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POStatic constructor on a .NET interface is not run
 

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    <p>You can define a static constructor on an interface in .NET in IL. However, if you do so, the static constructor is not run when you run a method on the interface:</p> <pre><code>.method public static void Main() { .entrypoint .locals init ( class IInterface cls1 ) // InterfaceClass static constructor is run newobj instance void InterfaceClass::.ctor() stloc.0 ldloc.0 // IInterface static constructor is not run!!!!! callvirt instance int32 IInterface::Method() call void [mscorlib]System.Console::WriteLine(int32) ret } .class public interface IInterface { .method private static specialname rtspecialname void .cctor() { ldstr "Interface static cctor" call void [mscorlib]System.Console::WriteLine(string) ret } .method public abstract virtual instance int32 Method() {} } .class public InterfaceClass implements IInterface { .method private static specialname rtspecialname void .cctor() { ldstr "Class static cctor" call void [mscorlib]System.Console::WriteLine(string) ret } .method public specialname rtspecialname instance void .ctor() { ldarg.0 call instance void [mscorlib]System.Object::.ctor() ret } .method public virtual instance int32 Method() { ldc.i4.s 42 ret } } </code></pre> <p>What's going on here? The CLR spec (Partition II, 10.5.3.1) says that when type initializers are executed is specified in Partition I, but I cannot find any reference in Partition I to type initializer execution.</p> <p>EDIT:</p> <p>I <em>can</em> get the interface static intitializer to run, but only by adding a static field to the interface, and accessing that field somewhere in the code, even if the field isn't actually assigned in the static constructor. So it seems that calling a method on an interface does not make the static constructor run, but accessing a field does. Why is this the case? And where is this mentioned in the spec?</p>
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    1. COYou are directly writing IL rather than compiling C#/VB etc? If so then why don't you compare your IL to that which the C# compiler emits?
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      1. USDavid Heffernan
    2. COYou can't define a static constructor on an interface in C#. You can only do it in IL. I'm defining it in exactly the same way as on the class, and that is running as expected.
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    3. CO@David: The C# compiler won't let you implement a static constructor on an interface.
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      1. USGrant Thomas
 

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