最可能的原因是p4dn.dll不是托管程序集，因此您试图以此方式加载它.您可能需要改为通过DLLImport语句访问文件.

The most likely reason is the p4dn.dll is not a managed assembly, and you are trying to load it as such. You probably need to access the file via DLLImport statements instead.