var defaultFileName = ExportRequest.GetDefaultOutputFileName(

DiscordChatExporter.Gui/ViewModels/RootViewModel.cs

@@ -44,7 +44,7 @@ namespace DiscordChatExporter.Gui.ViewModels
 
         public Guild? SelectedGuild { get; set; }
 
-        public IReadOnlyList<Channel>? AvailableChannels => SelectedGuild != null
+        public IReadOnlyList<Channel>? AvailableChannels => SelectedGuild is not null
             ? GuildChannelMap?[SelectedGuild]
             : null;
 
@@ -84,7 +84,7 @@ namespace DiscordChatExporter.Gui.ViewModels
             try
             {
                 var updateVersion = await _updateService.CheckForUpdatesAsync();
-                if (updateVersion == null)
+                if (updateVersion is null)
                     return;
 
                 Notifications.Enqueue($"Downloading update to {App.Name} v{updateVersion}...");
@@ -111,7 +111,7 @@ namespace DiscordChatExporter.Gui.ViewModels
 
             _settingsService.Load();
 
-            if (_settingsService.LastToken != null)
+            if (_settingsService.LastToken is not null)
             {
                 IsBotToken = _settingsService.LastToken.Type == AuthTokenType.Bot;
                 TokenValue = _settingsService.LastToken.Value;
@@ -183,12 +183,12 @@ namespace DiscordChatExporter.Gui.ViewModels
         }
 
         public bool CanExportChannels =>
-            !IsBusy && SelectedGuild != null && SelectedChannels != null && SelectedChannels.Any();
+            !IsBusy && SelectedGuild is not null && SelectedChannels is not null && SelectedChannels.Any();
 
         public async void ExportChannels()
         {
             var token = _settingsService.LastToken;
-            if (token == null || SelectedGuild == null || SelectedChannels == null || !SelectedChannels.Any())
+            if (token is null || SelectedGuild is null || SelectedChannels is null || !SelectedChannels.Any())
                 return;
 
             var dialog = _viewModelFactory.CreateExportSetupViewModel(SelectedGuild, SelectedChannels);