Add [JsonConstructor] and support for deserializing with parameterized ctors

src/libraries/System.Text.Json/ref/System.Text.Json.cs

@@ -753,6 +753,11 @@ protected internal JsonConverter() { }
         public abstract T Read(ref System.Text.Json.Utf8JsonReader reader, System.Type typeToConvert, System.Text.Json.JsonSerializerOptions options);
         public abstract void Write(System.Text.Json.Utf8JsonWriter writer, [System.Diagnostics.CodeAnalysis.DisallowNull] T value, System.Text.Json.JsonSerializerOptions options);
     }
+    [System.AttributeUsageAttribute(System.AttributeTargets.Constructor, AllowMultiple = false)]
+    public sealed partial class JsonConstructorAttribute : System.Text.Json.Serialization.JsonAttribute
+    {
+        public JsonConstructorAttribute() { }
+    }
     [System.AttributeUsageAttribute(System.AttributeTargets.Property, AllowMultiple=false)]
     public sealed partial class JsonExtensionDataAttribute : System.Text.Json.Serialization.JsonAttribute
     {

src/libraries/System.Text.Json/src/Resources/Strings.resx

@@ -375,8 +375,8 @@
   <data name="JsonSerializerDoesNotSupportComments" xml:space="preserve">
     <value>Comments cannot be stored when deserializing objects, only the Skip and Disallow comment handling modes are supported.</value>
   </data>
-  <data name="DeserializeMissingParameterlessConstructor" xml:space="preserve">
-    <value>Deserialization of reference types without parameterless constructor is not supported. Type '{0}'</value>
+  <data name="DeserializeMissingDeserializationConstructor" xml:space="preserve">
+    <value>Deserialization of reference types without a parameterless constructor, a singular parameterized constructor, or a parameterized constructor annotated with '{0}' is not supported. Type '{1}'</value>
   </data>
   <data name="DeserializePolymorphicInterface" xml:space="preserve">
     <value>Deserialization of interface types is not supported. Type '{0}'</value>
@@ -482,10 +482,25 @@
   <data name="MetadataInvalidPropertyWithLeadingDollarSign" xml:space="preserve">
     <value>Properties that start with '$' are not allowed on preserve mode, either escape the character or turn off preserve references by setting ReferenceHandling to ReferenceHandling.Default.</value>
   </data>
+  <data name="MultipleMembersBindWithConstructorParameter" xml:space="preserve">
+    <value>Members '{0}' and '{1}' on type '{2}' cannot both bind with parameter '{3}' in constructor '{4}' on deserialization.</value>
+  </data>
+  <data name="ConstructorParamIncompleteBinding" xml:space="preserve">
+    <value>Each parameter in constructor '{0}' on type '{1}' must bind to an object member on deserialization. Each parameter name must be the camel case equivalent of an object member named with the pascal case naming convention.</value>
+  </data>
+  <data name="ConstructorMaxOf64Parameters" xml:space="preserve">
+    <value>The constructor '{0}' on type '{1}' may not have more than 64 parameters for deserialization.</value>
+  </data>
+  <data name="ObjectWithParameterizedCtorRefMetadataNotHonored" xml:space="preserve">
+    <value>Reference metadata is not honored when deserializing types using parameterized constructors. See type '{0}'.</value>
+  </data>
   <data name="SerializerConverterFactoryReturnsNull" xml:space="preserve">
     <value>The converter '{0}' cannot return a null value.</value>
   </data>
   <data name="SerializationNotSupportedParentType" xml:space="preserve">
     <value>The unsupported member type is located on type '{0}'.</value>
   </data>
+  <data name="ExtensionDataCannotBindToCtorParam" xml:space="preserve">
+    <value>The extension data property '{0}' on type '{1}' cannot bind with a parameter in constructor '{2}'.</value>
+  </data>
 </root>

