dotnet · YuliiaKovalova · Feb 3, 2026 · Jan 30, 2026 · Jan 30, 2026 · Jan 30, 2026
diff --git a/src/Build/BackEnd/Components/BuildRequestEngine/BuildRequestConfigurationResponse.cs b/src/Build/BackEnd/Components/BuildRequestEngine/BuildRequestConfigurationResponse.cs
@@ -1,8 +1,6 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
-#nullable disable
-
 namespace Microsoft.Build.BackEnd
 {
     /// <summary>

diff --git a/src/Build/BackEnd/Components/Caching/RegisteredTaskObjectCache.cs b/src/Build/BackEnd/Components/Caching/RegisteredTaskObjectCache.cs
@@ -5,8 +5,6 @@
 using Microsoft.Build.Framework;
 using Microsoft.Build.Shared;
 
-#nullable disable
-
 namespace Microsoft.Build.BackEnd.Components.Caching
 {
     /// <summary>

diff --git a/src/Build/BackEnd/Components/Caching/ResultsCacheWithOverride.cs b/src/Build/BackEnd/Components/Caching/ResultsCacheWithOverride.cs
@@ -6,16 +6,13 @@
 using Microsoft.Build.BackEnd;
 using Microsoft.Build.Shared;
 
-#nullable disable
-
 namespace Microsoft.Build.Execution
 {
     internal class ResultsCacheWithOverride : IResultsCache
     {
         private readonly IResultsCache _override;
         public ResultsCache CurrentCache { get; }
 
-
         public ResultsCacheWithOverride(IResultsCache @override)
         {
             _override = @override;

diff --git a/src/Build/BackEnd/Components/Communications/NodeInfo.cs b/src/Build/BackEnd/Components/Communications/NodeInfo.cs
@@ -5,8 +5,6 @@
 
 using Microsoft.Build.Execution;
 
-#nullable disable
-
 namespace Microsoft.Build.BackEnd
 {
     /// <summary>

diff --git a/src/Build/BackEnd/Components/Logging/BuildLoggingContext.cs b/src/Build/BackEnd/Components/Logging/BuildLoggingContext.cs
@@ -6,8 +6,6 @@
 using Microsoft.Build.Framework;
 using Microsoft.Build.Shared;
 
-#nullable disable
-
 namespace Microsoft.Build.BackEnd.Logging
 {
     /// <summary>

diff --git a/src/Build/BackEnd/Components/Logging/EvaluationLoggingContext.cs b/src/Build/BackEnd/Components/Logging/EvaluationLoggingContext.cs
@@ -8,8 +8,6 @@
 using Microsoft.Build.Framework.Profiler;
 using Microsoft.Build.Shared;
 
-#nullable disable
-
 namespace Microsoft.Build.BackEnd.Components.Logging
 {
     /// <summary>

diff --git a/src/Build/BackEnd/Components/Logging/EventRedirectorToSink.cs b/src/Build/BackEnd/Components/Logging/EventRedirectorToSink.cs
@@ -4,8 +4,6 @@
 using Microsoft.Build.Framework;
 using Microsoft.Build.Shared;
 
-#nullable disable
-
 namespace Microsoft.Build.BackEnd.Logging
 {
     /// <summary>

diff --git a/src/Build/BackEnd/Components/Logging/ForwardingLoggerRecord.cs b/src/Build/BackEnd/Components/Logging/ForwardingLoggerRecord.cs
@@ -4,8 +4,6 @@
 using Microsoft.Build.Framework;
 using Microsoft.Build.Shared;
 
-#nullable disable
-
 namespace Microsoft.Build.Logging
 {
     /// <summary>

diff --git a/src/Build/BackEnd/Components/Logging/LoggingServiceFactory.cs b/src/Build/BackEnd/Components/Logging/LoggingServiceFactory.cs
@@ -3,8 +3,6 @@
 
 using Microsoft.Build.Shared;
 
-#nullable disable
-
 namespace Microsoft.Build.BackEnd.Logging
 {
     /// <summary>

diff --git a/src/Build/BackEnd/Components/Scheduler/ScheduleTimeRecord.cs b/src/Build/BackEnd/Components/Scheduler/ScheduleTimeRecord.cs
@@ -4,8 +4,6 @@
 using System;
 using Microsoft.Build.Shared;
 
