internal override bool OnTryRead(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options, ref ReadStack state, [MaybeNullWhen(false)] out T value)
{
JsonTypeInfo jsonTypeInfo = state.Current.JsonTypeInfo;
object obj;
if (state.UseFastPath)
{
// Fast path that avoids maintaining state variables and dealing with preserved references.
if (reader.TokenType != JsonTokenType.StartObject)
{
ThrowHelper.ThrowJsonException_DeserializeUnableToConvertValue(TypeToConvert);
}
if (jsonTypeInfo.CreateObject == null)
{
ThrowHelper.ThrowNotSupportedException_DeserializeNoConstructor(jsonTypeInfo.Type, ref reader, ref state);
}
obj = jsonTypeInfo.CreateObject !() !;
if (obj is IJsonOnDeserializing onDeserializing)
{
onDeserializing.OnDeserializing();
}
// Process all properties.
while (true)
{
// Read the property name or EndObject.
reader.ReadWithVerify();
JsonTokenType tokenType = reader.TokenType;
if (tokenType == JsonTokenType.EndObject)
{
break;
}
// Read method would have thrown if otherwise.
Debug.Assert(tokenType == JsonTokenType.PropertyName);
ReadOnlySpan <byte> unescapedPropertyName = JsonSerializer.GetPropertyName(ref state, ref reader, options);
JsonPropertyInfo jsonPropertyInfo = JsonSerializer.LookupProperty(
obj,
unescapedPropertyName,
ref state,
options,
out bool useExtensionProperty);
ReadPropertyValue(obj, ref state, ref reader, jsonPropertyInfo, useExtensionProperty);
}
}
else
{
// Slower path that supports continuation and preserved references.
if (state.Current.ObjectState == StackFrameObjectState.None)
{
if (reader.TokenType != JsonTokenType.StartObject)
{
ThrowHelper.ThrowJsonException_DeserializeUnableToConvertValue(TypeToConvert);
}
state.Current.ObjectState = StackFrameObjectState.StartToken;
}
// Handle the metadata properties.
if (state.Current.ObjectState < StackFrameObjectState.PropertyValue)
{
if (options.ReferenceHandlingStrategy == ReferenceHandlingStrategy.Preserve)
{
if (JsonSerializer.ResolveMetadataForJsonObject <T>(ref reader, ref state, options))
{
if (state.Current.ObjectState == StackFrameObjectState.ReadRefEndObject)
{
// This will never throw since it was previously validated in ResolveMetadataForJsonObject.
value = (T)state.Current.ReturnValue !;
return(true);
}
}
else
{
value = default;
return(false);
}
}
}
if (state.Current.ObjectState < StackFrameObjectState.CreatedObject)
{
if (jsonTypeInfo.CreateObject == null)
{
ThrowHelper.ThrowNotSupportedException_DeserializeNoConstructor(jsonTypeInfo.Type, ref reader, ref state);
}
obj = jsonTypeInfo.CreateObject !() !;
if (obj is IJsonOnDeserializing onDeserializing)
{
onDeserializing.OnDeserializing();
}
state.Current.ReturnValue = obj;
state.Current.ObjectState = StackFrameObjectState.CreatedObject;
}
else
{
obj = state.Current.ReturnValue !;
Debug.Assert(obj != null);
}
// Process all properties.
while (true)
{
// Determine the property.
if (state.Current.PropertyState == StackFramePropertyState.None)
{
state.Current.PropertyState = StackFramePropertyState.ReadName;
if (!reader.Read())
{
// The read-ahead functionality will do the Read().
state.Current.ReturnValue = obj;
value = default;
return(false);
}
}
JsonPropertyInfo jsonPropertyInfo;
if (state.Current.PropertyState < StackFramePropertyState.Name)
{
state.Current.PropertyState = StackFramePropertyState.Name;
JsonTokenType tokenType = reader.TokenType;
if (tokenType == JsonTokenType.EndObject)
{
break;
}
// Read method would have thrown if otherwise.
