可悲的是，我认为这里的人没有任何办法想通了。我正在使用的两个DLL来自下载的ZIP文件，当我进入这些文件的属性时，会有一个框显示它们是从Internet下载的，因此我必须解除阻止它们。似乎64位应用程序池没有兑现这一要求，但是当我降至32位时，它做到了。一旦我解除阻止了DLL，一切就开始正常工作。

Sadly, I don't think there is any way someone here could have figured this out. Two DLLs I was using came from a downloaded ZIP file and when I went to the properties of those files there was a box that said they had been downloaded off the internet and I had to "unblock" them. Seems the 64-bit app pool did not honor this, but when I dropped to 32-bit it did. Once I "unblocked" the DLLs everything started working just fine.