SmallObjectWithParameterizedConstructorConverter<T, TArg0, TArg1, TArg2, TArg3>
class SmallObjectWithParameterizedConstructorConverter<T, TArg0, TArg1, TArg2, TArg3> : ObjectWithParameterizedConstructorConverter<T>
Implementation of JsonObjectConverter{T} that supports the deserialization
of JSON objects using parameterized constructors.
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.Runtime.CompilerServices;
using System.Text.Json.Serialization.Metadata;
namespace System.Text.Json.Serialization.Converters
{
internal class SmallObjectWithParameterizedConstructorConverter<T, TArg0, TArg1, TArg2, TArg3> : ObjectWithParameterizedConstructorConverter<T>
{
protected override object CreateObject(ref ReadStackFrame frame)
{
JsonTypeInfo.ParameterizedConstructorDelegate<T, TArg0, TArg1, TArg2, TArg3> parameterizedConstructorDelegate = (JsonTypeInfo.ParameterizedConstructorDelegate<T, TArg0, TArg1, TArg2, TArg3>)frame.JsonTypeInfo.CreateObjectWithArgs;
Arguments<TArg0, TArg1, TArg2, TArg3> arguments = (Arguments<TArg0, TArg1, TArg2, TArg3>)frame.CtorArgumentState.Arguments;
return parameterizedConstructorDelegate(arguments.Arg0, arguments.Arg1, arguments.Arg2, arguments.Arg3);
}
protected override bool ReadAndCacheConstructorArgument([System.Runtime.CompilerServices.ScopedRef] ref ReadStack state, ref Utf8JsonReader reader, JsonParameterInfo jsonParameterInfo)
{
Arguments<TArg0, TArg1, TArg2, TArg3> arguments = (Arguments<TArg0, TArg1, TArg2, TArg3>)state.Current.CtorArgumentState.Arguments;
switch (jsonParameterInfo.Position) {
case 0:
return TryRead(ref state, ref reader, jsonParameterInfo, out arguments.Arg0);
case 1:
return TryRead(ref state, ref reader, jsonParameterInfo, out arguments.Arg1);
case 2:
return TryRead(ref state, ref reader, jsonParameterInfo, out arguments.Arg2);
case 3:
return TryRead(ref state, ref reader, jsonParameterInfo, out arguments.Arg3);
default:
throw new InvalidOperationException();
}
}
private static bool TryRead<TArg>([System.Runtime.CompilerServices.ScopedRef] ref ReadStack state, ref Utf8JsonReader reader, JsonParameterInfo jsonParameterInfo, out TArg arg)
{
JsonParameterInfo<TArg> jsonParameterInfo2 = (JsonParameterInfo<TArg>)jsonParameterInfo;
TArg value;
bool flag = jsonParameterInfo2.EffectiveConverter.TryRead(ref reader, jsonParameterInfo2.ParameterType, jsonParameterInfo2.Options, ref state, out value);
arg = ((value == null && jsonParameterInfo.IgnoreNullTokensOnRead) ? jsonParameterInfo2.DefaultValue : value);
if (flag)
state.Current.MarkRequiredPropertyAsRead(jsonParameterInfo.MatchingProperty);
return flag;
}
protected override void InitializeConstructorArgumentCaches(ref ReadStack state, JsonSerializerOptions options)
{
JsonTypeInfo jsonTypeInfo = state.Current.JsonTypeInfo;
Arguments<TArg0, TArg1, TArg2, TArg3> arguments = new Arguments<TArg0, TArg1, TArg2, TArg3>();
List<KeyValuePair<string, JsonParameterInfo>> list = jsonTypeInfo.ParameterCache.List;
for (int i = 0; i < jsonTypeInfo.ParameterCount; i++) {
JsonParameterInfo value = list[i].Value;
switch (value.Position) {
case 0:
arguments.Arg0 = ((JsonParameterInfo<TArg0>)value).DefaultValue;
break;
case 1:
arguments.Arg1 = ((JsonParameterInfo<TArg1>)value).DefaultValue;
break;
case 2:
arguments.Arg2 = ((JsonParameterInfo<TArg2>)value).DefaultValue;
break;
case 3:
arguments.Arg3 = ((JsonParameterInfo<TArg3>)value).DefaultValue;
break;
default:
throw new InvalidOperationException();
}
}
state.Current.CtorArgumentState.Arguments = arguments;
}
[System.Diagnostics.CodeAnalysis.RequiresUnreferencedCode("JSON serialization and deserialization might require types that cannot be statically analyzed. Use the overload that takes a JsonTypeInfo or JsonSerializerContext, or make sure all of the required types are preserved.")]
[System.Diagnostics.CodeAnalysis.RequiresDynamicCode("JSON serialization and deserialization might require types that cannot be statically analyzed and might need runtime code generation. Use System.Text.Json source generation for native AOT applications.")]
internal override void ConfigureJsonTypeInfoUsingReflection(JsonTypeInfo jsonTypeInfo, JsonSerializerOptions options)
{
jsonTypeInfo.CreateObjectWithArgs = DefaultJsonTypeInfoResolver.MemberAccessor.CreateParameterizedConstructor<T, TArg0, TArg1, TArg2, TArg3>(base.ConstructorInfo);
}
}
}