Debug.Assert(tokenType == JsonTokenType.PropertyName);
ReadOnlySpan <byte> unescapedPropertyName = JsonSerializer.GetPropertyName(ref state, ref reader, options);
jsonPropertyInfo = JsonSerializer.LookupProperty(
obj,
unescapedPropertyName,
ref state,
options,
out bool useExtensionProperty);
state.Current.UseExtensionProperty = useExtensionProperty;
}
else
{
Debug.Assert(state.Current.JsonPropertyInfo != null);
jsonPropertyInfo = state.Current.JsonPropertyInfo !;
}
if (state.Current.PropertyState < StackFramePropertyState.ReadValue)
{
if (!jsonPropertyInfo.ShouldDeserialize)
{
if (!reader.TrySkip())
{
state.Current.ReturnValue = obj;
value = default;
return(false);
}
state.Current.EndProperty();
continue;
}
if (!ReadAheadPropertyValue(ref state, ref reader, jsonPropertyInfo))
{
state.Current.ReturnValue = obj;
value = default;
return(false);
}
}
if (state.Current.PropertyState < StackFramePropertyState.TryRead)
{
// Obtain the CLR value from the JSON and set the member.
if (!state.Current.UseExtensionProperty)
{
if (!jsonPropertyInfo.ReadJsonAndSetMember(obj, ref state, ref reader))
{
state.Current.ReturnValue = obj;
value = default;
return(false);
}
}
else
{
if (!jsonPropertyInfo.ReadJsonAndAddExtensionProperty(obj, ref state, ref reader))
{
// No need to set 'value' here since JsonElement must be read in full.
state.Current.ReturnValue = obj;
value = default;
return(false);
}
}
state.Current.EndProperty();
}
}
}
if (obj is IJsonOnDeserialized onDeserialized)
{
onDeserialized.OnDeserialized();
}
// Unbox
Debug.Assert(obj != null);
value = (T)obj;
// Check if we are trying to build the sorted cache.
if (state.Current.PropertyRefCache != null)
{
jsonTypeInfo.UpdateSortedPropertyCache(ref state.Current);
}
return(true);
}
internal override bool OnTryRead(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options, ref ReadStack state, [MaybeNullWhen(false)] out T value)
{
JsonTypeInfo jsonTypeInfo = state.Current.JsonTypeInfo;
object obj;
if (!state.SupportContinuation && !state.Current.CanContainMetadata)
{
// Fast path that avoids maintaining state variables and dealing with preserved references.
if (reader.TokenType != JsonTokenType.StartObject)
{
ThrowHelper.ThrowJsonException_DeserializeUnableToConvertValue(TypeToConvert);
}
if (jsonTypeInfo.CreateObject == null)
{
ThrowHelper.ThrowNotSupportedException_DeserializeNoConstructor(jsonTypeInfo.Type, ref reader, ref state);
}
obj = jsonTypeInfo.CreateObject !() !;
if (obj is IJsonOnDeserializing onDeserializing)
{
onDeserializing.OnDeserializing();
}
// Process all properties.
while (true)
{
// Read the property name or EndObject.
reader.ReadWithVerify();
JsonTokenType tokenType = reader.TokenType;
if (tokenType == JsonTokenType.EndObject)
{
break;
}
// Read method would have thrown if otherwise.
Debug.Assert(tokenType == JsonTokenType.PropertyName);
ReadOnlySpan <byte> unescapedPropertyName = JsonSerializer.GetPropertyName(ref state, ref reader, options);
JsonPropertyInfo jsonPropertyInfo = JsonSerializer.LookupProperty(
obj,
unescapedPropertyName,
ref state,
options,
out bool useExtensionProperty);
ReadPropertyValue(obj, ref state, ref reader, jsonPropertyInfo, useExtensionProperty);
}
}
else
{
// Slower path that supports continuation and reading metadata.
if (state.Current.ObjectState == StackFrameObjectState.None)
{
if (reader.TokenType != JsonTokenType.StartObject)
{
ThrowHelper.ThrowJsonException_DeserializeUnableToConvertValue(TypeToConvert);
}
state.Current.ObjectState = StackFrameObjectState.StartToken;
}
// Handle the metadata properties.
