ReferenceHandler.cs

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namespace System.Text.Json.Serialization;
 
public abstract class ReferenceHandler
{
    internal ReferenceHandlingStrategy HandlingStrategy = ReferenceHandlingStrategy.Preserve;
 
    public static ReferenceHandler Preserve { get; } = new PreserveReferenceHandler();
 
 
    public static ReferenceHandler IgnoreCycles { get; } = new IgnoreReferenceHandler();
 
 
    public abstract ReferenceResolver CreateResolver();
 
    internal virtual ReferenceResolver CreateResolver(bool writing)
    {
        return CreateResolver();
    }
}
public sealed class ReferenceHandler<T> : ReferenceHandler where T : ReferenceResolver, new()
{
    public override ReferenceResolver CreateResolver()
    {
        return new T();
    }
}