-#nullable disable
-
 namespace Microsoft.Build.BackEnd
 {
     /// <summary>

diff --git a/src/Build/BackEnd/Components/SdkResolution/DefaultSdkResolver.cs b/src/Build/BackEnd/Components/SdkResolution/DefaultSdkResolver.cs
@@ -9,8 +9,6 @@
 using SdkResultBase = Microsoft.Build.Framework.SdkResult;
 using SdkResultFactoryBase = Microsoft.Build.Framework.SdkResultFactory;
 
-#nullable disable
-
 namespace Microsoft.Build.BackEnd.SdkResolution
 {
     /// <summary>

diff --git a/src/Build/BackEnd/Components/SdkResolution/OutOfProcNodeSdkResolverServiceFactory.cs b/src/Build/BackEnd/Components/SdkResolution/OutOfProcNodeSdkResolverServiceFactory.cs
@@ -3,8 +3,6 @@
 
 using System;
 
-#nullable disable
-
 namespace Microsoft.Build.BackEnd.SdkResolution
 {
     /// <summary>

diff --git a/src/Build/BackEnd/Components/SdkResolution/SdkLogger.cs b/src/Build/BackEnd/Components/SdkResolution/SdkLogger.cs
@@ -6,8 +6,6 @@
 
 using SdkLoggerBase = Microsoft.Build.Framework.SdkLogger;
 
-#nullable disable
-
 namespace Microsoft.Build.BackEnd.SdkResolution
 {
     /// <summary>

diff --git a/src/Build/BackEnd/Components/SdkResolution/SdkResolverCachingWrapper.cs b/src/Build/BackEnd/Components/SdkResolution/SdkResolverCachingWrapper.cs
@@ -10,8 +10,6 @@
 using Microsoft.Build.Shared;
 using Microsoft.Build.Utilities;
 
-#nullable disable
-
 namespace Microsoft.Build.BackEnd.SdkResolution
 {
 

diff --git a/src/Build/BackEnd/Components/SdkResolution/SdkResolverContext.cs b/src/Build/BackEnd/Components/SdkResolution/SdkResolverContext.cs
@@ -5,8 +5,6 @@
 
 using SdkResolverContextBase = Microsoft.Build.Framework.SdkResolverContext;
 
-#nullable disable
-
 namespace Microsoft.Build.BackEnd.SdkResolution
 {
     /// <summary>

diff --git a/src/Build/BackEnd/Node/LoggingNodeConfiguration.cs b/src/Build/BackEnd/Node/LoggingNodeConfiguration.cs
@@ -1,8 +1,6 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
-#nullable disable
-
 namespace Microsoft.Build.BackEnd
 {
     internal sealed class LoggingNodeConfiguration : ITranslatable

diff --git a/src/Build/BackEnd/Node/NativeMethods.cs b/src/Build/BackEnd/Node/NativeMethods.cs
@@ -4,8 +4,6 @@
 using System;
 using System.Runtime.InteropServices;
 
-#nullable disable
-
 namespace Microsoft.Build.BackEnd
 {
     /// <summary>

diff --git a/src/Build/BackEnd/Shared/ResourceRequest.cs b/src/Build/BackEnd/Shared/ResourceRequest.cs
@@ -1,8 +1,6 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
-#nullable disable
-
 namespace Microsoft.Build.BackEnd
 {
     /// <summary>

diff --git a/src/Build/BackEnd/Shared/ResourceResponse.cs b/src/Build/BackEnd/Shared/ResourceResponse.cs
@@ -1,8 +1,6 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
-#nullable disable
-
 namespace Microsoft.Build.BackEnd
 {
     /// <summary>

diff --git a/src/Build/Collections/CopyOnReadEnumerable.cs b/src/Build/Collections/CopyOnReadEnumerable.cs
@@ -7,8 +7,6 @@
 using System.Linq;
 using Microsoft.Build.Shared;
 
-#nullable disable
-
 namespace Microsoft.Build.Collections
 {
     /// <summary>

diff --git a/src/Build/Collections/HashTableUtility.cs b/src/Build/Collections/HashTableUtility.cs
@@ -4,8 +4,6 @@
 using System;
 using System.Collections.Generic;
 
