namespace System.Diagnostics
{
    public abstract class DistributedContextPropagator
    {
        public delegate void PropagatorGetterCallback(object? carrier, string! fieldName, out string? fieldValue, out IEnumerable<string!>? fieldValues);
        {
            public virtual void EndInvoke(out string? fieldValue, out IEnumerable<string!>? fieldValues, IAsyncResult result);
        }
    }
}