C#•2y ago

❔ Static Field get not called!

Hey i try to make a Registry a static field call the Register Method but the static field get never called, if i would remove the static it would works but it should possible to get it anyway.

22 Replies

MrScautHD•2y ago

    // OBJECTS
    public static readonly StreetLightRenderer StreetLightRenderer = Register("street_light", new StreetLightRenderer());
    
    // OVERLAY
    public static readonly CrosshairOverlay CrosshairOverlay = Register("crosshair", new CrosshairOverlay());

    private static T Register<T>(string name, T renderer) {
        RegistryTypes.Renderers.Add(name, (IRenderer) renderer);

        return renderer;
    }

    // OBJECTS
    public static readonly StreetLightRenderer StreetLightRenderer = Register("street_light", new StreetLightRenderer());
    
    // OVERLAY
    public static readonly CrosshairOverlay CrosshairOverlay = Register("crosshair", new CrosshairOverlay());

    private static T Register<T>(string name, T renderer) {
        RegistryTypes.Renderers.Add(name, (IRenderer) renderer);

        return renderer;
    }

i hope anyone know why my static field get not called

canton7•2y ago

What do you mean by "field not get called"? Do you mean the Register method is never invoked?

MrScautHD•2y ago

yea but just if the field is static

canton7•2y ago

A type's static constructor is called at any point between the assembly being loaded, and a member of the type being accessed for the first time (it's a little bit more complex, with beforefieldinit etc) But basically, Register will be called the first time that someone accesses a member on the type, or at any unspecified point before

MrScautHD•2y ago

hää but static works normaly like class get created this field get created too or not? so to fix that i need to remove the static thing or call it? is there no other way? like static and get created instand

canton7•2y ago

I'm afraid I'm having a hard time working out what you're saying "get created instand"?

MrScautHD•2y ago

like if it not static it get created if a class get created

canton7•2y ago

Right, and static fields are created the first time that someone accesses a member on the type. E.g. do var x = WhateverType.CrosshairOverlay, and the static constructor will definitely be run

MrScautHD•2y ago

mhh ok and is there nothing else like static like you can acces with the class (no new object) but it get created when a class get created (like in java)

canton7•2y ago

Like what in java?

MrScautHD•2y ago

in java get the field called when the program start what ever i see its not possible with c#

canton7•2y ago

The JLS doesn't think so. It seems to have the same behaviour as C#: https://docs.oracle.com/javase/specs/jls/se8/html/jls-12.html#jls-12.4.1

A class or interface type T will be initialized immediately before the first occurrence of any one of the following: - T is a class and an instance of T is created. - A static method declared by T is invoked. - A static field declared by T is assigned. - A static field declared by T is used and the field is not a constant variable (§4.12.4). - T is a top level class (§7.6) and an assert statement (§14.10) lexically nested within T (§8.1.3) is executed.

cap5lut•2y ago

thats wrong, even in java only if the class will be initialized (which might not be at program start) it executes that.

cap5lut•2y ago

u could force it to load with a module initializer method: https://learn.microsoft.com/en-us/dotnet/api/system.runtime.compilerservices.moduleinitializerattribute?view=net-7.0

ModuleInitializerAttribute Class (System.Runtime.CompilerServices)

Used to indicate to the compiler that a method should be called in its containing module's initializer.

MrScautHD•2y ago

Yes but thats already better too I mean i could but its not really clesn

canton7•2y ago

I mean, this design isn't really clean. It relies on a static constructor having side-effects which are visible outside of that type

cap5lut•2y ago

well, yeah, one (small) thing would be adding a constraint to T for private static T Register<T>(string name, T renderer) instead of blindly casting

MrScautHD•2y ago

Yea Well

arion•2y ago

System.Runtime.CompilerServicesRuntimeHelpers.RunClassConstructor(typeof(YourClass).TypeHandle); is also an option, you can couple that with reflection of the assembly.GetTypes() if you'd want (It runs the static constructor as well as initializing all static readonly fields I don't advise this reflection approach for SingleFile builds though if you know that this wont mess up your code, you can do

foreach (Type t in Assembly.GetExecutingAssembly().GetTypes()) 
    RuntimeHelpers.RunClassConstructor(t.TypeHandle);

foreach (Type t in Assembly.GetExecutingAssembly().GetTypes()) 
    RuntimeHelpers.RunClassConstructor(t.TypeHandle);

MrScautHD•2y ago

nahh i just stay then by the not static one ? ohh i understand

     private static T Register<T>(string name, T renderer) where T : IRenderer {
          RegistryTypes.Renderers.Add(name, renderer);
        
          return renderer;
     }

     private static T Register<T>(string name, T renderer) where T : IRenderer {
          RegistryTypes.Renderers.Add(name, renderer);
        
          return renderer;
     }

you mean that

cap5lut•2y ago

yep

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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❔ Static Field get not called!