Interface declarations

What is translated > Types > Records, Classes, Interfaces > Interfaces > Interface declarations

Delphi interfaces define a contract via the interface keyword, and often include a GUID to support COM identity and interface querying (e.g., Supports). The translated C# code uses the standard interface construct, optionally extended by a base interface (IInterface) to simulate Delphi-style type casting and compatibility features.

Delphi Example

type

  IMyInterface = interface

    ['{12345678-1234-1234-1234-1234567890AB}']

    procedure DoSomething;

  end;

In Delphi, the interface declares a method DoSomething. The GUID enables runtime interface querying and is part of Delphi's COM compatibility. Interfaces implicitly descend from IUnknown unless specified otherwise.

C# Translation

public interface IFoo : IInterface

{

   void DoSomething();

}; 

IInterface is a placeholder base interface defined by Delphi2C# to simulate Delphi-style interface hierarchies.

It does not include methods like AddRef or QueryInterface.

The GUID can be declared using [Guid("...")], but is not required in standard .NET usage.

Base Interface: IInterface

public interface IInterface

{

// Dummy - no methods necessary for .NET, but necessary for type casting

}

- In .NET, interfaces do not require a base unless semantic compatibility with Delphi is needed.

- IInterface serves as a type anchor for functions like Supports<T>(), which mimic Delphi's interface querying behavior.

- In COM-compatible builds, IInterface may be replaced or extended with a true IUnknown contract.

Notes

- Multiple interface inheritance is supported in both Delphi and C#.

- Interface members in Delphi map directly to method declarations in C#.

This page belongs to the Delphi2C# Documentation