-#nullable disable
-
 namespace Microsoft.Build.Collections
 {
     /// <summary>

diff --git a/src/Build/Collections/RetrievableEntryHashSet/HashHelpers.cs b/src/Build/Collections/RetrievableEntryHashSet/HashHelpers.cs
@@ -9,8 +9,6 @@
 #endif
 #endif
 
-#nullable disable
-
 namespace Microsoft.Build.Collections
 {
     /// <summary>

diff --git a/src/Build/Collections/RetrievableEntryHashSet/HashSetDebugView.cs b/src/Build/Collections/RetrievableEntryHashSet/HashSetDebugView.cs
@@ -4,8 +4,6 @@
 using System;
 using System.Diagnostics;
 
-#nullable disable
-
 namespace Microsoft.Build.Collections
 {
     /// <summary>

diff --git a/src/Build/Construction/Solution/ProjectConfigurationInSolution.cs b/src/Build/Construction/Solution/ProjectConfigurationInSolution.cs
@@ -3,8 +3,6 @@
 
 using System;
 
-#nullable disable
-
 namespace Microsoft.Build.Construction
 {
     /// <summary>

diff --git a/src/Build/Construction/Solution/SolutionConfigurationInSolution.cs b/src/Build/Construction/Solution/SolutionConfigurationInSolution.cs
@@ -1,8 +1,6 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
-#nullable disable
-
 namespace Microsoft.Build.Construction
 {
     /// <summary>

diff --git a/src/Build/Definition/BuiltInMetadata.cs b/src/Build/Definition/BuiltInMetadata.cs
@@ -6,8 +6,6 @@
 using System.Diagnostics;
 using Microsoft.Build.Shared;
 
-#nullable disable
-
 namespace Microsoft.Build.Evaluation
 {
     /// <summary>

diff --git a/src/Build/Definition/NewProjectFileOptions.cs b/src/Build/Definition/NewProjectFileOptions.cs
@@ -3,8 +3,6 @@
 
 using System;
 
-#nullable disable
-
 namespace Microsoft.Build.Evaluation
 {
     /// <summary>

diff --git a/src/Build/Definition/ProjectCollectionChangedEventArgs.cs b/src/Build/Definition/ProjectCollectionChangedEventArgs.cs
@@ -3,8 +3,6 @@
 
 using System;
 
-#nullable disable
-
 namespace Microsoft.Build.Evaluation
 {
     /// <summary>

diff --git a/src/Build/Definition/ProjectLoadSettings.cs b/src/Build/Definition/ProjectLoadSettings.cs
@@ -4,8 +4,6 @@
 using System;
 using System.Diagnostics.CodeAnalysis;
 
-#nullable disable
-
 namespace Microsoft.Build.Evaluation
 {
     /// <summary>

diff --git a/src/Build/Definition/ResolvedImport.cs b/src/Build/Definition/ResolvedImport.cs
@@ -6,8 +6,6 @@
 using Microsoft.Build.Framework;
 using Microsoft.Build.Shared;
 
-#nullable disable
-
 namespace Microsoft.Build.Evaluation
 {
     /// <summary>

diff --git a/src/Build/Definition/ToolsetLocalReader.cs b/src/Build/Definition/ToolsetLocalReader.cs
@@ -7,8 +7,6 @@
 using Microsoft.Build.Execution;
 using Microsoft.Build.Shared;
 
-#nullable disable
-
 namespace Microsoft.Build.Evaluation
 {
     internal class ToolsetLocalReader : ToolsetReader

diff --git a/src/Build/Definition/ToolsetPropertyDefinition.cs b/src/Build/Definition/ToolsetPropertyDefinition.cs
@@ -5,8 +5,6 @@
 using Microsoft.Build.Shared;
 using ErrorUtilities = Microsoft.Build.Shared.ErrorUtilities;
 
-#nullable disable
-
 namespace Microsoft.Build.Evaluation
 {
     /// <summary>

diff --git a/src/Build/Evaluation/Conditionals/AndExpressionNode.cs b/src/Build/Evaluation/Conditionals/AndExpressionNode.cs
@@ -4,8 +4,6 @@
 using System.Diagnostics;
 using Microsoft.Build.Shared;
 
