<PackageReference Include="System.ServiceModel.Primitives" Version="10.0.652802" />

System.ServiceModel.MessageHeader<T>

public class MessageHeader<T>
namespace System.ServiceModel { public class MessageHeader<T> { public string Actor { get; set; } public T Content { get; set; } public bool MustUnderstand { get; set; } public bool Relay { get; set; } public MessageHeader(); public MessageHeader(T content); public MessageHeader(T content, bool mustUnderstand, string actor, bool relay); public MessageHeader GetUntypedHeader(string name, string ns); } }