Issues with a struct type when calling TaskOrchestrationContext getInput - Guids are empty

Question

Hello,

Trying to migrate a code from .NET6 to .NET8, isolated worker model, I have noticed that: if the orchestrator has a struct type parameter having a Guid field, getting the input from the orchestrator, with context.GetInput<T>(), results in an empty Guid.

<PackageReference Include="Microsoft.Azure.Functions.Worker" Version="1.22.0" />
<PackageReference Include="Microsoft.Azure.Functions.Worker.Extensions.DurableTask" Version="1.1.4" />
<PackageReference Include="Microsoft.Azure.Functions.Worker.Sdk" Version="1.15.0" />

In Program.cs, I have this line: services.Configure<JsonSerializerOptions>(o => o.IncludeFields = true);

public class Message
{
	public InputModel Id { get; set; }
}

public struct InputModel
{
    public Guid Id { get; }
    public InputModel(Guid value) => Id = value;
    public static InputModel FromString(string value) => new InputModel(Guid.Parse(value));
}
     
//this is how the orchestrator is called     
     await client.ScheduleNewOrchestrationInstanceAsync(
         nameof(MyOrchestrator),
         new Message
           {
              Id = InputModel.FromString(data)
           },
         new StartOrchestrationOptions { InstanceId = rowKey });
            
//in the orchestrator, trying to get the Message        
    var message = ctx.GetInput<Message>();
//the message contains an empty Guid

Answer 1

I have found the issue: the InputModel struct should be serialized correctly.

public class Message
{
public InputModel Id { get; set; }
}
[JsonConverter(typeof(InputModelConverter))]
public struct InputModel
{
public Guid Id { get; }
public InputModel(Guid value) => Id = value;
public static InputModel FromString(string value) => new InputModel(Guid.Parse(value));
}
public class InputModelConverter : JsonConverter<InputModel>
{
    public override InputModel Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
    {
        // Assuming the JSON value is a simple string that can be parsed as a Guid
        if (reader.TokenType != JsonTokenType.String)
        {
            throw new JsonException("Expected a string value.");
        }
        string guidString = reader.GetString();
        if (!Guid.TryParse(guidString, out Guid guidValue))
        {
            throw new JsonException("The string value is not a valid GUID.");
        }
        return InputModel.FromString(guidValue.ToString());
    }
    public override void Write(Utf8JsonWriter writer, InputModel value, JsonSerializerOptions options)
    {
        // Serialize the InputModel instance's Id as a string
        writer.WriteStringValue(value.Id.ToString());
    }
}
} 
//this is how the orchestrator is called     
 await client.ScheduleNewOrchestrationInstanceAsync(
     nameof(MyOrchestrator),
     new Message
       {
          Id = InputModel.FromString(data)
       },
     new StartOrchestrationOptions { InstanceId = rowKey });
//in the orchestrator, trying to get the Message        
var message = ctx.GetInput<Message>();
//the message contains the correct Guid now