.NET 8で追加されたであろうAPIを知りたかったので調べた。
最初はMicrosoft Learnをスクレイピングするかと思ったのだが、よくよく考えてみれば普通にGitHubリポジトリ（dotnet/dotnet-api-docs）に上がってたのでこっちを解析することにした。
使用したコードを置いておく。酩酊状態でtypoしまくりながら30分くらいかけて書いた。
結果
計553クラス4237メンバがあった。そのままだと2738行もあってはてなブログの編集画面が激重になるため、System名前空間の最初の400行くらいを載せておく。（半分くらい Frozen で埋まってる気がする…）
System.ArgumentException- ThrowIfNullOrWhiteSpace
System.ArgumentOutOfRangeException- ThrowIfEqual
- ThrowIfGreaterThan
- ThrowIfGreaterThanOrEqual
- ThrowIfLessThan
- ThrowIfLessThanOrEqual
- ThrowIfNegative
- ThrowIfNegativeOrZero
- ThrowIfNotEqual
- ThrowIfZero
- ThrowIfEqual
System.BinaryData- FromBytes
- FromStream
- FromStreamAsync
- FromString
- IsEmpty
- Length
- MediaType
- WithMediaType
System.Boolean- System.IParsable<System.Boolean>.Parse
- System.IParsable<System.Boolean>.TryParse
- System.ISpanParsable<System.Boolean>.Parse
- System.ISpanParsable<System.Boolean>.TryParse
System.Byte- Parse
- TryFormat
- TryParse
System.Char- System.IUtf8SpanFormattable.TryFormat
System.ConsoleKey- None
System.ConsoleModifiers- None
System.DateOnly- Deconstruct
- TryFormat
System.DateTime- Deconstruct
- TryFormat
System.DateTimeOffset- Deconstruct
- TotalOffsetMinutes
- TryFormat
System.Decimal- Parse
- TryFormat
- TryParse
System.Double- DegreesToRadians
- Lerp
- Parse
- RadiansToDegrees
- TryFormat
- TryParse
System.Enum- System.ISpanFormattable.TryFormat
- TryFormat
System.Environment- IsPrivilegedProcess
System.FakeLoggerServiceProviderExtensions- GetFakeLogCollector
System.FakeRedactionServiceProviderExtensions- GetFakeRedactionCollector
System.GC- RefreshMemoryLimit
- RegisterNoGCRegionCallback
System.Guid- System.IUtf8SpanFormattable.TryFormat
- ToByteArray
- TryFormat
- TryWriteBytes
System.Half- DegreesToRadians
- Lerp
- Parse
- RadiansToDegrees
- TryFormat
- TryParse
System.Int128- Parse
- TryFormat
- TryParse
System.Int16- Parse
- TryFormat
- TryParse
System.Int32- Parse
- TryFormat
- TryParse
System.Int64- Parse
- TryFormat
- TryParse
System.IntPtr- Parse
- TryFormat
- TryParse
System.IUtf8SpanFormattable- TryFormat
System.IUtf8SpanParsable<TSelf>- Parse
- TryParse
System.MemoryExtensions- AsSpan
- ContainsAny
- ContainsAnyExcept
- ContainsAnyExceptInRange
- ContainsAnyInRange
- Count
- IndexOfAny
- IndexOfAnyExcept
- IndexOfAnyExceptInRange
- IndexOfAnyInRange
- LastIndexOfAny
- LastIndexOfAnyExcept
- LastIndexOfAnyExceptInRange
- LastIndexOfAnyInRange
- Replace
- Split
- SplitAny
- TryWrite
- TryWrite
- TryWrite<TArg0,TArg1>
- TryWrite<TArg0,TArg1,TArg2>
System.OperatingSystem- IsWasi
System.Random- GetItems
- Shuffle
- GetItems
System.SByte- Parse
- TryFormat
- TryParse
System.Single- DegreesToRadians
- Lerp
- Parse
- RadiansToDegrees
- TryFormat
- TryParse
System.String- Format
- Format
- Format<TArg0,TArg1>
- Format<TArg0,TArg1,TArg2>
- System.IParsable<System.String>.Parse
- System.IParsable<System.String>.TryParse
- System.ISpanParsable<System.String>.Parse
- System.ISpanParsable<System.String>.TryParse
System.TimeOnly- Deconstruct
- TryFormat
System.TimeProvider- CreateTimer
- GetElapsedTime
- GetLocalNow
- GetTimestamp
- GetUtcNow
- LocalTimeZone
- System
- TimestampFrequency
System.TimeSpan- TryFormat
System.TimeZoneInfo- GetSystemTimeZones
- TryFindSystemTimeZoneById
System.Type- GetFunctionPointerCallingConventions
- GetFunctionPointerParameterTypes