-#nullable disable
-
 namespace Microsoft.Build.Evaluation
 {
     /// <summary>

diff --git a/src/Build/Evaluation/Conditionals/CharacterUtilities.cs b/src/Build/Evaluation/Conditionals/CharacterUtilities.cs
@@ -1,8 +1,6 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
-#nullable disable
-
 namespace Microsoft.Build.Evaluation
 {
     internal static class CharacterUtilities

diff --git a/src/Build/Evaluation/Conditionals/EqualExpressionNode.cs b/src/Build/Evaluation/Conditionals/EqualExpressionNode.cs
@@ -4,8 +4,6 @@
 using System;
 using System.Diagnostics;
 
-#nullable disable
-
 namespace Microsoft.Build.Evaluation
 {
     /// <summary>

diff --git a/src/Build/Evaluation/Conditionals/GreaterThanExpressionNode.cs b/src/Build/Evaluation/Conditionals/GreaterThanExpressionNode.cs
@@ -4,8 +4,6 @@
 using System;
 using System.Diagnostics;
 
-#nullable disable
-
 namespace Microsoft.Build.Evaluation
 {
     /// <summary>

diff --git a/src/Build/Evaluation/Conditionals/GreaterThanOrEqualExpressionNode.cs b/src/Build/Evaluation/Conditionals/GreaterThanOrEqualExpressionNode.cs
@@ -4,8 +4,6 @@
 using System;
 using System.Diagnostics;
 
-#nullable disable
-
 namespace Microsoft.Build.Evaluation
 {
     /// <summary>

diff --git a/src/Build/Evaluation/Conditionals/LessThanExpressionNode.cs b/src/Build/Evaluation/Conditionals/LessThanExpressionNode.cs
@@ -4,8 +4,6 @@
 using System;
 using System.Diagnostics;
 
-#nullable disable
-
 namespace Microsoft.Build.Evaluation
 {
     /// <summary>

diff --git a/src/Build/Evaluation/Conditionals/LessThanOrEqualExpressionNode.cs b/src/Build/Evaluation/Conditionals/LessThanOrEqualExpressionNode.cs
@@ -4,8 +4,6 @@
 using System;
 using System.Diagnostics;
 
-#nullable disable
-
 namespace Microsoft.Build.Evaluation
 {
     /// <summary>

diff --git a/src/Build/Evaluation/Conditionals/NotEqualExpressionNode.cs b/src/Build/Evaluation/Conditionals/NotEqualExpressionNode.cs
@@ -4,8 +4,6 @@
 using System;
 using System.Diagnostics;
 
-#nullable disable
-
 namespace Microsoft.Build.Evaluation
 {
     /// <summary>

diff --git a/src/Build/Evaluation/Conditionals/NotExpressionNode.cs b/src/Build/Evaluation/Conditionals/NotExpressionNode.cs
@@ -4,8 +4,6 @@
 using System.Diagnostics;
 using Microsoft.Build.Shared;
 
-#nullable disable
-
 namespace Microsoft.Build.Evaluation
 {
     /// <summary>

diff --git a/src/Build/Evaluation/Conditionals/NumericComparisonExpressionNode.cs b/src/Build/Evaluation/Conditionals/NumericComparisonExpressionNode.cs
@@ -4,8 +4,6 @@
 using System;
 using Microsoft.Build.Shared;
 
-#nullable disable
-
 namespace Microsoft.Build.Evaluation
 {
     /// <summary>

diff --git a/src/Build/Evaluation/Conditionals/OperandExpressionNode.cs b/src/Build/Evaluation/Conditionals/OperandExpressionNode.cs
@@ -1,8 +1,6 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
-#nullable disable
-
 namespace Microsoft.Build.Evaluation
 {
     /// <summary>
-Original file line number
+Diff line change
@@ Expand Up / @@ -9,8 +9,6 @@ @@
     #endif
     #endif
-    #nullable disable
     namespace Microsoft.Build.Collections
     {
         /// <summary>
@@ Expand Down @@