Discord.Net/src/Discord.Net.Commands/CommandContext.cs

namespace Discord.Commands
{
    public class CommandContext : ICommandContext
    {
        public IDiscordClient Client { get; }
        public IGuild Guild { get; }
        public IMessageChannel Channel { get; }
        public IUser User { get; }
        public IUserMessage Message { get; }

        public bool IsPrivate => Channel is IPrivateChannel;
        
        public CommandContext(IDiscordClient client, IUserMessage msg)
        {
            Client = client;
            Guild = (msg.Channel as IGuildChannel)?.Guild;
            Channel = msg.Channel;
            User = msg.Author;
            Message = msg;
        }
    }
}