System.Diagnostics.PerformanceCounter by: Microsoft

Provides the System.Diagnostics.PerformanceCounter class, which allows access to Windows performance counters. Commonly Used Types: System.Diagnostics.PerformanceCounter

System.Diagnostics.Tools by: Microsoft

Provides attributes, such as GeneratedCodeAttribute and SuppresMessageAttribute, that are emitted or consumed by analysis tools. Commonly Used Types: System.CodeDom.Compiler.GeneratedCodeAttribute System.Diagnostics.CodeAnalysis.SuppressMessageAttribute

System.Diagnostics.Tracing by: Microsoft

Provides class that enable you to create high performance tracing events to be captured by event tracing for Windows (ETW). Commonly Used Types: System.Diagnostics.Tracing.EventSource System.Diagnostics.Tracing.EventListener System.Diagnostics.Tracing.EventLevel System.Diagnostics.Tracing.EventKeywords System.Diagnostics.Tracing.EventWrittenEventArgs System.Diagnostics.Tracing.EventAttribute System.Diagnostics.Tracing.EventSourceAttribute System.Diagnostics.Tracing.NonEventAttribute

System.Drawing.Common by: Microsoft

Provides access to GDI+ graphics functionality. Commonly Used Types: System.Drawing.Bitmap System.Drawing.BitmapData System.Drawing.Brush System.Drawing.Font System.Drawing.Graphics System.Drawing.Icon Since .NET 7, non-Windows platforms are not supported, even with the runtime configuration switch. See https://aka.ms/systemdrawingnonwindows for more information.

System.Dynamic.Runtime by: Microsoft

Provides classes and interfaces that support the Dynamic Language Runtime (DLR). Commonly Used Types: System.Runtime.CompilerServices.CallSite System.Runtime.CompilerServices.CallSite<T> System.Dynamic.IDynamicMetaObjectProvider System.Dynamic.DynamicMetaObject System.Dynamic.SetMemberBinder System.Dynamic.GetMemberBinder System.Dynamic.ExpandoObject System.Dynamic.DynamicObject System.Runtime.CompilerServices.CallSiteBinder System.Runtime.CompilerServices.ConditionalWeakTable<TKey, TValue>

System.Formats.Asn1 by: Microsoft

Provides classes that can read and write the ASN.1 BER, CER, and DER data formats.

System.Formats.Nrbf by: Microsoft

Provides a safe reader for .NET Remoting Binary Format (NRBF) payloads.

System.Globalization by: Microsoft

Provides classes that define culture-related information, including language, country/region, calendars in use, format patterns for dates, currency, and numbers, and sort order for strings. Commonly Used Types: System.Globalization.DateTimeFormatInfo System.Globalization.CultureInfo System.Globalization.NumberFormatInfo System.Globalization.CalendarWeekRule System.Globalization.TextInfo System.Globalization.Calendar System.Globalization.CompareInfo System.Globalization.CompareOptions System.Globalization.UnicodeCategory

System.IdentityModel.Tokens.Jwt by: Microsoft

Includes types that provide support for creating, serializing and validating JSON Web Tokens. As of IdentityModel 7x, this is a legacy tool that should be replaced with Microsoft.IdentityModel.JsonWebTokens.

System.IO.Compression by: Microsoft

Provides classes that support the compression and decompression of streams. Commonly Used Types: System.IO.Compression.DeflateStream System.IO.Compression.GZipStream System.IO.Compression.CompressionMode System.IO.Compression.CompressionLevel System.IO.Compression.ZipArchiveEntry System.IO.Compression.ZipArchive System.IO.Compression.ZipArchiveMode

System.IO.FileSystem by: Microsoft

Provides types that allow reading and writing to files and types that provide basic file and directory support. Commonly Used Types: System.IO.FileStream System.IO.FileInfo System.IO.DirectoryInfo System.IO.FileSystemInfo System.IO.File System.IO.Directory System.IO.SearchOption System.IO.FileOptions

System.IO.FileSystem.Primitives by: Microsoft

Provides common enumerations and exceptions for path-based I/O libraries. Commonly Used Types: System.IO.DirectoryNotFoundException System.IO.FileAccess System.IO.FileLoadException System.IO.PathTooLongException System.IO.FileMode System.IO.FileShare System.IO.FileAttributes

System.IO.Hashing by: Microsoft

Provides non-cryptographic hash algorithms, such as CRC-32. Commonly Used Types: System.IO.Hashing.Crc32 System.IO.Hashing.XxHash32

System.IO.MemoryMappedFiles by: Microsoft

Provides classes for using a memory-mapped file, which maps the contents of a file to an application's logical address space. Commonly Used Types: System.IO.MemoryMappedFiles.MemoryMappedViewAccessor System.IO.MemoryMappedFiles.MemoryMappedViewStream System.IO.MemoryMappedFiles.MemoryMappedFile System.IO.MemoryMappedFiles.MemoryMappedFileAccess

System.IO.Pipelines by: Microsoft

Single producer single consumer byte buffer management. Commonly Used Types: System.IO.Pipelines.Pipe System.IO.Pipelines.PipeWriter System.IO.Pipelines.PipeReader

System.IO.Pipes by: Microsoft

Provides a means for interprocess communication through anonymous and/or named pipes. Commonly Used Types: System.IO.Pipes.NamedPipeServerStream System.IO.Pipes.PipeDirection System.IO.Pipes.PipeOptions System.IO.Pipes.PipeTransmissionMode System.IO.Pipes.NamedPipeClientStream System.IO.Pipes.PipeStream

System.IO.UnmanagedMemoryStream by: Microsoft

Provides classes for access to unmanaged blocks of memory from managed code. Commonly Used Types: System.IO.UnmanagedMemoryStream System.IO.UnmanagedMemoryAccessor

System.Linq by: Microsoft

Provides classes and interfaces that supports queries that use Language-Integrated Query (LINQ). Commonly Used Types: System.Linq.Enumerable System.Linq.IGrouping<TKey, TElement> System.Linq.IOrderedEnumerable<TElement> System.Linq.ILookup<TKey, TElement> System.Linq.Lookup<TKey, TElement>

System.Linq.AsyncEnumerable by: Microsoft

System.Linq.AsyncEnumerable

System.Linq.Expressions by: Microsoft

Provides classes, interfaces and enumerations that enable language-level code expressions to be represented as objects in the form of expression trees. Commonly Used Types: System.Linq.Expressions.Expression<TDelegate> System.Linq.Expressions.Expression System.Linq.Expressions.MemberExpression System.Linq.Expressions.ExpressionVisitor System.Linq.Expressions.MethodCallExpression System.Linq.IQueryable<T> System.Linq.IQueryable System.Linq.Expressions.NewExpression System.Linq.Expressions.ParameterExpression System.Linq.Expressions.ConstantExpression