Purpose of C# constructor extern modifier

.net, c#

Solution

I believe one use/purpose of an extern ctor is to have the constructor implemented within the CLR itself. if you disassemble mscorlib.dll using Reflector and look at the System.String type, you'll see:

[MethodImpl(MethodImplOptions.InternalCall)]
public extern String(char[] value);

Which basically tells us that the (char[]) ctor for the string class is externally implemented, as part of the .net runtime.

Problem

What is the Purpose of C# constructor extern modifier? I know about usage of extern METHODS to invoke Win32 functions, but what about CONSTRUCTORS? Please give the practical example. Note this: ``` class MyClass { public extern MyClass(); } ```

Original source