奥尔良私有财产反序列化

Question

I have an orleans project with a stateful grain.

Orleans seems to not deserialize private properties when hydrating the state for the grain.

In the image below UserId gets deserialized but not State.

Is there a way to get around this?

Answer 1

You can override the default GrainStorageSerializer to use System.Text.Json which allows properties with private setters to be deserialized when you apply the JsonInclude attribute to the property as shown below.

public class Order
{
    [JsonInclude]
    public OrderStates State{ get; private set; }
}

You can then do the follow setup when configuring your environment. Implement a version of IGrainStorageSerializer that uses System.Text.Json . In this case below I created SystemTextJsonSerializer which implements the interface.

public class SystemTextJsonSerializer : IGrainStorageSerializer
{
    public BinaryData Serialize<T>(T input)
    {
        return new BinaryData(JsonSerializer.SerializeToUtf8Bytes(input));
    }

    public T Deserialize<T>(BinaryData input)
    {
        return input.ToObjectFromJson<T>();
    }
}

You can then configure your GrainStorageSerializer as below.

siloBuilder.Services.AddSerializer(serializerBuilder =>
    {
        serializerBuilder.AddJsonSerializer(isSupported: type => type.Namespace.StartsWith("Example.Domain"));
    });
        
.AddAzureTableGrainStorage(
    name: "OrleansProvider",
    configureOptions: options =>
    {
        options.GrainStorageSerializer = new SystemTextJsonSerializer();
        options.ConfigureTableServiceClient("...");
    });
       

Answer 2

You can make the grain's state a separate serializable object with public properties and let Orleans inject it as an IPersistentState into your grain's constructor like explained in Grain persistence on Microsoft Learn in the Get started section.

Keep in mind that you can't use the actual state data in the grain's constructor.
Implement OnActivateAsync if you need to do extra housekeeping using state data before the first message gets dispatched to your grain.