C＃项目设置“允许不安全的代码”的实际功能是什么

I was wondering if the C# project setting "Allow unsafe code" applies only to unsafe C# code in the project itself, or is it necessary to set this option when linking in a native C++ DLL? What about linking in a managed DLL that itself links to a native DLL? What does this option really do, under the hood?I was wondering if the C# project setting "Allo