OK, I found the solution by my self with hints from codeproject.com and stackoverflow.com. The main thing is the interface of type dispatch and the connection of it to the class.
Here is the code:
using System;
using System.Text;
using System.Runtime.InteropServices;
namespace SceSapGui
{
public delegate void SceEventHandler(object text, EventArgs e); // Definition of the event handler body (parameters)
// Interface 1 (Dispatch)
[InterfaceTypeAttribute(ComInterfaceType.InterfaceIsIDispatch)] // This interface is for the event handler (dispatch)
[GuidAttribute("00000000-0000-0000-0000-000000000001")] // Anyone needs a different guid
[ComVisible(true)] // Make it visible
public interface ISceSapGuiDispatch
{
[DispId(1)] // Define the eventid
void SceClicked(object text, EventArgs e); // Event definition
}
// Interface 2 (Methode and properties)
[GuidAttribute("00000000-0000-0000-0000-000000000002")] // Anyone needs a different guid
[InterfaceTypeAttribute(ComInterfaceType.InterfaceIsDual)] // This interface is for data in/out
[ComVisible(true)] // Make it visible
public interface ISceSapGui
{
void Init(string @URI); // definition of a methode
string R3ReturnCode { get; } // definition of a readonly property
}
[GuidAttribute("00000000-0000-0000-0000-000000000003")] // Anyone needs a different guid
[ClassInterface(ClassInterfaceType.None)] // Prevent compiler to build automaticaly a default interface
[ComSourceInterfaces(typeof(ISceSapGuiDispatch))] // Attach the dispatch interface (don't know why in this way and not by inheritance like interface2)
[ComVisible(true)] // Make it visible
public partial class SceSapGui : ISceSapGui // Main class derived by interface 2
{
#region Interface member ISceSapGuiDispatch
public event SceEventHandler SceClicked; // Event handler variable
protected virtual void OnSceClicked(EventArgs e, string text) // Call this if you want to raise the event
{
if (this.SceClicked != null) // but make it only if someone attached to it
this.SceClicked((object)text, new EventArgs()); // Raise the event
}
#endregion
#region Interface member ISceSapGui
[ComVisible(true)]
public void Init(string @URI)
{
// ...
}
[ComVisible(true)]
public string R3ReturnCode
{
get { return "0"; }
}
#endregion
}
}
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