viknsagit/telegram.bot.attributecommands

Library for creating commands for a telegram bot through attributes using Telegram.Bots

Telegram.Bot.AttributeCommands Library Documentation

The Telegram.Bot.AttributeCommands library offers a streamlined approach to managing and executing text, callback, and reply commands for a Telegram bot. By utilizing custom attributes to mark and categorize methods, this library simplifies the registration and processing of commands.

Table of Contents

• Introduction
• Getting Started
  • Creating Command Classes
  • Registering Commands
  • Handling Updates
• Usage
  • Attributes
    • TextCommandAttribute
    • CallbackCommandAttribute
    • ReplyCommandAttribute
  • Exceptions
    • CommandNotFoundException
    • CommandExistsException
    • CommandArgumentsCountError
    • CommandBadArgumentType
• Example
• Processing Updates
• Exception Handling

Introduction

The Telegram.Bot.AttributeCommands library provides an elegant solution for managing and processing different command types within a Telegram bot. By using custom attributes, the library organizes text, callback, and reply commands, leading to a more organized and efficient command handling process.

Getting Started

Creating Command Classes

To start using the Telegram.Bot.AttributeCommands library, create a class to contain your command methods. These methods should be static and marked with the appropriate command attributes.

Registering Commands

Before utilizing the registered commands, instantiate the AttributeCommands class. Use the RegisterCommands method to register commands from your command class. This method combines the registration of text, callback, and reply commands.

Here's an example of registering commands:

using Telegram.Bot;
using Telegram.Bot.Types;

public class YourBotClass
{
    private readonly TelegramBotClient _botClient;
    private readonly AttributeCommands _commands;

    public YourBotClass(string botToken)
    {
        _botClient = new TelegramBotClient(botToken);
        _commands = new AttributeCommands();

        // Register your command classes
        _commands.RegisterCommands(typeof(TestCommands));
    }

    // Other bot handling methods here...
}

Handling Updates

When handling incoming updates in your bot's code, ensure that you invoke the appropriate command processing methods based on the command type received. This guarantees that registered methods with corresponding attributes are invoked correctly.

private async Task HandleUpdateAsync(ITelegramBotClient botClient, Update update, CancellationToken cancellationToken)
{
    switch (update)
    {
        case { Message: { } message }:
            {
                if (message.ReplyToMessage != null)
                    await BotOnReplyMessage(message, cts);
                else if (message.Text != null)
                    await BotOnMessageReceived(message, cts);
            }

            break;

        case { CallbackQuery: { } callbackQuery }:
            await BotOnCallbackQueryReceived(callbackQuery, cts);
            break;

        default:
            await UnknownUpdateHandlerAsync(update, cts);
            break;
    }
}

private async Task BotOnCallbackQueryReceived(CallbackQuery callbackQuery, CancellationTokenSource cts)
{
    try
    {
        await _commands.ProcessCommand(callbackQuery.Data!, new object[] { botClient, callbackQuery });
    }
    catch (CommandNotFoundException ex)
    {
        await botClient.SendTextMessageAsync(callbackQuery.Message!.Chat.Id, ex.Message);
    }
}

private async Task BotOnMessageReceived(Message message, CancellationTokenSource cts)
{
    try
    {
        await _commands.ProcessCommand(message.Text!, new object[] { botClient, message });
    }
    catch (CommandNotFoundException ex)
    {
        await botClient.SendTextMessageAsync(message.Chat.Id, ex.Message);
    }
}

private async Task BotOnReplyMessage(Message message, CancellationTokenSource cts)
{
    try
    {
        await _commands.ProcessCommand(message.ReplyToMessage!.Text!, new object[] { botClient, message });
    }
    catch (CommandNotFoundException ex)
    {
        await botClient.SendTextMessageAsync(message.Chat.Id, ex.Message);
    }
}

Usage

Attributes

The Telegram.Bot.AttributeCommands library includes three custom attributes to mark methods as different command types.

TextCommandAttribute

Use the TextCommandAttribute to identify methods as text commands for your Telegram bot.

[TextCommand("your_text_command")]
public static void YourTextCommandMethod(TelegramBotClient client, Update update)
{
    // Your text command logic here
}

CallbackCommandAttribute

Employ the CallbackCommandAttribute to mark methods as callback commands.

[CallbackCommand("your_callback_command")]
public static void YourCallbackCommandMethod(TelegramBotClient client, Update update)
{
    // Your callback command logic here
}

ReplyCommandAttribute

Utilize the ReplyCommandAttribute to indicate methods as reply commands.

[ReplyCommand("your_reply_command")]
public static void YourReplyCommandMethod(TelegramBotClient client, Update update)
{
    // Your reply command logic here
}

Exceptions

The Telegram.Bot.AttributeCommands library provides custom exceptions for error handling.

CommandNotFoundException

Thrown when attempting to process a non-existent command.

CommandExistsException

Thrown when trying to register a command with a duplicate name.

CommandArgumentsCountError

Thrown when the number of arguments provided does not match the expected count.

CommandBadArgumentType

Thrown when the type of an argument provided does not match the expected type.

Example

using Telegram.Bot;
using Telegram.Bot.Types;

public class TestCommands
{
    [TextCommand("start")]
    public static void StartCommand(TelegramBotClient client, Update update)
    {
        // Logic for the start text command
    }

    [CallbackCommand("button_click")]
    public static void ButtonClickCallback(TelegramBotClient client, Update update)
    {
        // Logic for the button click callback command
    }

    [ReplyCommand("thanks")]
    public static void ThankYouReply(TelegramBotClient client, Update update)
    {
        // Logic for the thank you reply command
    }
}

Processing Updates

When handling incoming updates in your bot's code, make sure to invoke the appropriate ProcessCommand method based on the command type received. This ensures that registered methods with corresponding attributes are invoked correctly.

Exception Handling

When using the Telegram.Bot.AttributeCommands library, handle exceptions to provide a smooth user experience. Catch CommandNotFoundException, CommandExistsException, CommandArgumentsCountError, and CommandBadArgumentType exceptions as needed.

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This comprehensive documentation covers the Telegram.Bot.AttributeCommands library, including its custom attributes and exceptions. For more detailed information and usage scenarios, refer to the library's source code and comments.

Please note that this documentation is provided for informational purposes.