- GetFunctionPointerReturnType
- GetOptionalCustomModifiers
- GetRequiredCustomModifiers
- IsFunctionPointer
- IsUnmanagedFunctionPointer
System.UInt128- Parse
- TryFormat
- TryParse
System.UInt16- Parse
- TryFormat
- TryParse
System.UInt32- Parse
- TryFormat
- TryParse
System.UInt64- Parse
- TryFormat
- TryParse
System.UIntPtr- Parse
- TryFormat
- TryParse
System.Uri- System.IFormattable.ToString
- System.ISpanFormattable.TryFormat
- TryFormat
System.Version- System.IUtf8SpanFormattable.TryFormat
- TryFormat
System.Buffers.ArrayBufferWriter<T>- ResetWrittenCount
System.Buffers.SearchValues- Create
System.Buffers.SearchValues<T>- Contains
System.Buffers.Binary.BinaryPrimitives- ReadInt128BigEndian
- ReadInt128LittleEndian
- ReadIntPtrBigEndian
- ReadIntPtrLittleEndian
- ReadUInt128BigEndian
- ReadUInt128LittleEndian
- ReadUIntPtrBigEndian
- ReadUIntPtrLittleEndian
- ReverseEndianness
- TryReadInt128BigEndian
- TryReadInt128LittleEndian
- TryReadIntPtrBigEndian
- TryReadIntPtrLittleEndian
- TryReadUInt128BigEndian
- TryReadUInt128LittleEndian
- TryReadUIntPtrBigEndian
- TryReadUIntPtrLittleEndian
- TryWriteInt128BigEndian
- TryWriteInt128LittleEndian
- TryWriteIntPtrBigEndian
- TryWriteIntPtrLittleEndian
- TryWriteUInt128BigEndian
- TryWriteUInt128LittleEndian
- TryWriteUIntPtrBigEndian
- TryWriteUIntPtrLittleEndian
- WriteInt128BigEndian
- WriteInt128LittleEndian
- WriteIntPtrBigEndian
- WriteIntPtrLittleEndian
- WriteUInt128BigEndian
- WriteUInt128LittleEndian
- WriteUIntPtrBigEndian
- WriteUIntPtrLittleEndian
System.Buffers.Text.Base64- IsValid
System.CodeDom.Compiler.IndentedTextWriter- FlushAsync
System.Collections.BitArray- HasAllSet
- HasAnySet
System.Collections.Frozen.FrozenDictionary- ToFrozenDictionary<TKey,TValue>
- ToFrozenDictionary<TSource,TKey>
- ToFrozenDictionary<TSource,TKey,TElement>
System.Collections.Frozen.FrozenDictionary<TKey,TValue>+Enumerator- Current
- MoveNext
- System.Collections.IEnumerator.Current
- System.Collections.IEnumerator.Reset
- System.IDisposable.Dispose
System.Collections.Frozen.FrozenDictionary<TKey,TValue>- Comparer
- ContainsKey
- CopyTo
- Count
- Empty
- GetEnumerator
- GetValueRefOrNullRef
- Item
- Keys
- System.Collections.Generic.ICollection<System.Collections.Generic.KeyValuePair<TKey,TValue>>.Add
- System.Collections.Generic.ICollection<System.Collections.Generic.KeyValuePair<TKey,TValue>>.Clear
- System.Collections.Generic.ICollection<System.Collections.Generic.KeyValuePair<TKey,TValue>>.Contains
- System.Collections.Generic.ICollection<System.Collections.Generic.KeyValuePair<TKey,TValue>>.IsReadOnly
- System.Collections.Generic.ICollection<System.Collections.Generic.KeyValuePair<TKey,TValue>>.Remove
- System.Collections.Generic.IDictionary<TKey,TValue>.Add
- System.Collections.Generic.IDictionary<TKey,TValue>.Item
- System.Collections.Generic.IDictionary<TKey,TValue>.Keys
- System.Collections.Generic.IDictionary<TKey,TValue>.Remove
- System.Collections.Generic.IDictionary<TKey,TValue>.Values
- System.Collections.Generic.IEnumerable<System.Collections.Generic.KeyValuePair<TKey,TValue>>.GetEnumerator
- System.Collections.Generic.IReadOnlyDictionary<TKey,TValue>.Item
- System.Collections.Generic.IReadOnlyDictionary<TKey,TValue>.Keys
- System.Collections.Generic.IReadOnlyDictionary<TKey,TValue>.Values
