How Can I Create a COM Interop Component from a Simple C# DLL for Use in VB6?

Turning a Simple C# DLL into a COM Interop Component for VB6

Introduction:
Integrating C# libraries with VB6 applications requires a COM interop layer to bridge the communication gap. This article provides a comprehensive guide on transforming a basic C# DLL into a COM interop component that can be seamlessly consumed by VB6 applications.

Creating the C# DLL:

1. Establish a C# solution with a class project.
2. Define an interface for the class properties/methods and another interface for events.
3. Assign GUID attributes to the class and interfaces as outlined in MSDN.
4. Enable COM visibility by checking "Make assembly COM-Visible" in Project Properties.
5. Set "Platform target" to x86 in Project Properties.

Registering the DLL:

• Option 1: Auto-Registering: Check "Register for COM Interop" in Project Properties.

• Option 2: Manual Registration with RegAsm:

  • Copy the DLL to the desired directory.
  • Open a command prompt with administrator privileges and enter the following command:

  RegAsm.exe -tlb -codebase mydll.dll

Installing the DLL with InstallShield:

1. Add a component to InstallShield and associate it with a Feature.
2. Set ".NET COM Interop" to Yes for the component.
3. Add the .dll file, disable Self-Registration, and set it as the Key File.
4. Add the .tlb file, enable Self-Registration, and ensure the correct .Net Framework version on the target PC.

Incorporation into VB6:

Once the COM interop DLL is registered, you can add a reference to it in VB6. Intellisense and functionality will be available as with any other COM DLL.

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