src/libraries/System.Text.Json/src/System.Text.Json.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <DocumentationFile>$(OutputPath)$(MSBuildProjectName).xml</DocumentationFile>
@@ -53,7 +53,9 @@
     <Compile Include="System\Text\Json\Reader\Utf8JsonReader.cs" />
     <Compile Include="System\Text\Json\Reader\Utf8JsonReader.MultiSegment.cs" />
     <Compile Include="System\Text\Json\Reader\Utf8JsonReader.TryGet.cs" />
+    <Compile Include="System\Text\Json\Serialization\Arguments.cs" />
     <Compile Include="System\Text\Json\Serialization\ClassType.cs" />
+    <Compile Include="System\Text\Json\Serialization\ArgumentState.cs" />
     <Compile Include="System\Text\Json\Serialization\ConverterList.cs" />
     <Compile Include="System\Text\Json\Serialization\Converters\Collection\ArrayConverter.cs" />
     <Compile Include="System\Text\Json\Serialization\Converters\Collection\ConcurrentQueueOfTConverter.cs" />
@@ -80,6 +82,9 @@
     <Compile Include="System\Text\Json\Serialization\Converters\Collection\StackOfTConverter.cs" />
     <Compile Include="System\Text\Json\Serialization\Converters\Object\ObjectConverterFactory.cs" />
     <Compile Include="System\Text\Json\Serialization\Converters\Object\ObjectDefaultConverter.cs" />
+    <Compile Include="System\Text\Json\Serialization\Converters\Object\ObjectWithParameterizedConstructorConverter.cs" />
+    <Compile Include="System\Text\Json\Serialization\Converters\Object\ObjectWithParameterizedConstructorConverter.Large.cs" />
+    <Compile Include="System\Text\Json\Serialization\Converters\Object\ObjectWithParameterizedConstructorConverter.Small.cs" />
     <Compile Include="System\Text\Json\Serialization\Converters\Value\BooleanConverter.cs" />
     <Compile Include="System\Text\Json\Serialization\Converters\Value\ByteArrayConverter.cs" />
     <Compile Include="System\Text\Json\Serialization\Converters\Value\ByteConverter.cs" />
@@ -111,9 +116,10 @@
     <Compile Include="System\Text\Json\Serialization\DefaultReferenceResolver.cs" />
     <Compile Include="System\Text\Json\Serialization\JsonAttribute.cs" />
     <Compile Include="System\Text\Json\Serialization\JsonCamelCaseNamingPolicy.cs" />
-    <Compile Include="System\Text\Json\Serialization\JsonClassInfo.AddProperty.cs" />
     <Compile Include="System\Text\Json\Serialization\JsonClassInfo.cs" />
+    <Compile Include="System\Text\Json\Serialization\JsonClassInfo.Cache.cs" />
     <Compile Include="System\Text\Json\Serialization\JsonCollectionConverter.cs" />
+    <Compile Include="System\Text\Json\Serialization\JsonConstructorAttribute.cs" />
     <Compile Include="System\Text\Json\Serialization\JsonConverter.cs" />
     <Compile Include="System\Text\Json\Serialization\JsonConverter.ReadAhead.cs" />
     <Compile Include="System\Text\Json\Serialization\JsonConverterAttribute.cs" />
@@ -127,6 +133,8 @@
     <Compile Include="System\Text\Json\Serialization\JsonIgnoreAttribute.cs" />
     <Compile Include="System\Text\Json\Serialization\JsonNamingPolicy.cs" />
     <Compile Include="System\Text\Json\Serialization\JsonObjectConverter.cs" />
+    <Compile Include="System\Text\Json\Serialization\JsonParameterInfo.cs" />
+    <Compile Include="System\Text\Json\Serialization\JsonParameterInfoOfT.cs" />
     <Compile Include="System\Text\Json\Serialization\JsonPropertyInfo.cs" />
     <Compile Include="System\Text\Json\Serialization\JsonPropertyInfoOfTTypeToConvert.cs" />
     <Compile Include="System\Text\Json\Serialization\JsonPropertyNameAttribute.cs" />
@@ -151,6 +159,7 @@
     <Compile Include="System\Text\Json\Serialization\MemberAccessor.cs" />
     <Compile Include="System\Text\Json\Serialization\MetadataPropertyName.cs" />
     <Compile Include="System\Text\Json\Serialization\PooledByteBufferWriter.cs" />
+    <Compile Include="System\Text\Json\Serialization\ParameterRef.cs" />
     <Compile Include="System\Text\Json\Serialization\PropertyRef.cs" />
     <Compile Include="System\Text\Json\Serialization\ReadStack.cs" />
     <Compile Include="System\Text\Json\Serialization\ReadStackFrame.cs" />