- System.Collections.ICollection.CopyTo
- System.Collections.ICollection.IsSynchronized
- System.Collections.ICollection.SyncRoot
- System.Collections.IDictionary.Add
- System.Collections.IDictionary.Clear
- System.Collections.IDictionary.Contains
- System.Collections.IDictionary.GetEnumerator
- System.Collections.IDictionary.IsFixedSize
- System.Collections.IDictionary.IsReadOnly
- System.Collections.IDictionary.Item
- System.Collections.IDictionary.Keys
- System.Collections.IDictionary.Remove
- System.Collections.IDictionary.Values
- System.Collections.IEnumerable.GetEnumerator
- TryGetValue
- Values
System.Collections.Frozen.FrozenSet- ToFrozenSet
- ToFrozenSet
System.Collections.Frozen.FrozenSet<T>+Enumerator- Current
- MoveNext
- System.Collections.IEnumerator.Current
- System.Collections.IEnumerator.Reset
- System.IDisposable.Dispose
System.Collections.Frozen.FrozenSet<T>- Comparer
- Contains
- CopyTo
- Count
- Empty
- GetEnumerator
- IsProperSubsetOf
- IsProperSupersetOf
- IsSubsetOf
- IsSupersetOf
- Items
- Overlaps
- SetEquals
- System.Collections.Generic.ICollection
.Add - System.Collections.Generic.ICollection
.Clear - System.Collections.Generic.ICollection
.IsReadOnly - System.Collections.Generic.ICollection
.Remove - System.Collections.Generic.IEnumerable
.GetEnumerator - System.Collections.Generic.ISet
.Add - System.Collections.Generic.ISet
.ExceptWith - System.Collections.Generic.ISet
.IntersectWith - System.Collections.Generic.ISet
.SymmetricExceptWith - System.Collections.Generic.ISet
.UnionWith - System.Collections.ICollection.CopyTo
- System.Collections.ICollection.IsSynchronized
- System.Collections.ICollection.SyncRoot
- System.Collections.IEnumerable.GetEnumerator
- TryGetValue
System.Collections.Generic.CollectionExtensions- AddRange
- CopyTo
- InsertRange
- AddRange
System.Collections.Generic.Dictionary<TKey,TValue>+KeyCollection- Contains
System.Collections.Generic.EqualityComparer<T>- Create
System.Collections.Generic.List<T>- Slice
System.Collections.Generic.PriorityQueue<TElement,TPriority>- DequeueEnqueue
System.Collections.Generic.SortedDictionary<TKey,TValue>+KeyCollection- Contains
System.Collections.Immutable.ImmutableArray<T>+Builder- DrainToImmutable
System.Collections.Immutable.ImmutableArray<T>- Contains
System.Collections.Immutable.ImmutableHashSet- Create
- Create
System.Collections.Immutable.ImmutableList- Create
- Create
System.Collections.Immutable.ImmutableQueue- Create
- Create
System.Collections.Immutable.ImmutableSortedSet- Create
- Create
System.Collections.Immutable.ImmutableStack- Create
- Create
System.Collections.ObjectModel.ReadOnlyCollection<T>- Empty
System.Collections.ObjectModel.ReadOnlyDictionary<TKey,TValue>+KeyCollection- Contains
System.Collections.ObjectModel.ReadOnlyDictionary<TKey,TValue>- Empty
System.Collections.ObjectModel.ReadOnlyObservableCollection<T>- Empty
System.ComponentModel.DataAnnotations.AllowedValuesAttribute- IsValid
- Values
System.ComponentModel.DataAnnotations.Base64StringAttribute- IsValid
System.ComponentModel.DataAnnotations.DeniedValuesAttribute- IsValid
- Values
System.ComponentModel.DataAnnotations.LengthAttribute- FormatErrorMessage
- IsValid
- MaximumLength
- MinimumLength
System.ComponentModel.DataAnnotations.RangeAttribute- MaximumIsExclusive
- MinimumIsExclusive
