C#•2y ago

❔ Copying video on Delegates, why doesn't my version work?

Why does my code not work, but the code in the video i'm following does. OhNo

26 Replies

Angius•2y ago

Idk, what's the error?

DeanOP•2y ago

Angius•2y ago

Well, the difference, then, is that Start() in the video is not static, while your Main() is You can make your Testdelegatefunction field static Same for the TestBullshitDelegate method

DeanOP•2y ago

hmm so why did main being static stop it working? i thought that just means you cant instantiate a new object of it is there another way around it without making the field and method static?

DeanOP•2y ago

DeanOP•2y ago

ok that also fixes it thanks for the help

Angius•2y ago

There is a way, creating your own, separate non-static main Gimme a second

public class App
{
    public void Run(string[] args)
    {
        // your actual code goes here
    }
}

public class App
{
    public void Run(string[] args)
    {
        // your actual code goes here
    }
}

public class Program
{
    public static void Main(string[] args)
        => new App().Run(args);
}

public class Program
{
    public static void Main(string[] args)
        => new App().Run(args);
}

And you only work with the App class, not touching Program and Main()

DeanOP•2y ago

=> new App().Run(args); what's this syntax called lambda expression? these seem to have different rules in different scenarios dont have them all memories properly

Angius•2y ago

Expression-bodied method

DeanOP•2y ago

it doesnt require something on the left of it?

Angius•2y ago

The signature of the method is to the left

DeanOP•2y ago

thats usually the arguments on the left right?

Angius•2y ago

    public static void Main(string[] args)
        => new App().Run(args);

    public static void Main(string[] args)
        => new App().Run(args);

is the same as

    public static void Main(string[] args)
    {
        new App().Run(args);
    }

    public static void Main(string[] args)
    {
        new App().Run(args);
    }

It's not an anonymous function/lambda Just a shorthand for writing one-liner methods

MODiX•2y ago

Angius#1586

REPL Result: Success

int Sum(int a, int b) => a + b;

Sum(6, 4)

int Sum(int a, int b) => a + b;

Sum(6, 4)

Result: int

Compile: 432.017ms | Execution: 36.994ms | React with ❌ to remove this embed.

DeanOP•2y ago

i wish they would pick something different than => when its a different thing

Angius•2y ago

Yeah, that's a valid concern

DeanOP•2y ago

so its saying execute/return the following but it only works if its 1 line?

Angius•2y ago

Yep

DeanOP•2y ago

alright cool gotta smash that into my brain

Angius•2y ago

Or, well, one statement

int Whatever() => things
    .Select(x => x.Count)
    .Where(x => x > 18)
    .Aggregate((a, b) => a + b, 0);

int Whatever() => things
    .Select(x => x.Count)
    .Where(x => x > 18)
    .Aggregate((a, b) => a + b, 0);

for example is multiple lines, but it's a single statement

DeanOP•2y ago

right, it's everything chainged up in one statement ended by one ; how are you getting the comments to format your code? int Whaetver() => 1 is there a page somewhere that shows you i cant see it

Angius•2y ago

$code

MODiX•2y ago

To post C# code type the following: ```cs // code here ``` Get an example by typing $codegif in chat If your code is too long, post it to: https://paste.mod.gg/

DeanOP•2y ago

$codegif

MODiX•2y ago

https://cdn.discordapp.com/attachments/364492811489509376/892176158312001586/code.gif

Accord•2y ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ Copying video on Delegates, why doesn't my version work?