c# - Inherit from internal SoundEffectInstance, no constructors defined -

i'm trying create new class fadablesoundeffectinstance, inherits soundeffectinstance.

my fadablesoundeffectinsance allow soundeffectinstances easlily faded in , out, after finishing class, rewarded lovely error here:

the type 'microsoft.xna.framework.audio.soundeffectinstance' has no constructors defined

after while of research , digging xna source, found this.

internal soundeffectinstance(soundeffect parenteffect, bool fireandforget) { ... } 

so have constructor, cannot access it.

how can work around able create class?

note people have not used xna before, not create new class blah = new soundeffectinstance instead load soundeffect , use method createinstance(). also, soundeffect sealed class. also, adding constructor new class throw same error, soundeffectinstance instead.

here relevant code incase need in depth

fadablesoundeffectinstance

    public sealed class fadablesoundeffectinstance : soundeffectinstance     {         public float fadespeed = .01f;         public audiofadestate fadestate = audiofadestate.normal;          public void fadeout()         {             //logic         }         public void fadein()         {             //logic         }         public void update(gametime gametime)         {             //logic         }     } 

and extension method can call soundeffect.createfadableinstance()

    public static fadablesoundeffectinstance createfadableinstance(this soundeffect soundeffect)     {         return (fadablesoundeffectinstance)soundeffect.createinstance();     } 

your question not unique.
don't have access constructor, can't create derived class. same whether use xna or not.

if want use new sound effect directly, can create pseudo-decorator, takes in actual soundeffectinstance , wraps it.

however, doesn't if want pass sound effect xna methods want soundeffectinstance.