API diff between .NET 9 Preview 7 and .NET 9 RC 1

release-notes/9.0/preview/rc1/api-diff/Microsoft.AspNetCore.App/9.0-rc1.md

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+# API Difference 9.0-preview7 vs 9.0-rc1
+
+API listing follows standard diff formatting.
+Lines preceded by a '+' are additions and a '-' indicates removal.
+
+* [Microsoft.AspNetCore.Builder](9.0-rc1_Microsoft.AspNetCore.Builder.md)
+* [Microsoft.AspNetCore.Components](9.0-rc1_Microsoft.AspNetCore.Components.md)
+* [Microsoft.AspNetCore.Components.Routing](9.0-rc1_Microsoft.AspNetCore.Components.Routing.md)
+* [Microsoft.AspNetCore.Components.Web.Virtualization](9.0-rc1_Microsoft.AspNetCore.Components.Web.Virtualization.md)
+* [Microsoft.AspNetCore.Http](9.0-rc1_Microsoft.AspNetCore.Http.md)
+

release-notes/9.0/preview/rc1/api-diff/Microsoft.AspNetCore.App/9.0-rc1_Microsoft.AspNetCore.Builder.md

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+# Microsoft.AspNetCore.Builder
+
+``` diff
+ namespace Microsoft.AspNetCore.Builder {
+     public class WebSocketOptions {
++        public TimeSpan KeepAliveTimeout { get; set; }
+     }
+ }
+```
+

release-notes/9.0/preview/rc1/api-diff/Microsoft.AspNetCore.App/9.0-rc1_Microsoft.AspNetCore.Components.Routing.md

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+# Microsoft.AspNetCore.Components.Routing
+
+``` diff
+ namespace Microsoft.AspNetCore.Components.Routing {
+     public class FocusOnNavigate : ComponentBase {
++        protected override void BuildRenderTree(RenderTreeBuilder builder);
+     }
+ }
+```
+

release-notes/9.0/preview/rc1/api-diff/Microsoft.AspNetCore.App/9.0-rc1_Microsoft.AspNetCore.Components.Web.Virtualization.md

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+# Microsoft.AspNetCore.Components.Web.Virtualization
+
+``` diff
+ namespace Microsoft.AspNetCore.Components.Web.Virtualization {
+     public sealed class Virtualize<TItem> : ComponentBase, IAsyncDisposable, IVirtualizeJsCallbacks {
++        [ParameterAttribute]
++        public int MaxItemCount { get; set; }
+     }
+ }
+```
+

release-notes/9.0/preview/rc1/api-diff/Microsoft.AspNetCore.App/9.0-rc1_Microsoft.AspNetCore.Components.md

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+# Microsoft.AspNetCore.Components
+
+``` diff
+ namespace Microsoft.AspNetCore.Components {
+     public sealed class ImportMap : IComponent {
++        [ParameterAttribute(CaptureUnmatchedValues=true)]
++        public IReadOnlyDictionary<string, object>? AdditionalAttributes { get; set; }
+     }
+ }
+```
+

release-notes/9.0/preview/rc1/api-diff/Microsoft.AspNetCore.App/9.0-rc1_Microsoft.AspNetCore.Http.md

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+# Microsoft.AspNetCore.Http
+
+``` diff
+ namespace Microsoft.AspNetCore.Http {
+     public class WebSocketAcceptContext {
++        public TimeSpan? KeepAliveTimeout { get; set; }
+     }
+ }
+```
+

release-notes/9.0/preview/rc1/api-diff/Microsoft.NETCore.App/9.0-rc1.md

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+# API Difference 9.0-preview7 vs 9.0-rc1
+
+API listing follows standard diff formatting.
+Lines preceded by a '+' are additions and a '-' indicates removal.
+
+* [System](9.0-rc1_System.md)
+* [System.Collections.Generic](9.0-rc1_System.Collections.Generic.md)
+* [System.Drawing](9.0-rc1_System.Drawing.md)
+* [System.IO.Compression](9.0-rc1_System.IO.Compression.md)
+* [System.Net.WebSockets](9.0-rc1_System.Net.WebSockets.md)
+* [System.Reflection.Emit](9.0-rc1_System.Reflection.Emit.md)
+* [System.Reflection.Metadata](9.0-rc1_System.Reflection.Metadata.md)
+* [System.Runtime.Intrinsics.Arm](9.0-rc1_System.Runtime.Intrinsics.Arm.md)
+* [System.Runtime.Intrinsics.X86](9.0-rc1_System.Runtime.Intrinsics.X86.md)
+* [System.Security.Cryptography](9.0-rc1_System.Security.Cryptography.md)
+

release-notes/9.0/preview/rc1/api-diff/Microsoft.NETCore.App/9.0-rc1_System.Collections.Generic.md

