.gitignore

@@ -261,6 +261,5 @@ paket-files/
 __pycache__/
 *.pyc
 
-/.cursor
+
-/.vscode
 /staging

CHANGELOG.md

@@ -1,23 +1,10 @@
-# Changelog
+# Changelog
 
 All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## v1.6.5 - 2026-02-02
-
-### Changed
-- Replaced explicit `ArgumentNullException` throws with `ArgumentNullException.ThrowIfNull` in `ExpressionExtensions`, `NetworkConnection`, `Base32Encoder`, `StringExtensions.CSVToDataTable`, `FileLoggerProvider`, and `JsonFileLoggerProvider`.
-- **Base32Encoder**: empty input now throws `ArgumentException` instead of `ArgumentNullException` for clearer semantics.
-- **StringExtensions.CSVToDataTable**: null file path throws via `ThrowIfNull`; empty/whitespace path throws `ArgumentException`.
-- **ObjectExtensions**: `DeepClone` returns `default` for null input; `DeepEqual` explicitly treats (null, null) as true and (null, non-null) as false. Replaced obsolete `FormatterServices.GetUninitializedObject` with `RuntimeHelpers.GetUninitializedObject`. Fixed nullability in `ReferenceEqualityComparer` to match `IEqualityComparer<object>`.
-- **TotpGenerator**: recovery code generation uses range syntax (`code[..4]`, `code[4..8]`) instead of `Substring`.
-
-### Fixed
-- **ExceptionExtensions.ExtractMessages**: null check added to avoid `NullReferenceException` when passed null.
-- **BaseFileLogger.RemoveExpiredLogFiles**: guard added before `Substring(4)` so malformed log file names do not throw.
-
 ## v1.6.4 - 2026-02-21
 
 ### Added

CONTRIBUTING.md

@@ -46,14 +46,7 @@ This project uses the following commit message format:
 | `(feature):` | New feature or enhancement |
 | `(bugfix):` | Bug fix |
 | `(refactor):` | Code refactoring without functional changes |
-| `(perf):` | Performance improvement without changing behavior |
+| `(chore):` | Maintenance tasks (dependencies, CI, documentation) |
-| `(test):` | Add or update tests |
-| `(docs):` | Documentation-only changes |
-| `(build):` | Build system, dependencies, packaging, or project file changes |
-| `(ci):` | CI/CD pipeline or automation changes |
-| `(style):` | Formatting or non-functional code style changes |
-| `(revert):` | Revert a previous commit |
-| `(chore):` | General maintenance tasks that do not fit the types above |
 
