Try ReSharper EAP

.config/dotnet-tools.json

@@ -3,7 +3,7 @@
   "isRoot": true,
   "tools": {
     "jetbrains.resharper.globaltools": {
-      "version": "2025.3.4",
+      "version": "2026.1.0.1",
       "commands": [
         "jb"
       ],

src/Examples/DapperExample/TranslationToSql/Builders/SqlQueryBuilder.cs

@@ -452,7 +452,7 @@ private void AppendOnNewLine(string? value, StringBuilder builder)
                 builder.AppendLine();
             }
 
-            builder.Append(new string(' ', _indentDepth * 4));
+            builder.Append(' ', _indentDepth * 4);
             builder.Append(value);
         }
     }

src/JsonApiDotNetCore/AtomicOperations/Processors/AddToRelationshipProcessor.cs

@@ -26,7 +26,7 @@ public AddToRelationshipProcessor(IAddToRelationshipService<TResource, TId> serv
         var leftId = (TId)operation.Resource.GetTypedId();
         ISet<IIdentifiable> rightResourceIds = operation.GetSecondaryResources();
 
-        await _service.AddToToManyRelationshipAsync(leftId!, operation.Request.Relationship!.PublicName, rightResourceIds, cancellationToken);
+        await _service.AddToToManyRelationshipAsync(leftId, operation.Request.Relationship!.PublicName, rightResourceIds, cancellationToken);
 
         return null;
     }

src/JsonApiDotNetCore/AtomicOperations/Processors/DeleteProcessor.cs

@@ -24,10 +24,7 @@ public DeleteProcessor(IDeleteService<TResource, TId> service)
         ArgumentNullException.ThrowIfNull(operation);
 
         var id = (TId)operation.Resource.GetTypedId();
-#pragma warning disable CS8607 // A possible null value may not be used for a type marked with [NotNull] or [DisallowNull]
-        // Justification: Temporary workaround for R# bug at https://youtrack.jetbrains.com/issue/RSRP-503026.
         await _service.DeleteAsync(id, cancellationToken);
-#pragma warning restore CS8607 // A possible null value may not be used for a type marked with [NotNull] or [DisallowNull]
 
         return null;
     }

src/JsonApiDotNetCore/AtomicOperations/Processors/RemoveFromRelationshipProcessor.cs

@@ -26,7 +26,7 @@ public RemoveFromRelationshipProcessor(IRemoveFromRelationshipService<TResource,
         var leftId = (TId)operation.Resource.GetTypedId();
         ISet<IIdentifiable> rightResourceIds = operation.GetSecondaryResources();
 
-        await _service.RemoveFromToManyRelationshipAsync(leftId!, operation.Request.Relationship!.PublicName, rightResourceIds, cancellationToken);
+        await _service.RemoveFromToManyRelationshipAsync(leftId, operation.Request.Relationship!.PublicName, rightResourceIds, cancellationToken);
 
         return null;
     }

src/JsonApiDotNetCore/AtomicOperations/Processors/SetRelationshipProcessor.cs

@@ -27,7 +27,7 @@ public SetRelationshipProcessor(ISetRelationshipService<TResource, TId> service)
         var leftId = (TId)operation.Resource.GetTypedId();
         object? rightValue = GetRelationshipRightValue(operation);
 
-        await _service.SetRelationshipAsync(leftId!, operation.Request.Relationship!.PublicName, rightValue, cancellationToken);
+        await _service.SetRelationshipAsync(leftId, operation.Request.Relationship!.PublicName, rightValue, cancellationToken);
 
         return null;
     }

src/JsonApiDotNetCore/Diagnostics/CascadingCodeTimer.cs

@@ -263,7 +263,7 @@ private void WriteResult(StringBuilder builder, int indent, TimeSpan timeElapsed
 
         private static void WriteIndent(StringBuilder builder, int indent)
         {
-            builder.Append(new string(' ', indent * 2));
+            builder.Append(' ', indent * 2);
         }
 