src/libraries/System.Text.Json/src/System/Text/Json/JsonConstants.cs

@@ -98,5 +98,12 @@ internal static class JsonConstants
         public const int LowSurrogateStartValue = 0xDC00;
         public const int LowSurrogateEndValue = 0xDFFF;
         public const int BitShiftBy10 = 0x400;
+
+        // The maximum number of parameters a constructor can have where it can be considered
+        // for a path on deserialization where we don't box the constructor arguments.
+        public const int UnboxedParameterCountThreshold = 4;
+
+        // The maximum number of parameters a constructor can have where it can be supported.
+        public const int MaxParameterCount = 64;
     }
 }

src/libraries/System.Text.Json/src/System/Text/Json/Serialization/ArgumentState.cs

@@ -0,0 +1,35 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.Collections.Generic;
+
+using FoundProperties = System.ValueTuple<System.Text.Json.JsonPropertyInfo, System.Text.Json.JsonReaderState, long, byte[]?, string?>;
+using FoundPropertiesAsync = System.ValueTuple<System.Text.Json.JsonPropertyInfo, object?, string?>;
+
+namespace System.Text.Json
+{
+    /// <summary>
+    /// Holds relevant state when deserializing objects with parameterized constructors.
+    /// Lives on the current ReadStackFrame.
+    /// </summary>
+    internal class ArgumentState
+    {
+        // Cache for parsed constructor arguments.
+        public object Arguments = null!;
+
+        // When deserializing objects with parameterized ctors, the properties we find on the first pass.
+        public FoundProperties[]? FoundProperties;
+
+        // When deserializing objects with parameterized ctors asynchronously, the properties we find on the first pass.
+        public FoundPropertiesAsync[]? FoundPropertiesAsync;
+        public int FoundPropertyCount;
+
+        // Current constructor parameter value.
+        public JsonParameterInfo? JsonParameterInfo;
+
+        // For performance, we order the parameters by the first deserialize and PropertyIndex helps find the right slot quicker.
+        public int ParameterIndex;
+        public List<ParameterRef>? ParameterRefCache;
+    }
+}

src/libraries/System.Text.Json/src/System/Text/Json/Serialization/Arguments.cs

@@ -0,0 +1,18 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+namespace System.Text.Json
+{
+    /// <summary>
+    /// Constructor arguments for objects with parameterized ctors with less than 5 parameters.
+    /// This is to avoid boxing for small, immutable objects.
+    /// </summary>
+    internal sealed class Arguments<TArg0, TArg1, TArg2, TArg3>
+    {
+        public TArg0 Arg0 = default!;
+        public TArg1 Arg1 = default!;
+        public TArg2 Arg2 = default!;
+        public TArg3 Arg3 = default!;
+    }
+}

src/libraries/System.Text.Json/src/System/Text/Json/Serialization/Converters/Collection/ICollectionOfTConverter.cs

@@ -28,7 +28,7 @@ protected override void CreateCollection(ref ReadStack state, JsonSerializerOpti
             {
                 if (!TypeToConvert.IsAssignableFrom(RuntimeType))
                 {
-                    ThrowHelper.ThrowNotSupportedException_DeserializeNoParameterlessConstructor(TypeToConvert);
+                    ThrowHelper.ThrowNotSupportedException_DeserializeNoDeserializationConstructor(TypeToConvert);
                 }
 
                 state.Current.ReturnValue = new List<TElement>();
@@ -37,7 +37,7 @@ protected override void CreateCollection(ref ReadStack state, JsonSerializerOpti
             {
                 if (classInfo.CreateObject == null)
                 {
-                    ThrowHelper.ThrowNotSupportedException_DeserializeNoParameterlessConstructor(TypeToConvert);
+                    ThrowHelper.ThrowNotSupportedException_DeserializeNoDeserializationConstructor(TypeToConvert);
                 }
 
                 TCollection returnValue = (TCollection)classInfo.CreateObject()!;

src/libraries/System.Text.Json/src/System/Text/Json/Serialization/Converters/Collection/IDictionaryConverter.cs