 ### Examples
 
@@ -61,13 +54,6 @@ This project uses the following commit message format:
 (feature): add support for custom JWT claims
 (bugfix): fix multithreading issue in file logger
 (refactor): simplify expression extension methods
-(perf): reduce allocations in Base32 encoder
-(test): add coverage for IQueryable predicate composition
-(docs): clarify release workflow prerequisites
-(build): update package metadata in MaksIT.Core.csproj
-(ci): update GitHub Actions workflow for .NET 10
-(style): normalize using directives in extension tests
-(revert): revert breaking change in network connection handling
 (chore): update copyright year to 2026
 ```
 

assets/badges/coverage-branches.svg

@@ -1,5 +1,5 @@
-<svg xmlns="http://www.w3.org/2000/svg" width="150" height="20" role="img" aria-label="Branch Coverage: 50.3%">
+<svg xmlns="http://www.w3.org/2000/svg" width="150" height="20" role="img" aria-label="Branch Coverage: 49.6%">
-  <title>Branch Coverage: 50.3%</title>
+  <title>Branch Coverage: 49.6%</title>
   <linearGradient id="s" x2="0" y2="100%">
     <stop offset="0" stop-color="#bbb" stop-opacity=".1"/>
     <stop offset="1" stop-opacity=".1"/>
@@ -15,7 +15,7 @@
   <g fill="#fff" text-anchor="middle" font-family="Verdana,Geneva,DejaVu Sans,sans-serif" text-rendering="geometricPrecision" font-size="11">
     <text aria-hidden="true" x="53.75" y="15" fill="#010101" fill-opacity=".3">Branch Coverage</text>
     <text x="53.75" y="14" fill="#fff">Branch Coverage</text>
-    <text aria-hidden="true" x="128.75" y="15" fill="#010101" fill-opacity=".3">50.3%</text>
+    <text aria-hidden="true" x="128.75" y="15" fill="#010101" fill-opacity=".3">49.6%</text>
-    <text x="128.75" y="14" fill="#fff">50.3%</text>
+    <text x="128.75" y="14" fill="#fff">49.6%</text>
   </g>
 </svg>

assets/badges/coverage-lines.svg

@@ -1,21 +1,21 @@
-<svg xmlns="http://www.w3.org/2000/svg" width="137" height="20" role="img" aria-label="Line Coverage: 60.1%">
+<svg xmlns="http://www.w3.org/2000/svg" width="134.5" height="20" role="img" aria-label="Line Coverage: 60%">
-  <title>Line Coverage: 60.1%</title>
+  <title>Line Coverage: 60%</title>
   <linearGradient id="s" x2="0" y2="100%">
     <stop offset="0" stop-color="#bbb" stop-opacity=".1"/>
     <stop offset="1" stop-opacity=".1"/>
   </linearGradient>
   <clipPath id="r">
-    <rect width="137" height="20" rx="3" fill="#fff"/>
+    <rect width="134.5" height="20" rx="3" fill="#fff"/>
   </clipPath>
   <g clip-path="url(#r)">
     <rect width="94.5" height="20" fill="#555"/>
-    <rect x="94.5" width="42.5" height="20" fill="#97ca00"/>
+    <rect x="94.5" width="40" height="20" fill="#97ca00"/>
-    <rect width="137" height="20" fill="url(#s)"/>
+    <rect width="134.5" height="20" fill="url(#s)"/>
   </g>
   <g fill="#fff" text-anchor="middle" font-family="Verdana,Geneva,DejaVu Sans,sans-serif" text-rendering="geometricPrecision" font-size="11">
     <text aria-hidden="true" x="47.25" y="15" fill="#010101" fill-opacity=".3">Line Coverage</text>
     <text x="47.25" y="14" fill="#fff">Line Coverage</text>
-    <text aria-hidden="true" x="115.75" y="15" fill="#010101" fill-opacity=".3">60.1%</text>
+    <text aria-hidden="true" x="114.5" y="15" fill="#010101" fill-opacity=".3">60%</text>
-    <text x="115.75" y="14" fill="#fff">60.1%</text>
+    <text x="114.5" y="14" fill="#fff">60%</text>
   </g>
 </svg>

src/MaksIT.Core.Tests/Extensions/ExceptionExtensionsTests.cs

@@ -77,10 +77,4 @@ public class ExceptionExtensionsTests {
     Assert.Single(messages);
     Assert.Equal("", messages[0]);
   }
-
-  [Fact]
-  public void ExtractMessages_WhenNull_ThrowsArgumentNullException() {
-    Exception? exception = null;
-    Assert.Throws<ArgumentNullException>(() => exception!.ExtractMessages());
-  }
 }

src/MaksIT.Core.Tests/Extensions/ExpressionExtensionsTests.cs

@@ -1,5 +1,4 @@
-using System.Linq;
+using System.Linq.Expressions;
-using System.Linq.Expressions;
 
 using MaksIT.Core.Extensions;
 
@@ -24,28 +23,6 @@ public class ExpressionExtensionsTests {
     Assert.False(compiledPredicate(new TestEntity { Age = 20, Name = "Bob" }));
   }
 
-  /// <summary>
-  /// Ensures AndAlso produces an expression that works with IQueryable.Where (as used by EF Core).
-  /// </summary>
-  [Fact]