         private void WritePadding(StringBuilder builder, int indent, int paddingLength)

src/JsonApiDotNetCore/Middleware/JsonApiMiddleware.cs

@@ -98,7 +98,7 @@ public async Task InvokeAsync(HttpContext httpContext, IJsonApiRequest request)
         if (CodeTimingSessionManager.IsEnabled && _logger.IsEnabled(LogLevel.Information))
         {
             string timingResults = CodeTimingSessionManager.Current.GetResults();
-            string requestMethod = httpContext.Request.Method.Replace(Environment.NewLine, "");
+            string requestMethod = httpContext.Request.Method.Replace(Environment.NewLine, string.Empty);
             string requestUrl = httpContext.Request.GetEncodedUrl();
             LogMeasurement(requestMethod, requestUrl, Environment.NewLine, timingResults);
         }

src/JsonApiDotNetCore/Queries/Expressions/SortExpression.cs

@@ -48,7 +48,7 @@ public override string ToString()
 
     public override string ToFullString()
     {
-        return $"{string.Join(',', Elements.Select(child => child.ToFullString()))}{(IsAutoGenerated ? " (auto-generated)" : "")}";
+        return $"{string.Join(',', Elements.Select(child => child.ToFullString()))}{(IsAutoGenerated ? " (auto-generated)" : string.Empty)}";
     }
 
     public override bool Equals(object? obj)

src/JsonApiDotNetCore/Queries/IndentingStringWriter.cs

@@ -12,7 +12,7 @@ public void WriteLine(string? line)
     {
         if (_indentDepth > 0)
         {
-            _builder.Append(new string(' ', _indentDepth * 2));
+            _builder.Append(' ', _indentDepth * 2);
         }
 
         _builder.AppendLine(line);

src/JsonApiDotNetCore/Serialization/Request/JsonApiReader.cs

@@ -42,7 +42,7 @@ public JsonApiReader(IJsonApiOptions options, IDocumentAdapter documentAdapter,
 
         if (_logger.IsEnabled(LogLevel.Trace))
         {
-            string requestMethod = httpRequest.Method.Replace(Environment.NewLine, "");
+            string requestMethod = httpRequest.Method.Replace(Environment.NewLine, string.Empty);
             string requestUrl = httpRequest.GetEncodedUrl();
             LogRequest(requestMethod, requestUrl, requestBody);
         }

src/JsonApiDotNetCore/Serialization/Response/JsonApiWriter.cs

@@ -65,7 +65,7 @@ public async Task WriteAsync(object? model, HttpContext httpContext)
 
         if (_logger.IsEnabled(LogLevel.Trace))
         {
-            string requestMethod = httpContext.Request.Method.Replace(Environment.NewLine, "");
+            string requestMethod = httpContext.Request.Method.Replace(Environment.NewLine, string.Empty);
             string requestUrl = httpContext.Request.GetEncodedUrl();
             LogResponse(requestMethod, requestUrl, responseBody, httpContext.Response.StatusCode);
         }

test/DiscoveryTests/ServiceDiscoveryFacadeTests.cs

@@ -29,7 +29,7 @@ public void Can_add_resources_from_assembly_to_graph()
         Action<ServiceDiscoveryFacade> addAction = facade => facade.AddAssembly(typeof(Person).Assembly);
 
         // Act
-        _services.AddJsonApi(discovery: facade => addAction(facade));
+        _services.AddJsonApi(discovery: addAction);
 
         // Assert
         ServiceProvider serviceProvider = _services.BuildServiceProvider();
@@ -49,7 +49,7 @@ public void Can_add_resource_from_current_assembly_to_graph()
         Action<ServiceDiscoveryFacade> addAction = facade => facade.AddCurrentAssembly();
 
         // Act
-        _services.AddJsonApi(discovery: facade => addAction(facade));
+        _services.AddJsonApi(discovery: addAction);
 
