Discord.Net/src/Discord.Net.WebSocket/Entities/Messages/SocketSystemMessage.cs

using System.Diagnostics;
using Model = Discord.API.Message;

namespace Discord.WebSocket
{
    /// <summary>
    ///     Represents a WebSocket-based message sent by the system.
    /// </summary>
    [DebuggerDisplay(@"{DebuggerDisplay,nq}")]
    public class SocketSystemMessage : SocketMessage, ISystemMessage
    {
        internal SocketSystemMessage(DiscordSocketClient discord, ulong id, ISocketMessageChannel channel, SocketUser author)
            : base(discord, id, channel, author, MessageSource.System)
        {
        }
        internal new static SocketSystemMessage Create(DiscordSocketClient discord, ClientState state, SocketUser author, ISocketMessageChannel channel, Model model)
        {
            var entity = new SocketSystemMessage(discord, model.Id, channel, author);
            entity.Update(state, model);
            return entity;
        }
        internal override void Update(ClientState state, Model model)
        {
            base.Update(state, model);
        }

        private string DebuggerDisplay => $"{Author}: {Content} ({Id}, {Type})";
        internal new SocketSystemMessage Clone() => MemberwiseClone() as SocketSystemMessage;
    }
}