-  public void AndAlso_ShouldWorkWithIQueryableWhere() {
-    var source = new List<TestEntity> {
-      new() { Age = 20, Name = "Alice" },
-      new() { Age = 17, Name = "Alice" },
-      new() { Age = 20, Name = "Bob" },
-      new() { Age = 25, Name = "Amy" }
-    };
-    Expression<Func<TestEntity, bool>> first = x => x.Age > 18;
-    Expression<Func<TestEntity, bool>> second = x => (x.Name ?? "").StartsWith("A");
-    var combined = first.AndAlso(second);
-
-    var result = source.AsQueryable().Where(combined).ToList();
-
-    Assert.Equal(2, result.Count);
-    Assert.Contains(result, e => e.Name == "Alice" && e.Age == 20);
-    Assert.Contains(result, e => e.Name == "Amy" && e.Age == 25);
-  }
-
   [Fact]
   public void OrElse_ShouldCombineTwoPredicatesWithOrCondition() {
     // Arrange

src/MaksIT.Core.Tests/Extensions/ObjectExtensionsTests.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Text.Json;
 using System.Text.Json.Serialization;
@@ -235,13 +235,6 @@ namespace MaksIT.Core.Tests.Extensions {
       Assert.Same(s, s2);
     }
 
-    [Fact]
-    public void DeepClone_WhenNull_ReturnsDefault() {
-      Person? source = null;
-      var result = source.DeepClone();
-      Assert.Null(result);
-    }
-
     [Fact]
     public void DeepEqual_ShouldReturnTrue_ForEqualGraphs() {
       // Arrange

src/MaksIT.Core/Extensions/ExceptionExtensions.cs

@@ -1,4 +1,4 @@
-namespace MaksIT.Core.Extensions;
+namespace MaksIT.Core.Extensions;
 
 public static class ExceptionExtensions {
   /// <summary>
@@ -7,7 +7,6 @@ public static class ExceptionExtensions {
   /// <param name="exception">The exception to extract messages from.</param>
   /// <returns>A list of exception messages.</returns>
   public static List<string> ExtractMessages(this Exception exception) {
-    ArgumentNullException.ThrowIfNull(exception);
     var messages = new List<string>();
     var current = exception;
 

src/MaksIT.Core/Extensions/ExpressionExtensions.cs

@@ -1,19 +1,10 @@
-using System.Linq.Expressions;
+using System.Linq.Expressions;
 
 
 namespace MaksIT.Core.Extensions;
 
-/// <summary>
-/// Extension methods for combining and negating expression predicates.
-/// AndAlso and OrElse use parameter replacement (no Expression.Invoke), so the result
-/// is safe for use with IQueryable and EF Core (translatable to SQL).
-/// </summary>
 public static class ExpressionExtensions {
 
-  /// <summary>
-  /// Combines two predicates with AND. Uses a single parameter and Expression.AndAlso;
-  /// safe for IQueryable/EF Core (no Invoke).
-  /// </summary>
   public static Expression<Func<T, bool>> AndAlso<T>(this Expression<Func<T, bool>> first, Expression<Func<T, bool>> second) {
     ArgumentNullException.ThrowIfNull(first);
     ArgumentNullException.ThrowIfNull(second);
@@ -26,10 +17,6 @@ public static class ExpressionExtensions {
     return Expression.Lambda<Func<T, bool>>(combinedBody, parameter);
   }
 
-  /// <summary>
-  /// Combines two predicates with OR. Uses a single parameter and Expression.OrElse;
-  /// safe for IQueryable/EF Core (no Invoke).
-  /// </summary>
   public static Expression<Func<T, bool>> OrElse<T>(this Expression<Func<T, bool>> first, Expression<Func<T, bool>> second) {
     ArgumentNullException.ThrowIfNull(first);
     ArgumentNullException.ThrowIfNull(second);
@@ -43,7 +30,7 @@ public static class ExpressionExtensions {
   }
 
   public static Expression<Func<T, bool>> Not<T>(this Expression<Func<T, bool>> expression) {
-    ArgumentNullException.ThrowIfNull(expression);
+    if (expression == null) throw new ArgumentNullException(nameof(expression));
 
     var parameter = expression.Parameters[0];
     var body = Expression.Not(expression.Body);

src/MaksIT.Core/Extensions/ObjectExtensions.cs

@@ -1,5 +1,6 @@
-using System.Reflection;
+using System.Reflection;
 using System.Runtime.CompilerServices;
+using System.Runtime.Serialization;
 using System.Text.Json;
 using System.Text.Json.Serialization;
 
@@ -41,7 +42,6 @@ public static class ObjectExtensions {
   /// Creates a deep clone of the object, preserving reference identity and supporting cycles.
   /// </summary>
   public static T DeepClone<T>(this T source) {
-    if (source is null) return default!;
     return (T)DeepCloneInternal(source, new Dictionary<object, object>(ReferenceEqualityComparer.Instance));