         // Assert
         ServiceProvider serviceProvider = _services.BuildServiceProvider();
@@ -66,7 +66,7 @@ public void Can_add_resource_service_from_current_assembly_to_container()
         Action<ServiceDiscoveryFacade> addAction = facade => facade.AddCurrentAssembly();
 
         // Act
-        _services.AddJsonApi(discovery: facade => addAction(facade));
+        _services.AddJsonApi(discovery: addAction);
 
         // Assert
         ServiceProvider serviceProvider = _services.BuildServiceProvider();
@@ -82,7 +82,7 @@ public void Can_add_resource_repository_from_current_assembly_to_container()
         Action<ServiceDiscoveryFacade> addAction = facade => facade.AddCurrentAssembly();
 
         // Act
-        _services.AddJsonApi(discovery: facade => addAction(facade));
+        _services.AddJsonApi(discovery: addAction);
 
         // Assert
         ServiceProvider serviceProvider = _services.BuildServiceProvider();
@@ -98,7 +98,7 @@ public void Can_add_resource_definition_from_current_assembly_to_container()
         Action<ServiceDiscoveryFacade> addAction = facade => facade.AddCurrentAssembly();
 
         // Act
-        _services.AddJsonApi(discovery: facade => addAction(facade));
+        _services.AddJsonApi(discovery: addAction);
 
         // Assert
         ServiceProvider serviceProvider = _services.BuildServiceProvider();

test/JsonApiDotNetCoreTests/IntegrationTests/QueryStrings/Sorting/SortTests.cs

@@ -312,10 +312,10 @@ public async Task Can_sort_on_multiple_fields_in_multiple_scopes()
         blogs[0].Posts[1].Caption = "A";
         blogs[0].Posts[2].Caption = "A";
         blogs[0].Posts[3].Caption = "C";
-        blogs[0].Posts[0].Url = "";
+        blogs[0].Posts[0].Url = string.Empty;
         blogs[0].Posts[1].Url = "www.some2.com";
         blogs[0].Posts[2].Url = "www.some1.com";
-        blogs[0].Posts[3].Url = "";
+        blogs[0].Posts[3].Url = string.Empty;
 
         blogs[0].Posts[0].Comments = _fakers.Comment.GenerateSet(3);
         blogs[0].Posts[0].Comments.ElementAt(0).CreatedAt = 1.January(2015).AsUtc();

test/JsonApiDotNetCoreTests/UnitTests/QueryStringParameters/PaginationParseTests.cs

@@ -182,7 +182,7 @@ public void Reader_Read_Pagination_Succeeds(string? pageNumber, string? pageSize
         ResourceFieldChainExpression?[] scopeTrees = constraints.Select(expressionInScope => expressionInScope.Scope).ToArray();
 
         scopeTrees.Should().HaveSameCount(scopeTreesExpectedArray);
-        scopeTrees.Select(tree => tree?.ToString() ?? "").Should().BeEquivalentTo(scopeTreesExpectedArray, options => options.WithStrictOrdering());
+        scopeTrees.Select(tree => tree?.ToString() ?? string.Empty).Should().BeEquivalentTo(scopeTreesExpectedArray, options => options.WithStrictOrdering());
 
         string[] valueTreesExpectedArray = valueTreesExpected.Split("|");
         QueryExpression[] valueTrees = constraints.Select(expressionInScope => expressionInScope.Expression).ToArray();

test/TestBuildingBlocks/XUnitLoggerProvider.cs

@@ -145,7 +145,7 @@ private static string GetLogLevelString(LogLevel logLevel)
                 LogLevel.Warning => "WARN",
                 LogLevel.Error => "FAIL",
                 LogLevel.Critical => "CRIT",
-                LogLevel.None => "",
+                LogLevel.None => string.Empty,
                 _ => throw new ArgumentOutOfRangeException(nameof(logLevel))
             };
         }