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    <p>It <em>seems</em> to me that even though you can define a .cctor on an interface in CLI, it is kind of useless. Partition I, § 8.9.5 states:</p> <blockquote> <p>If marked BeforeFieldInit then the type‘s initializer method is executed at, or sometime before, first access to any static field defined for that type. If not marked BeforeFieldInit then that type‘s initializer method is executed at (i.e., is triggered by): first access to any static field of that type, or first invocation of any static method of that type, or first invocation of any instance or virtual method of that type if it is a value type or first invocation of any constructor for that type. <strong>Execution of any type's initializer method will not trigger automatic execution of any initializer methods defined by its base type, nor of any interfaces that the type implements</strong></p> </blockquote> <p>(emphasis mine) Which means the type initializer on an interface does not get called automatically at all. If you want it to be called, you (IMHO) need to call it explicitly in all implementing classes, like this:</p> <pre><code>.method private static specialname rtspecialname void .cctor() { ldtoken IInterface callvirt instance valuetype [mscorlib]System.RuntimeTypeHandle [mscorlib]System.Type::get_TypeHandle() call void [mscorlib]System.Runtime.CompilerServices.RuntimeHelpers::RunClassConstructor(valuetype [mscorlib]System.RuntimeTypeHandle) ldstr "Class static cctor" call void [mscorlib]System.Console::WriteLine(string) ret } </code></pre>
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    1. COBut I am accessing a method defined on the interface directly (`callvirt instance int32 IInterface::Method()`), and I am not specifying `beforefieldinit`. This should make the static constructor run, no?
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    2. COAh, spotted your link in the comment above. However, that seems to be a C++-specifc thing. Although it does apply to the CLR, I can't find where in the CLR docs this behaviour is specified.
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    3. COI'm surprised it even mentions it. But that nails it.
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