Signalr - Aspnetcore

Polymorphic type support in SignalR Hubs

Hub methods can now accept a base class instead of the derived class to enable polymorphic scenarios. The base type needs to be annotated to allow polymorphism.

csharp

public class MyHub : Hub
{
    public void Method(JsonPerson person)
    {
        if (person is JsonPersonExtended)
        {
        }
        else if (person is JsonPersonExtended2)
        {
        }
        else
        {
        }
    }
}

[JsonPolymorphic]
[JsonDerivedType(typeof(JsonPersonExtended), nameof(JsonPersonExtended))]
[JsonDerivedType(typeof(JsonPersonExtended2), nameof(JsonPersonExtended2))]
private class JsonPerson
{
    public string Name { get; set; }
    public Person Child { get; set; }
    public Person Parent { get; set; }
}

private class JsonPersonExtended : JsonPerson
{
    public int Age { get; set; }
}

private class JsonPersonExtended2 : JsonPerson
{
    public string Location { get; set; }
}