if (state.Current.CanContainMetadata && state.Current.ObjectState < StackFrameObjectState.ReadMetadata)
{
if (!JsonSerializer.TryReadMetadata(this, jsonTypeInfo, ref reader, ref state))
{
value = default;
return(false);
}
if (state.Current.MetadataPropertyNames == MetadataPropertyName.Ref)
{
value = JsonSerializer.ResolveReferenceId <T>(ref state);
return(true);
}
state.Current.ObjectState = StackFrameObjectState.ReadMetadata;
}
// Dispatch to any polymorphic converters: should always be entered regardless of ObjectState progress
if (state.Current.MetadataPropertyNames.HasFlag(MetadataPropertyName.Type) &&
state.Current.PolymorphicSerializationState != PolymorphicSerializationState.PolymorphicReEntryStarted &&
ResolvePolymorphicConverter(jsonTypeInfo, options, ref state) is JsonConverter polymorphicConverter)
{
Debug.Assert(!IsValueType);
bool success = polymorphicConverter.OnTryReadAsObject(ref reader, options, ref state, out object?objectResult);
value = (T)objectResult !;
state.ExitPolymorphicConverter(success);
return(success);
}
if (state.Current.ObjectState < StackFrameObjectState.CreatedObject)
{
if (state.Current.CanContainMetadata)
{
JsonSerializer.ValidateMetadataForObjectConverter(this, ref reader, ref state);
}
if (state.Current.MetadataPropertyNames == MetadataPropertyName.Ref)
{
value = JsonSerializer.ResolveReferenceId <T>(ref state);
return(true);
}
if (jsonTypeInfo.CreateObject == null)
{
ThrowHelper.ThrowNotSupportedException_DeserializeNoConstructor(jsonTypeInfo.Type, ref reader, ref state);
}
obj = jsonTypeInfo.CreateObject !() !;
if (state.Current.MetadataPropertyNames.HasFlag(MetadataPropertyName.Id))
{
Debug.Assert(state.ReferenceId != null);
Debug.Assert(options.ReferenceHandlingStrategy == ReferenceHandlingStrategy.Preserve);
state.ReferenceResolver.AddReference(state.ReferenceId, obj);
state.ReferenceId = null;
}
if (obj is IJsonOnDeserializing onDeserializing)
{
onDeserializing.OnDeserializing();
}
state.Current.ReturnValue = obj;
state.Current.ObjectState = StackFrameObjectState.CreatedObject;
}
else
{
obj = state.Current.ReturnValue !;
Debug.Assert(obj != null);
}
// Process all properties.
while (true)
{
// Determine the property.
if (state.Current.PropertyState == StackFramePropertyState.None)
{
state.Current.PropertyState = StackFramePropertyState.ReadName;
if (!reader.Read())
{
// The read-ahead functionality will do the Read().
state.Current.ReturnValue = obj;
value = default;
return(false);
}
}
JsonPropertyInfo jsonPropertyInfo;
if (state.Current.PropertyState < StackFramePropertyState.Name)
{
state.Current.PropertyState = StackFramePropertyState.Name;
JsonTokenType tokenType = reader.TokenType;
if (tokenType == JsonTokenType.EndObject)
{
break;
}
// Read method would have thrown if otherwise.
Debug.Assert(tokenType == JsonTokenType.PropertyName);
ReadOnlySpan <byte> unescapedPropertyName = JsonSerializer.GetPropertyName(ref state, ref reader, options);
jsonPropertyInfo = JsonSerializer.LookupProperty(
obj,
unescapedPropertyName,
ref state,
options,
out bool useExtensionProperty);
state.Current.UseExtensionProperty = useExtensionProperty;
}
else
{
Debug.Assert(state.Current.JsonPropertyInfo != null);
jsonPropertyInfo = state.Current.JsonPropertyInfo !;
}
if (state.Current.PropertyState < StackFramePropertyState.ReadValue)
{
if (!jsonPropertyInfo.ShouldDeserialize)
{
if (!reader.TrySkip())
{
state.Current.ReturnValue = obj;
value = default;
return(false);
}
state.Current.EndProperty();
continue;
}
if (!ReadAheadPropertyValue(ref state, ref reader, jsonPropertyInfo))
{
state.Current.ReturnValue = obj;
value = default;
return(false);
}
}
if (state.Current.PropertyState < StackFramePropertyState.TryRead)
{
// Obtain the CLR value from the JSON and set the member.
if (!state.Current.UseExtensionProperty)
{
if (!jsonPropertyInfo.ReadJsonAndSetMember(obj, ref state, ref reader))
{
state.Current.ReturnValue = obj;
value = default;
return(false);
}
}
else
{
if (!jsonPropertyInfo.ReadJsonAndAddExtensionProperty(obj, ref state, ref reader))
{
// No need to set 'value' here since JsonElement must be read in full.
state.Current.ReturnValue = obj;
value = default;
return(false);
}
}
state.Current.EndProperty();
}
}
}
if (obj is IJsonOnDeserialized onDeserialized)
{
onDeserialized.OnDeserialized();
}
// Unbox
Debug.Assert(obj != null);
value = (T)obj;
// Check if we are trying to build the sorted cache.
if (state.Current.PropertyRefCache != null)
{
jsonTypeInfo.UpdateSortedPropertyCache(ref state.Current);
}
return(true);
}
