CLR Supported Custom Attributes

After working with the CLR for more than a decade, once in a while I still run into surprising behavior.

It turns out that the (non pseudo-) custom attributes that CLR recognizes are only matched by name, not assembly.

So you can do this for example:

using System;

using System.Threading;

namespace System {

  class ThreadStaticAttribute : global::System.Attribute { }

}

class Program {

  [System.ThreadStaticAttribute]

  static int foo;

  public static void Main() {

    WriteFoo();

    foo = 42;

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