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+# System.Collections.Generic
+
+``` diff
+ namespace System.Collections.Generic {
+     public static class CollectionExtensions {
+-        public static HashSet.AlternateLookup<TAlternate> GetAlternateLookup<T, TAlternate>(this HashSet<T> @set);
+-        public static Dictionary.AlternateLookup<TAlternateKey> GetAlternateLookup<TKey, TValue, TAlternateKey>(this Dictionary<TKey, TValue> dictionary);
+-        public static bool TryGetAlternateLookup<T, TAlternate>(this HashSet<T> @set, out HashSet.AlternateLookup<TAlternate> lookup);
+-        public static bool TryGetAlternateLookup<TKey, TValue, TAlternateKey>(this Dictionary<TKey, TValue> dictionary, out Dictionary.AlternateLookup<TAlternateKey> lookup);
+     }
+     public class Dictionary<TKey, TValue> : ICollection, ICollection<KeyValuePair<TKey, TValue>>, IDeserializationCallback, IDictionary, IDictionary<TKey, TValue>, IEnumerable, IEnumerable<KeyValuePair<TKey, TValue>>, IReadOnlyCollection<KeyValuePair<TKey, TValue>>, IReadOnlyDictionary<TKey, TValue>, ISerializable {
++        public Dictionary.AlternateLookup<TAlternateKey> GetAlternateLookup<TAlternateKey>();
++        public bool TryGetAlternateLookup<TAlternateKey>(out Dictionary.AlternateLookup<TAlternateKey> lookup);
+     }
+     public class HashSet<T> : ICollection<T>, IDeserializationCallback, IEnumerable, IEnumerable<T>, IReadOnlyCollection<T>, IReadOnlySet<T>, ISerializable, ISet<T> {
++        public HashSet.AlternateLookup<TAlternate> GetAlternateLookup<TAlternate>();
++        public bool TryGetAlternateLookup<TAlternate>(out HashSet.AlternateLookup<TAlternate> lookup);
+     }
+ }
+```
+

release-notes/9.0/preview/rc1/api-diff/Microsoft.NETCore.App/9.0-rc1_System.Drawing.md

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+# System.Drawing
+
+``` diff
+ namespace System.Drawing {
+     public static class SystemColors {
++        [ExperimentalAttribute("SYSLIB5002", UrlFormat="https://aka.ms/dotnet-warnings/{0}")]
++        public static bool UseAlternativeColorSet { get; set; }
+     }
+ }
+```
+

release-notes/9.0/preview/rc1/api-diff/Microsoft.NETCore.App/9.0-rc1_System.IO.Compression.md

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+# System.IO.Compression
+
+``` diff
+ namespace System.IO.Compression {
++    public sealed class BrotliCompressionOptions {
++        public BrotliCompressionOptions();
++        public int Quality { get; set; }
++    }
+     public sealed class BrotliStream : Stream {
++        public BrotliStream(Stream stream, BrotliCompressionOptions compressionOptions, bool leaveOpen = false);
+     }
+     public class DeflateStream : Stream {
++        public DeflateStream(Stream stream, ZLibCompressionOptions compressionOptions, bool leaveOpen = false);
+     }
+     public class GZipStream : Stream {
++        public GZipStream(Stream stream, ZLibCompressionOptions compressionOptions, bool leaveOpen = false);
+     }
++    public sealed class ZLibCompressionOptions {
++        public ZLibCompressionOptions();
++        public int CompressionLevel { get; set; }
++        public ZLibCompressionStrategy CompressionStrategy { get; set; }
++    }
++    public enum ZLibCompressionStrategy {
++        Default = 0,
++        Filtered = 1,
++        Fixed = 4,
++        HuffmanOnly = 2,
++        RunLengthEncoding = 3,
++    }
+     public sealed class ZLibStream : Stream {
++        public ZLibStream(Stream stream, ZLibCompressionOptions compressionOptions, bool leaveOpen = false);
+     }
+ }
+```
+

release-notes/9.0/preview/rc1/api-diff/Microsoft.NETCore.App/9.0-rc1_System.Net.WebSockets.md

