Json source generator should support JsonConverter on non-nullable and nullable types #66547
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area-System.Text.Json
bug
help wanted
[up-for-grabs] Good issue for external contributors
source-generator
Indicates an issue with a source generator feature
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Tagging subscribers to this area: @dotnet/area-system-text-json Issue DetailsDescriptionI have a custom JsonConverter like I have to create 2 converters Reproduction Stepsusing System.Text.Json;
using System.Text.Json.Serialization;
Console.WriteLine(JsonSerializer.Serialize(new Sample()));
class Sample
{
[JsonConverter(typeof(DateTimeOffsetToTimestampJsonConverter))]
public DateTimeOffset Start { get; set; }
[JsonConverter(typeof(DateTimeOffsetToTimestampJsonConverter))]
public DateTimeOffset? End { get; set; } // Without this property, this is fine
}
class DateTimeOffsetToTimestampJsonConverter : JsonConverter<DateTimeOffset>
{
internal const long TicksPerMicroseconds = 10;
public override DateTimeOffset Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
{
var value = reader.GetInt64();
return new DateTimeOffset(value * TicksPerMicroseconds, TimeSpan.Zero);
}
public override void Write(Utf8JsonWriter writer, DateTimeOffset value, JsonSerializerOptions options)
{
writer.WriteNumberValue(value.Ticks / TicksPerMicroseconds);
}
}
[JsonSourceGenerationOptions]
[JsonSerializable(typeof(Sample))]
internal sealed partial class SourceGenerationContext : JsonSerializerContext
{
}Expected behaviorI can use the json source generator without compilation errors. Actual behavior
Regression?No response Known WorkaroundsUse 2 different converters, one for non-nullable values and one for nullable values. ConfigurationOther informationNo response
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This was referenced Oct 13, 2022
25 tasks
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Interesting note, you can override the default options (not sure how safe this is but it works, would be nice to have an extensible method for this instead, but I digress) that will let your source generator work for the majority of scenarios. [JsonSourceGenerationOptions(DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull, PropertyNamingPolicy = JsonKnownNamingPolicy.CamelCase)]
[JsonSerializable(typeof(MyObject))]
public partial class MyJsonSerializerContext : JsonSerializerContext
{
static MyJsonSerializerContext()
{
s_defaultOptions.Converters.Add(new JsonStringEnumConverter());
}
} |
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Hi @layomia
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If anything was fixed, it was probably done accidentally. Before closing we should at least add testing validating that the scenario works. |
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@pedrobsaila I don't believe that the issue has been addressed. Even though the changes in #86526 mean that the code now compiles, the example will still fail at run time with a cast exception. |
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Description
I have a custom JsonConverter like
CustomConverter : JsonConverter<DateTime>. Without the source generator I can use the custom converter forDateTimeandDateTime?properties. Using the source generator, the generated code doesn't compile for nullable properties.I have to create 2 converters
CustomConverter : JsonConverter<DateTime>andNullableCustomConverter : JsonConverter<DateTime?>.Reproduction Steps
Expected behavior
I can use the json source generator without compilation errors.
Actual behavior
Regression?
No response
Known Workarounds
Use 2 different converters, one for non-nullable values and one for nullable values.
Configuration
Other information
No response
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