C#•2y ago

what is this operation?

thieved · 2023-02-18T02:46:22.160Z

```cs discord.MessageCreated += async (s, e) => ``` context:

discord.MessageCreated += async (s, e) =>

discord.MessageCreated += async (s, e) =>

context:

14 Replies

thieved•2y ago

im learning C# i know what += but why is it used like this in C#?

mtreit•2y ago

That's an event You are adding an event handler to the event

mtreit•2y ago

https://learn.microsoft.com/en-us/dotnet/csharp/programming-guide/events/

Events - C# Programming Guide

Learn about events. Events enable a class or object to notify other classes or objects when something of interest occurs.

thieved•2y ago

i know what an event is but i meant why is += being used for that? i come from javascript and lua so += is for adding to strings, numbers, etc. elaborate is this one of those things like 'it is what it is' ?

mtreit•2y ago

Yes, that syntax goes back to C# 1.0 over 20 years ago They wanted events to be a first class thing and to support registering multiple event handlers for a single event

thieved•2y ago

oh okay well thats refreshing i thought id have to discover some indepth explanation because i like to know the why to things but one question what does an event look like for that to be the operation to subscribe to it? right like just calling .on() multiple times right ohhh so thats a whole type i made an event emitter in lua so thats odd to have a whole type for events what is a delegate? im new to C# lol

        public event AsyncEventHandler<DiscordClient, ReadyEventArgs> Ready
        {
            add => this._ready.Register(value);
            remove => this._ready.Unregister(value);
        }

        public event AsyncEventHandler<DiscordClient, ReadyEventArgs> Ready
        {
            add => this._ready.Register(value);
            remove => this._ready.Unregister(value);
        }

so add is called when an event is added? i sorta understand wait i do

rotor_•2y ago

So C# delegates are composable? Do they feed the output of one into the input of the next or do they all just get run with the outputs discarded?

thieved•2y ago

new DiscordConfiguration() {
    Token = Environment.GetEnvironmentVariable("DISCORDTOKEN"),
    TokenType = TokenType.Bot
}

new DiscordConfiguration() {
    Token = Environment.GetEnvironmentVariable("DISCORDTOKEN"),
    TokenType = TokenType.Bot
}

sorry to ask another question but how does this work ? why isnt the object passed inside the class parameters ?

rotor_•2y ago

It's a limitation of the library - honestly that should be passed in the constructor But like moles says there's a workaround

thieved•2y ago

couldnt they pass an object? lol

rotor_•2y ago

This is true, but I'd argue that the DiscordConfiguration won't do much without a token Oooo I didn't know that thank you!

thieved•2y ago

omg C# and the extension for it on VSCODE has such good reference tracking

thieved•2y ago

thieved•2y ago

anyways, thank you sm @implicit electron ❤️

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Programming

what is this operation?