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+# System.Net.WebSockets
+
+``` diff
+ namespace System.Net.WebSockets {
+     public sealed class ClientWebSocketOptions {
++        [UnsupportedOSPlatformAttribute("browser")]
++        public TimeSpan KeepAliveTimeout { get; set; }
+     }
+     public sealed class WebSocketCreationOptions {
++        public TimeSpan KeepAliveTimeout { get; set; }
+     }
+ }
+```
+

release-notes/9.0/preview/rc1/api-diff/Microsoft.NETCore.App/9.0-rc1_System.Reflection.Emit.md

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+# System.Reflection.Emit
+
+``` diff
+ namespace System.Reflection.Emit {
+     public abstract class TypeBuilder : TypeInfo {
+-        public PropertyBuilder DefineProperty(string name, PropertyAttributes attributes, CallingConventions callingConvention, Type returnType, Type[]? parameterTypes);
++        public PropertyBuilder DefineProperty(string name, PropertyAttributes attributes, CallingConventions callingConvention, Type? returnType, Type[]? parameterTypes);
+-        public PropertyBuilder DefineProperty(string name, PropertyAttributes attributes, CallingConventions callingConvention, Type returnType, Type[]? returnTypeRequiredCustomModifiers, Type[]? returnTypeOptionalCustomModifiers, Type[]? parameterTypes, Type[][]? parameterTypeRequiredCustomModifiers, Type[][]? parameterTypeOptionalCustomModifiers);
++        public PropertyBuilder DefineProperty(string name, PropertyAttributes attributes, CallingConventions callingConvention, Type? returnType, Type[]? returnTypeRequiredCustomModifiers, Type[]? returnTypeOptionalCustomModifiers, Type[]? parameterTypes, Type[][]? parameterTypeRequiredCustomModifiers, Type[][]? parameterTypeOptionalCustomModifiers);
+-        public PropertyBuilder DefineProperty(string name, PropertyAttributes attributes, Type returnType, Type[]? parameterTypes);
++        public PropertyBuilder DefineProperty(string name, PropertyAttributes attributes, Type? returnType, Type[]? parameterTypes);
+-        public PropertyBuilder DefineProperty(string name, PropertyAttributes attributes, Type returnType, Type[]? returnTypeRequiredCustomModifiers, Type[]? returnTypeOptionalCustomModifiers, Type[]? parameterTypes, Type[][]? parameterTypeRequiredCustomModifiers, Type[][]? parameterTypeOptionalCustomModifiers);
++        public PropertyBuilder DefineProperty(string name, PropertyAttributes attributes, Type? returnType, Type[]? returnTypeRequiredCustomModifiers, Type[]? returnTypeOptionalCustomModifiers, Type[]? parameterTypes, Type[][]? parameterTypeRequiredCustomModifiers, Type[][]? parameterTypeOptionalCustomModifiers);
+-        protected abstract PropertyBuilder DefinePropertyCore(string name, PropertyAttributes attributes, CallingConventions callingConvention, Type returnType, Type[]? returnTypeRequiredCustomModifiers, Type[]? returnTypeOptionalCustomModifiers, Type[]? parameterTypes, Type[][]? parameterTypeRequiredCustomModifiers, Type[][]? parameterTypeOptionalCustomModifiers);
++        protected abstract PropertyBuilder DefinePropertyCore(string name, PropertyAttributes attributes, CallingConventions callingConvention, Type? returnType, Type[]? returnTypeRequiredCustomModifiers, Type[]? returnTypeOptionalCustomModifiers, Type[]? parameterTypes, Type[][]? parameterTypeRequiredCustomModifiers, Type[][]? parameterTypeOptionalCustomModifiers);
+     }
+ }
+```
+

release-notes/9.0/preview/rc1/api-diff/Microsoft.NETCore.App/9.0-rc1_System.Reflection.Metadata.md

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+# System.Reflection.Metadata
+
+``` diff
+ namespace System.Reflection.Metadata {
+     public sealed class TypeName {
+-        public TypeName? DeclaringType { get; }
++        public TypeName DeclaringType { get; }
++        public TypeName MakeArrayTypeName(int rank);
++        public TypeName MakeByRefTypeName();
++        public TypeName MakeGenericTypeName(ImmutableArray<TypeName> typeArguments);
++        public TypeName MakePointerTypeName();
++        public TypeName MakeSZArrayTypeName();
++        public TypeName WithAssemblyName(AssemblyNameInfo? assemblyName);
+     }
+ }
+```
+