@@ -32,7 +32,7 @@ protected override void CreateCollection(ref ReadStack state)
             {
                 if (!TypeToConvert.IsAssignableFrom(RuntimeType))
                 {
-                    ThrowHelper.ThrowNotSupportedException_DeserializeNoParameterlessConstructor(TypeToConvert);
+                    ThrowHelper.ThrowNotSupportedException_DeserializeNoDeserializationConstructor(TypeToConvert);
                 }
 
                 state.Current.ReturnValue = new Dictionary<string, object>();
@@ -41,7 +41,7 @@ protected override void CreateCollection(ref ReadStack state)
             {
                 if (classInfo.CreateObject == null)
                 {
-                    ThrowHelper.ThrowNotSupportedException_DeserializeNoParameterlessConstructor(TypeToConvert);
+                    ThrowHelper.ThrowNotSupportedException_DeserializeNoDeserializationConstructor(TypeToConvert);
                 }
 
                 TCollection returnValue = (TCollection)classInfo.CreateObject()!;

src/libraries/System.Text.Json/src/System/Text/Json/Serialization/Converters/Collection/IDictionaryOfStringTValueConverter.cs

@@ -31,7 +31,7 @@ protected override void CreateCollection(ref ReadStack state)
             {
                 if (!TypeToConvert.IsAssignableFrom(RuntimeType))
                 {
-                    ThrowHelper.ThrowNotSupportedException_DeserializeNoParameterlessConstructor(TypeToConvert);
+                    ThrowHelper.ThrowNotSupportedException_DeserializeNoDeserializationConstructor(TypeToConvert);
                 }
 
                 state.Current.ReturnValue = new Dictionary<string, TValue>();
@@ -40,7 +40,7 @@ protected override void CreateCollection(ref ReadStack state)
             {
                 if (classInfo.CreateObject == null)
                 {
-                    ThrowHelper.ThrowNotSupportedException_DeserializeNoParameterlessConstructor(TypeToConvert);
+                    ThrowHelper.ThrowNotSupportedException_DeserializeNoDeserializationConstructor(TypeToConvert);
                 }
 
                 TCollection returnValue = (TCollection)classInfo.CreateObject()!;

src/libraries/System.Text.Json/src/System/Text/Json/Serialization/Converters/Collection/IEnumerableConverter.cs

@@ -26,7 +26,7 @@ protected override void CreateCollection(ref ReadStack state, JsonSerializerOpti
         {
             if (!TypeToConvert.IsAssignableFrom(RuntimeType))
             {
-                ThrowHelper.ThrowNotSupportedException_DeserializeNoParameterlessConstructor(TypeToConvert);
+                ThrowHelper.ThrowNotSupportedException_DeserializeNoDeserializationConstructor(TypeToConvert);
             }
 
             state.Current.ReturnValue = new List<object?>();

src/libraries/System.Text.Json/src/System/Text/Json/Serialization/Converters/Collection/IEnumerableOfTConverter.cs

@@ -25,7 +25,7 @@ protected override void CreateCollection(ref ReadStack state, JsonSerializerOpti
         {
             if (!TypeToConvert.IsAssignableFrom(RuntimeType))
             {
-                ThrowHelper.ThrowNotSupportedException_DeserializeNoParameterlessConstructor(TypeToConvert);
+                ThrowHelper.ThrowNotSupportedException_DeserializeNoDeserializationConstructor(TypeToConvert);
             }
 
             state.Current.ReturnValue = new List<TElement>();

src/libraries/System.Text.Json/src/System/Text/Json/Serialization/Converters/Collection/IEnumerableWithAddMethodConverter.cs

@@ -24,7 +24,7 @@ protected override void CreateCollection(ref ReadStack state, JsonSerializerOpti
 
             if (constructorDelegate == null)
             {
-                ThrowHelper.ThrowNotSupportedException_DeserializeNoParameterlessConstructor(TypeToConvert);
+                ThrowHelper.ThrowNotSupportedException_DeserializeNoDeserializationConstructor(TypeToConvert);
             }
 
             state.Current.ReturnValue = constructorDelegate();

src/libraries/System.Text.Json/src/System/Text/Json/Serialization/Converters/Collection/IListConverter.cs

