C#•3y ago

Access Modifiers in C-Sharp [Answered]

Which access modifier take precedence during runtime? The access modifier at the class level, the method level or the field level? Do the access modifier at the class level override all the access modifier for it's members? Is there a precedence being taken place? etc... etc....

14 Replies

Bobby BobOP•3y ago

What does u mean by "restrictive" what's considered a class member that is restrictive? Oh nvm, I think I get what u mean How does this work in a non-static context? for example

internal  class Utilities {
    public void Method() { ... }
}

internal  class Utilities {
    public void Method() { ... }
}

How can a program outside of an assembly invoke Method() if Utilities can't be instantiated outside of it's assembly? oooooooooh

Aaron•3y ago

public and internal would mean the same thing there they are just both allowed

Bobby BobOP•3y ago

Ok, so the "public" access modifier in method is useless? Does that imply that method will never be invoked outside of it's assembly even though the public keyword exists because it's access modifier is less restrictive than it's class access modifier? Ah I see I see So if I don't specify any access modifier for a class's member, will all the class's member "inherit" from class access modifier or will it just default back to internal regardless of what access modifier the class has? So they'll just default to internal? ???? I don't understand, so class members will just default to private? Wait wtf, there's different default access modifier depending for types and members? That's quite complex.... I thought all types and members have a default access modifier of "internal" regardless of if they are nested or not Yeah but I'm saying what would the default be if we don not explicitly specify a access modifier? If we just omit the access modifier in this method for example Like so

internal class Utilities {
    void Method() { ... }
}

internal class Utilities {
    void Method() { ... }
}

will the method have a internal access modifier or will it just default to private access modifier? This contradicts with other info I get, because I've been told that all access modifiers are, by default, internal Ah ok, I think I'm starting to get it now Does access modifier have an impact on performance? For example, will a public class run slower than a private class? Does it affect performance at all? I'll just set it to the most restrictive as reasonable, the more restrictive the more I can protect the integrity of my code integrity as in prevent unintentional misuse of code Using the code the way that it was not intended, restricting how my code can be used such that it fits within the context that I want it to be specifically used Yeah I just saw a video about sealed in Nick Chapsas Apparently sealed gives a huge performance boost, holy shit one of his benchmarks for sealed classes was 1000x faster than the non-sealed class and it also promotes code integrity as well, so that's a bonus 😄

mtreit•3y ago

Can you link to that? Because the performance boost for sealing classes is very small

Bobby BobOP•3y ago

https://youtu.be/d76WWAD99Yo

Nick Chapsas

YouTube

Why all your classes should be sealed by default in C#

Check out my courses: https://nickchapsas.com Become a Patreon and get source code access: https://www.patreon.com/nickchapsas Hello everybody I'm Nick and in this video I will explain why you should be sealing all your C# classes by default. We will take a look at the functional aspect of the sealing feature and then take a look at the perform...

Bobby BobOP•3y ago

At some point in the video he had a benchmark with 1000x increase, I can't remember where but it was pretty damn impressive Yeah, I heard at some point in the video he was using .NET RC 2 as well Which like u said, shouldn't be possible, not sure why he said that Maybe he has some exclusive early access before each RC comes out?

Aaron•3y ago

it does reproduce

|     Method |      Mean |     Error |    StdDev | Code Size |
|----------- |----------:|----------:|----------:|----------:|
|   OpenVoid | 0.4774 ns | 0.0054 ns | 0.0045 ns |      20 B |
| SealedVoid | 0.0226 ns | 0.0050 ns | 0.0041 ns |       7 B |
|    OpenInt | 0.9832 ns | 0.0163 ns | 0.0136 ns |      25 B |
|  SealedInt | 0.0173 ns | 0.0053 ns | 0.0049 ns |      12 B |

|     Method |      Mean |     Error |    StdDev | Code Size |
|----------- |----------:|----------:|----------:|----------:|
|   OpenVoid | 0.4774 ns | 0.0054 ns | 0.0045 ns |      20 B |
| SealedVoid | 0.0226 ns | 0.0050 ns | 0.0041 ns |       7 B |
|    OpenInt | 0.9832 ns | 0.0163 ns | 0.0136 ns |      25 B |
|  SealedInt | 0.0173 ns | 0.0053 ns | 0.0049 ns |      12 B |

also got some disassembly (it doesnt reproduce to the thousands range though...) yeah he says rc2 i think ¯\_(ツ)_/¯ it's possible its a local build ah the sealed versions get inlined

Aaron•3y ago

Aaron•3y ago

cc, since you were wondering what was up here

mtreit•3y ago

I didn't watch the video yet...I am mainly interested in seeing the 1000x result.

Aaron•3y ago

i did the same benchmark its just calling a single method the "1000x" is 8ns to .008 ns likely not a real 1000x

mtreit•3y ago

.008 ns is getting into the realm where we can't reliably actually measure that granularity with accuracy, at least to my understanding

Aaron•3y ago

that is what i mean

Accord•3y ago

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Access Modifiers in C-Sharp [Answered]

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