How to Create a COM Interop DLL from a C# DLL for VB6?

Creating a COM Interop DLL from a C# DLL

Question: How can I transform a C# DLL into a COM interop DLL usable by a VB6 application?

Answer:

Creating a COM interop DLL in C# involves the following steps:

Generating the C# DLL:

1. Initialize a C# class project with interfaces for properties/methods and events.
2. Assign GUID attributes to the class and interfaces as per Microsoft's guidelines.
3. Enable COM visibility by checking "Make assembly COM-Visible" in Project Properties.
4. Set the "Platform target" to x86 in Project Properties > Build.

Registering the DLL:

On the Development Machine:

• Option 1: Enable "Register for COM Interop" in Project Properties > Build and build the project.

• Option 2: Use RegAsm to manually register the DLL:

  • Navigate to the desired directory.
  • Open a command prompt with administrator privileges and run:
    RegAsm.exe -tlb -codebase mydll.dll
    Replace "mydll.dll" with the actual DLL name.

Installing with InstallShield:

1. Create a component in InstallShield and associate it with a feature.
2. Enable ".NET COM Interop" for the component.
3. Add the DLL file to the component's Files section without self-registering.
4. Add the TLB file, enabling self-registration.
5. Ensure the target PC has the compatible .Net Framework version installed.

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