@@ -27,7 +27,7 @@ protected override void CreateCollection(ref ReadStack state, JsonSerializerOpti
             {
                 if (!TypeToConvert.IsAssignableFrom(RuntimeType))
                 {
-                    ThrowHelper.ThrowNotSupportedException_DeserializeNoParameterlessConstructor(TypeToConvert);
+                    ThrowHelper.ThrowNotSupportedException_DeserializeNoDeserializationConstructor(TypeToConvert);
                 }
 
                 state.Current.ReturnValue = new List<object?>();
@@ -36,7 +36,7 @@ protected override void CreateCollection(ref ReadStack state, JsonSerializerOpti
             {
                 if (classInfo.CreateObject == null)
                 {
-                    ThrowHelper.ThrowNotSupportedException_DeserializeNoParameterlessConstructor(TypeToConvert);
+                    ThrowHelper.ThrowNotSupportedException_DeserializeNoDeserializationConstructor(TypeToConvert);
                 }
 
                 TCollection returnValue = (TCollection)classInfo.CreateObject()!;

src/libraries/System.Text.Json/src/System/Text/Json/Serialization/Converters/Collection/IListOfTConverter.cs

@@ -28,7 +28,7 @@ protected override void CreateCollection(ref ReadStack state, JsonSerializerOpti
             {
                 if (!TypeToConvert.IsAssignableFrom(RuntimeType))
                 {
-                    ThrowHelper.ThrowNotSupportedException_DeserializeNoParameterlessConstructor(TypeToConvert);
+                    ThrowHelper.ThrowNotSupportedException_DeserializeNoDeserializationConstructor(TypeToConvert);
                 }
 
                 state.Current.ReturnValue = new List<TElement>();
@@ -37,7 +37,7 @@ protected override void CreateCollection(ref ReadStack state, JsonSerializerOpti
             {
                 if (classInfo.CreateObject == null)
                 {
-                    ThrowHelper.ThrowNotSupportedException_DeserializeNoParameterlessConstructor(TypeToConvert);
+                    ThrowHelper.ThrowNotSupportedException_DeserializeNoDeserializationConstructor(TypeToConvert);
                 }
 
                 TCollection returnValue = (TCollection)classInfo.CreateObject()!;

src/libraries/System.Text.Json/src/System/Text/Json/Serialization/Converters/Collection/IReadOnlyDictionaryOfStringTValueConverter.cs

@@ -23,7 +23,7 @@ protected override void CreateCollection(ref ReadStack state)
         {
             if (!TypeToConvert.IsAssignableFrom(RuntimeType))
             {
-                ThrowHelper.ThrowNotSupportedException_DeserializeNoParameterlessConstructor(TypeToConvert);
+                ThrowHelper.ThrowNotSupportedException_DeserializeNoDeserializationConstructor(TypeToConvert);
             }
 
             state.Current.ReturnValue = new Dictionary<string, TValue>();

src/libraries/System.Text.Json/src/System/Text/Json/Serialization/Converters/Collection/ISetOfTConverter.cs

@@ -25,7 +25,7 @@ protected override void CreateCollection(ref ReadStack state, JsonSerializerOpti
             {
                 if (!TypeToConvert.IsAssignableFrom(RuntimeType))
                 {
-                    ThrowHelper.ThrowNotSupportedException_DeserializeNoParameterlessConstructor(TypeToConvert);
+                    ThrowHelper.ThrowNotSupportedException_DeserializeNoDeserializationConstructor(TypeToConvert);
                 }
 
                 state.Current.ReturnValue = new HashSet<TElement>();
@@ -34,7 +34,7 @@ protected override void CreateCollection(ref ReadStack state, JsonSerializerOpti
             {
                 if (classInfo.CreateObject == null)
                 {
-                    ThrowHelper.ThrowNotSupportedException_DeserializeNoParameterlessConstructor(TypeToConvert);
+                    ThrowHelper.ThrowNotSupportedException_DeserializeNoDeserializationConstructor(TypeToConvert);
                 }
 
                 TCollection returnValue = (TCollection)classInfo.CreateObject()!;