ComVisiblefalse

ComVisiblefalse is a term that appears in some programming contexts, particularly within Microsoft's .NET Framework and COM Interoperability. It is not a standard keyword or a commonly recognized programming construct in itself. Instead, it typically refers to a configuration or a property setting that dictates whether a .NET component is exposed for use by COM (Component Object Model) clients.

When a .NET assembly is designed to be accessible from older COM-based applications, certain attributes need to be applied. Conversely, if a .NET component is not intended for COM interop, it might be configured with a setting that effectively translates to "ComVisible=false." This prevents COM clients from discovering or interacting with the types and members defined within that .NET component.

The purpose of setting ComVisible to false is primarily for security and performance. By hiding .NET types from COM, you reduce the attack surface and prevent unintended exposure of internal implementation details. It also ensures that only intended .NET components are marshaled across the COM boundary, potentially improving performance by avoiding unnecessary overhead. This setting is often controlled through the AssemblyInfo.cs (or AssemblyInfo.vb) file in a .NET project, where an attribute like [assembly: ComVisible(false)] can be applied.