C# how can I access an element in nested array

Question

ReplyKeyboardMarkup replyKeyboardMarkup = new(new[]
                {
                 new KeyboardButton[]{ "January", "February", "March", "April"},
                 new KeyboardButton[]{ "May", "June", "July", "August"},
                 new KeyboardButton[]{ "September", "October", "November", "December"},
                })

I have the following code, where ReplyKeyboardMarkup is a custom class from telegram.Bot api from nuget packages. How can I access a specified element, like first string in first KeyboardButton array (January)?

I expacted it to be smth like: universalLayout.Keyboard[i][j] = "smth new"; Or universalLayout[i][j] = "smth new"; — Palamar66
– Palamar66, Commented Sep 26, 2022 at 11:07
@Palamar66: And what happens when you try that? What even is universalLayout? — David
– David, Commented Sep 26, 2022 at 11:09
Once you feed your collection to the ReplyKeyboardMarkup constructor, you are constrained to however that exposes the data. As this is not a class that's part of the standard library you'd have to at least specify what library you're using (a link to the NuGet package would be nice). — Jeroen Mostert
– Jeroen Mostert, Commented Sep 26, 2022 at 11:09
core.telegram.org/constructor/replyKeyboardMarkup just guessing — Jodrell
– Jodrell, Commented Sep 26, 2022 at 11:09

Tim Schmelter · Accepted Answer · 2022-09-26 11:21:44Z

1

You are looking for the Keyboard property:

string january = replyKeyboardMarkup.Keyboard
        .FirstOrDefault()?.FirstOrDefault()?.Text;

The Text property comes from the KeyboardButton and is what you have specified.

You have commented that you want to access it as a real array, because you want to modify each button easily. Then you can use this approach:

KeyboardButton[][] kbButtonArray = replyKeyboardMarkup.Keyboard as KeyboardButton[][]
            ?? replyKeyboardMarkup.Keyboard.Select(x => x.ToArray()).ToArray();

Actually the try-cast already works in the current implementation, so no need for the LINQ query. But since it it's an IEnumerable<IEnumerable<KeyboardButton>> that cast might fail in future.

edited Sep 26, 2022 at 11:21

answered Sep 26, 2022 at 11:09

Tim Schmelter

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5 Comments

Palamar66 Over a year ago

Thx for answer, I should have specified, that I want to access the value in order to change it inside the Markup.

Tim Schmelter Over a year ago

@Palamar66: What value you want to access? Instead of ...?.Text you can also select the button itself. Then you can modify it. KeyboardButton firstButton = replyKeyboardMarkup.Keyboard.FirstOrDefault()?.FirstOrDefault();

Palamar66 Over a year ago

I want to get any value by passing it's index, like the first button row, third button smth like replyKeyboardMarkup[0][2]

Palamar66 Over a year ago

Yeah, that wasn't that obvious. Thanks for answer, I'll accept it in a minute.

Andro Over a year ago

then just call replyKeyboardMarkup[0][2] to get 2nd element of {"January", "February", "March"}, in you case this will be "March"

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