protobuf-net是否支持C#9位置记录类型？

c#

我正在尝试将 protobuf-net 与 C# 位置记录类型一起使用，但我遇到了这个异常：

10:18:48.048 [EROR] #010 (Microsoft.AspNetCore.Server.Kestrel) Connection id ""0HM4NDHMUB3C6"", Request id ""0HM4NDHMUB3C6:00000003"": An unhandled exception was thrown by the application.
Grpc.Core.RpcException: Status(StatusCode="Internal", Detail="Error starting gRPC call. ProtoException: No parameterless constructor found for Bidirectional.Demo.Common.Contracts.Server.GetServerProcessI
nfo.GetServerProcessInfoResponse", DebugException="ProtoBuf.ProtoException: No parameterless constructor found for Bidirectional.Demo.Common.Contracts.Server.GetServerProcessInfo.GetServerProcessInfoResp
onse
   at ProtoBuf.Internal.ThrowHelper.ThrowProtoException(String message, Exception inner) in /_/src/protobuf-net.Core/Internal/ThrowHelper.cs:line 70
   at ProtoBuf.Meta.TypeModel.ThrowCannotCreateInstance(Type type, Exception inner) in /_/src/protobuf-net.Core/Meta/TypeModel.cs:line 1666
   at proto_12(State& , GetServerProcessInfoResponse )
   at ProtoBuf.Internal.Serializers.SimpleCompiledSerializer`1.ProtoBuf.Serializers.ISerializer<T>.Read(State& state, T value)
   at ProtoBuf.ProtoReader.State.ReadAsRoot[T](T value, ISerializer`1 serializer)
   at ProtoBuf.ProtoReader.State.DeserializeRoot[T](T value, ISerializer`1 serializer)
   at ProtoBuf.Meta.TypeModel.Deserialize[T](ReadOnlySequence`1 source, T value, Object userState)
   at ProtoBuf.Grpc.Configuration.ProtoBufMarshallerFactory.ContextualDeserialize[T](DeserializationContext context)

这是 GetServerProcessInfoResponse 的样子：

[ProtoContract]
public record GetServerProcessInfoResponse(
    [property: ProtoMember(1)] TimeSpan TotalProcessorTime,
    [property: ProtoMember(2)] TimeSpan UserProcessorTime,
    [property: ProtoMember(3)] TimeSpan PrivilegedProcessorTime,
    [property: ProtoMember(4)] string CurrentMemoryUsage,
    [property: ProtoMember(5)] string PeakMemoryUsage,
    [property: ProtoMember(6)] int ActiveThreads
);

如果我将 GetServerProcessInfoResponse 更改为具有 gettable 和 settable 属性的常规 C# 类，则代码工作正常。然而，我希望记录也可以工作，因为它们避免了大量的可空性警告。例如，System.Text.Json 支持反序列化记录，这必须克服相同的限制。

我在文档、问题或 StackOverflow 上找不到任何内容，所以也许我不擅长搜索，或者答案还没有出来。:-)

protobuf-net 存储库似乎也没有任何尝试序列化/反序列化 ac# 记录的单元测试，它只包含“RecordTypeTests”，它似乎在检查是否可以克隆记录？

回答

[ProtoContract(SkipConstructor = true)]
public record GetServerProcessInfoResponse(
    [property: ProtoMember(1)] TimeSpan TotalProcessorTime,
    [property: ProtoMember(2)] TimeSpan UserProcessorTime,
    [property: ProtoMember(3)] TimeSpan PrivilegedProcessorTime,
    [property: ProtoMember(4)] string CurrentMemoryUsage,
    [property: ProtoMember(5)] string PeakMemoryUsage,
    [property: ProtoMember(6)] int ActiveThreads
);

public record GetServerProcessInfoResponse(
    TimeSpan TotalProcessorTime,
    TimeSpan UserProcessorTime,
    TimeSpan PrivilegedProcessorTime,
    string CurrentMemoryUsage,
    string PeakMemoryUsage,
    int ActiveThreads
);