AsInvoker

AsInvoker is a mechanism used in software development, particularly within the .NET Framework, to control the security context in which a method is executed. When a method is marked with the `[assembly: ComVisible(true)]` attribute, it implies that the assembly it resides in is intended to be callable from unmanaged code, such as COM. However, this doesn't inherently define the security context. The `AsInvoker` principal, also referred to as `new`, is the default identity for code that is not explicitly assigned a specific security identity. This means that code running under the `AsInvoker` security principal executes with the same permissions as the calling process.

This is a crucial concept for security. If an application runs with elevated privileges, any code executing under the `AsInvoker` principal within that application will also inherit those elevated privileges. Conversely, if the application runs with limited privileges, the `AsInvoker` code will also be restricted. This behavior is often desirable for simple scenarios where the calling process has already established the appropriate security level. It avoids the need for complex identity management when the security context is already implicitly defined by the host application. Understanding `AsInvoker` helps developers predict and manage the security implications of their code, especially when interacting with different security zones or when dealing with unmanaged code.