.NET equivalent of Java's Integer.bitCount?

Question

Is there a method similar to Java's Integer.bitCount(int) or Long.bitCount(long) anywhere in the .NET Framework?

(For those unfamiliar with these Java methods) this is also known as:

• Hamming Weight
• Population Count (often called POPCNT when implemented in hardware.)

Although there are plenty of implementations to be found on the web, I was wondering if there was a standard library implementation.

I know this is not in BitArray, UInt32 or BitConverter, but maybe there's a version hidden somewhere, e.g. in a crypto function.