Making A WebSocket Server With .NET 8🧑‍💻 [FULLSTACK 2024 VIDEO 1]

Source code: github.com/uldahlalex/ws/tree... (Link to exact source code by the end of the video)
Preliminary knowledge:
- Basic knowledge about Web and APIs
- Basic C# knowledge
- Basic CLI skills (shell commands like cd, mkdir, ls ...)
- For making the small client app: Basic Angular knowledge
TIMESTAMPS:
00:00: What are WebSockets?
02:08: .NET WebSocket Server
06:32: WebSocket Communication
09:42: Broadcasting Data
11:54: WebSocket Client App
17:48: Final product

[@oliverager7448]

Great new video keep up the good work

[@StackOverflowMan]

Why do you choose Flesk? Agree, API looks clearer than for System.Net.WebSockets, but maybe that abstraction level leaks?

[@guillermomazzari8320]

Nice vid, could I stablish a ws connection to my database and update the Ui in real time when something changes in the database? for example, If I call data form a table of people, where I have john, Mary and Laura and I am seeing this list in my frontend ui, but someone else deletes Laura in another browser, will I see that change on my browser immediately? without having to refresh or make a new request to the data base?

[@alexdevden]

Hey, thank you!
There are DBMS's that support listening for database changes and can emit events for this use case. For instance, this repo: github.com/supabase/realtime uses Postgres and Websockets to achieve this effect.

[@guillermomazzari8320]

@@alexdevden I was looking into signalR what are your thoughts on it?

[@alexdevden]

SignalR doesn't use generic websockets since they try to "build on top of" websockets. That means you need a dedicated SignalR client. It's kind of the same deal with Socket.IO. I prefer to use open standards and protocols rather than technologies that lock you in to specific SDKs
@@guillermomazzari8320

[@guillermomazzari8320]

@@alexdevden Thanks for your answer! It is very helpful

[@CodingByAmp]

How to bordcast all client

[@alexdevden]

In short, if you have a List connections, you can iterate over this list and send to each like this:
foreach (var connection in connections)
{
var string = "hello world";
connection.Send(message);
}