   }
 
@@ -49,9 +49,7 @@ public static class ObjectExtensions {
   /// Deeply compares two objects for structural equality (fields, including private ones).
   /// </summary>
   public static bool DeepEqual<T>(this T a, T b) {
-    if (a is null && b is null) return true;
+    return DeepEqualInternal(a, b, new HashSet<(object, object)>(ReferencePairComparer.Instance));
-    if (a is null || b is null) return false;
-    return DeepEqualInternal(a!, b!, new HashSet<(object, object)>(ReferencePairComparer.Instance));
   }
 
   /// <summary>
@@ -86,7 +84,7 @@ public static class ObjectExtensions {
       return CloneStruct(source, type, visited);
 
     // Reference type: allocate uninitialized object, then copy fields
-    var clone = RuntimeHelpers.GetUninitializedObject(type);
+    var clone = FormatterServices.GetUninitializedObject(type);
     visited[source] = clone;
     CopyAllFields(source, clone, type, visited);
     return clone;
@@ -251,8 +249,8 @@ public static class ObjectExtensions {
 
   private sealed class ReferenceEqualityComparer : IEqualityComparer<object> {
     public static readonly ReferenceEqualityComparer Instance = new ReferenceEqualityComparer();
-    public new bool Equals(object? x, object? y) => ReferenceEquals(x, y);
+    public new bool Equals(object x, object y) => ReferenceEquals(x, y);
-    public int GetHashCode(object? obj) => RuntimeHelpers.GetHashCode(obj!);
+    public int GetHashCode(object obj) => RuntimeHelpers.GetHashCode(obj);
   }
 
   private sealed class ReferencePairComparer : IEqualityComparer<(object, object)> {

src/MaksIT.Core/Extensions/StringExtensions.cs

@@ -1,4 +1,4 @@
-using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations;
 using System.Data;
 using System.Globalization;
 using System.Security.Cryptography;
@@ -246,8 +246,8 @@ namespace MaksIT.Core.Extensions {
     public static string ToKebabCase(this string input) => input.ToCase(StringCaseStyle.KebabCase);
 
     public static DataTable CSVToDataTable(this string filePath) {
-      ArgumentNullException.ThrowIfNull(filePath);
+      if (string.IsNullOrEmpty(filePath))
-      if (string.IsNullOrWhiteSpace(filePath)) throw new ArgumentException("File path cannot be empty.", nameof(filePath));
+        throw new ArgumentNullException(nameof(filePath));
 
       using var sr = new StreamReader(filePath);
 

src/MaksIT.Core/Logging/BaseFileLogger.cs

@@ -78,8 +78,7 @@ public abstract class BaseFileLogger : ILogger, IDisposable {
 
     foreach (var logFile in logFiles) {
       var fileName = Path.GetFileNameWithoutExtension(logFile);
-      if (fileName.Length >= 4 && fileName.StartsWith("log_", StringComparison.Ordinal) &&
+      if (DateTime.TryParseExact(fileName.Substring(4), "yyyy-MM-dd", null, System.Globalization.DateTimeStyles.None, out var logDate)) {
-          DateTime.TryParseExact(fileName.Substring(4), "yyyy-MM-dd", null, System.Globalization.DateTimeStyles.None, out var logDate)) {
         if (logDate < expirationDate) {
           File.Delete(logFile);
         }

src/MaksIT.Core/Logging/FileLoggerProvider.cs

@@ -8,8 +8,7 @@ public class FileLoggerProvider : ILoggerProvider {
   private readonly TimeSpan _retentionPeriod;
 
   public FileLoggerProvider(string folderPath, TimeSpan? retentionPeriod = null) {
-    ArgumentNullException.ThrowIfNull(folderPath);
+    _folderPath = folderPath ?? throw new ArgumentNullException(nameof(folderPath));
-    _folderPath = folderPath;
     _retentionPeriod = retentionPeriod ?? TimeSpan.FromDays(7); // Default retention period is 7 days
   }
 

src/MaksIT.Core/Logging/JsonFileLoggerProvider.cs

@@ -8,8 +8,7 @@ public class JsonFileLoggerProvider : ILoggerProvider {
   private readonly TimeSpan _retentionPeriod;
 
   public JsonFileLoggerProvider(string folderPath, TimeSpan? retentionPeriod = null) {
-    ArgumentNullException.ThrowIfNull(folderPath);
+    _folderPath = folderPath ?? throw new ArgumentNullException(nameof(folderPath));
-    _folderPath = folderPath;
     _retentionPeriod = retentionPeriod ?? TimeSpan.FromDays(7); // Default retention period is 7 days
   }
 

src/MaksIT.Core/MaksIT.Core.csproj

@@ -12,7 +12,7 @@
 
     <!-- NuGet package metadata -->
     <PackageId>MaksIT.Core</PackageId>
-    <Version>1.6.5</Version>
+    <Version>1.6.4</Version>
