Application Commands events

Sometimes we need to add a variety of actions and checks before and after executing a command. We can do this in the commands itself, or we can use special events for this.

Before execution

The simplest example in this case: checking if the command was executed within the guild. Suppose we have a certain class with commands that must be executed ONLY in the guilds:

public class MyGuildCommands : ApplicationCommandsModule
{
    [SlashCommand("mute", "Mute user.")]
    public static async Task Mute(InteractionContext context)
    {

    }
    [SlashCommand("kick", "Kick user.")]
    public static async Task Kick(InteractionContext context)
    {

    }
    [SlashCommand("ban", "Ban user.")]
    public static async Task Ban(InteractionContext context)
    {

    }
}

In this case, the easiest way would be to override the method from ApplicationCommandsModule.

public class MyGuildCommands : ApplicationCommandsModule
{
    public override async Task<bool> BeforeSlashExecutionAsync(InteractionContext ctx)
    {
        if (ctx.Guild == null)
            return false;
    }

    [SlashCommand("mute", "Mute user.")]
    public static async Task Mute(InteractionContext context)
    {

    }
    [SlashCommand("kick", "Kick user.")]
    public static async Task Kick(InteractionContext context)
    {

    }
    [SlashCommand("ban", "Ban user.")]
    public static async Task Ban(InteractionContext context)
    {

    }
}

Now, before executing any of these commands, the BeforeSlashExecutionAsync method will be executed. You can do anything in it, for example, special logging. If you return true, then the command method will be executed after that, otherwise the execution will end there.

After execution

If you want to create actions after executing the command, then you need to do the same, but override a different method:

public override async Task AfterSlashExecutionAsync(InteractionContext ctx)
{
    // some actions
}

Context menus

You can also add similar actions for the context menus. But this time, you need to override the other methods:

public class MyGuildCommands : ApplicationCommandsModule
{
    public override async Task<bool> BeforeContextMenuExecutionAsync(ContextMenuContext ctx)
    {
        if (ctx.Guild == null)
            return false;
    }
    public override async Task AfterContextMenuExecutionAsync(ContextMenuContext ctx)
    {
        // some actions
    }
}