Purge command

purge.cs

using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using DSharpPlus;
using DSharpPlus.CommandsNext;
using DSharpPlus.CommandsNext.Attributes;
using DSharpPlus.Entities;

namespace SharkBot.Commands
{
    class PurgeCommands : BaseCommandModule
    {
        [Command("purge")]
        [Description("Purges a given channel's messages with a filter")]
        [RequirePermissions(Permissions.ManageMessages)]
        public async Task Purge(
            CommandContext ctx,
            [Description("How many messages to purge")]
            int messageCount,
            [Description("**Match string**")] string filter = null,
            [Description("***Optional***")] [RemainingText]
            string args = null)
        {
            filter = filter?.ToLower();
            List<DiscordMessage> messagesToPurge = null;
            await ctx.Message.DeleteAsync();

            if (messageCount <= 100)
            {
                IReadOnlyList<DiscordMessage> allMessages;
                if (filter == null)
                {
                    allMessages = await ctx.Channel.GetMessagesAsync(messageCount);
                    messagesToPurge = allMessages.Reverse().Take(messageCount).ToList();
                    await ctx.Channel.DeleteMessagesAsync(messagesToPurge, null);
                }
                else if (filter == "match" && args != null)
                {
                    allMessages = await ctx.Channel.GetMessagesAsync(messageCount);
                    messagesToPurge = allMessages.Where(x => x.Content.Contains(args)).ToList();
                    await ctx.Channel.DeleteMessagesAsync(messagesToPurge, null);
                }
                else
                {
                    await ctx.Channel.SendMessageAsync("You fucked up, try the command again");
                }

                if (messagesToPurge != null)
                {
                    await ctx.Channel.SendMessageAsync($"Deleted : {messagesToPurge.Count()} messages");
                }

                var logChannel = ctx.Guild.Channels.Values.FirstOrDefault(x => x.Name.ToLower() == "training");
                if (logChannel != null && messagesToPurge != null)
                {
                    await logChannel.SendMessageAsync(
                        $"{ctx.Message.Author.Username} purged {messagesToPurge.Count()} messages from {ctx.Message.Channel.Name}");
                }
            }
            else
            {
                await ctx.Channel.SendMessageAsync("Woah there, I can only delete 100 messages. Try again please.",
                    false, null, null);
            }
        }
    }
}