     <Authors>Maksym Sadovnychyy</Authors>
     <Company>MAKS-IT</Company>
     <Product>MaksIT.Core</Product>

src/MaksIT.Core/Networking/Windows/NetworkConnection.cs

@@ -1,4 +1,4 @@
-using System.Diagnostics.CodeAnalysis;
+using System.Diagnostics.CodeAnalysis;
 using System.Net;
 using System.Runtime.InteropServices;
 using Microsoft.Extensions.Logging;
@@ -27,9 +27,9 @@ public class NetworkConnection : IDisposable {
         throw new PlatformNotSupportedException("NetworkConnection is only supported on Windows.");
       }
 
-      ArgumentNullException.ThrowIfNull(logger);
+      if (logger == null) throw new ArgumentNullException(nameof(logger));
-      ArgumentNullException.ThrowIfNull(networkName);
+      if (networkName == null) throw new ArgumentNullException(nameof(networkName));
-      ArgumentNullException.ThrowIfNull(credentials);
+      if (credentials == null) throw new ArgumentNullException(nameof(credentials));
 
       var netResource = new NetResource {
         Scope = ResourceScope.GlobalNetwork,

src/MaksIT.Core/Security/Base32Encoder.cs

@@ -1,4 +1,4 @@
-using System.Text;
+using System.Text;
 using System.Diagnostics.CodeAnalysis;
 
 
@@ -14,8 +14,9 @@ public static class Base32Encoder {
     [NotNullWhen(false)] out string? errorMessage
   ) {
     try {
-      ArgumentNullException.ThrowIfNull(data);
+      if (data == null || data.Length == 0) {
-      if (data.Length == 0) throw new ArgumentException("Data cannot be empty.", nameof(data));
+        throw new ArgumentNullException(nameof(data));
+      }
 
       var result = new StringBuilder();
       int buffer = data[0];
@@ -65,8 +66,9 @@ public static class Base32Encoder {
     [NotNullWhen(false)] out string? errorMessage
   ) {
     try {
-      ArgumentNullException.ThrowIfNull(base32);
+      if (string.IsNullOrEmpty(base32)) {
-      if (string.IsNullOrWhiteSpace(base32)) throw new ArgumentException("Base32 string cannot be empty.", nameof(base32));
+        throw new ArgumentNullException(nameof(base32));
+      }
 
       base32 = base32.TrimEnd(PaddingChar.ToCharArray());
       int byteCount = base32.Length * 5 / 8;

src/MaksIT.Core/Security/TotpGenerator.cs

@@ -1,4 +1,4 @@
-using System.Diagnostics.CodeAnalysis;
+using System.Diagnostics.CodeAnalysis;
 using System.Security.Cryptography;
 
 namespace MaksIT.Core.Security;
@@ -132,8 +132,8 @@ public static class TotpGenerator {
       recoveryCodes = new List<string>();
 
       for (int i = 0; i < defaultCodeCount; i++) {
-        var code = Guid.NewGuid().ToString("N")[..8]; // Generate an 8-character code
+        var code = Guid.NewGuid().ToString("N").Substring(0, 8); // Generate an 8-character code
-        var formattedCode = $"{code[..4]}-{code[4..8]}"; // Format as XXXX-XXXX
+        var formattedCode = $"{code.Substring(0, 4)}-{code.Substring(4, 4)}"; // Format as XXXX-XXXX
         recoveryCodes.Add(formattedCode);
       }
 

src/MaksIT.Core/Webapi/Models/PagedRequest.cs

@@ -1,15 +1,9 @@
-using System.Linq.Dynamic.Core;
+using System.Linq.Dynamic.Core;
 using System.Linq.Expressions;
 using System.Text.RegularExpressions;
 using MaksIT.Core.Abstractions.Webapi;
 using MaksIT.Core.Extensions;
 
-namespace MaksIT.Core.Webapi.Models;
-
-/// <summary>
-/// Base request model for paged list operations with optional filter and sort.
-/// BuildFilterExpression produces expressions suitable for IQueryable/EF Core (single parameter, translatable operations).
-/// </summary>
 public class PagedRequest : RequestModelBase {
   public int PageSize { get; set; } = 100;
   public int PageNumber { get; set; } = 1;
@@ -22,11 +16,6 @@ public class PagedRequest : RequestModelBase {
     return BuildFilterExpression<T>(Filters);
   }
 
-  /// <summary>
-  /// Parses the filter string into an Expression&lt;Func&lt;T, bool&gt;&gt; for use with IQueryable/EF Core.
-  /// Uses a single parameter; avoid filter syntax that would require non-translatable operations.
-  /// Supported: property access, ==, !=, &amp;&amp;, ||, !, Contains, StartsWith, EndsWith, ToLower() for strings.
-  /// </summary>
   public virtual Expression<Func<T, bool>> BuildFilterExpression<T>(string? filters) {
     if (string.IsNullOrWhiteSpace(filters))
       return x => true; // Returns an expression that doesn't filter anything.