仔细检查DLL - 错误基本上是这不是程序集，这意味着它是一个本机DLL。

你不能引用本机DLL ，只有.NET一个也有帮助的程序集如果文件带有DLL扩展名。

必须通过PInvoke访问本机文件。

Check the DLL carefully - the error is basically saying "this isn't an Assembly" which means it's a native DLL instead.
You can't reference a native DLL, only .NET an assemblies which are also helps if files with a DLL extension.
Native files have to be accessed via PInvoke instead.