将VB.NET转换为C＃接口

Question

I need help in converting a VB.NET interface to one in C#. The code below defines an Event and raises it in a method.

Public Event CampaignDetailSelected(ByVal listItem As ListItem) _
Implements ICampaignMaintenanceView.CampaignDetailSelected

...

RaiseEvent CampaignDetailSelected(DirectCast(lsbCampaignDetail.SelectedItem, ListItem))

The interface for it is:

Public Interface ICampaignMaintenanceView
    Event CampaignDetailSelected(listItem As ListItem)
    ...
End Interface

When I push the interface above through a converter, it converts the Event but also includes a delegate, which is not allowed in C#.

Can anyone give me a hint?

Answer 1

It is one of the many issues I've had with C# versus VB.NET, as much as I love C#, VB.NET makes events simpler.

// Placed outside of the class
public delegate void CampaignDetailSelectedEventHandler(ListItem listItem);

// Test class to show to convert from vb.net to C# 
public class Test : ICampaignMaintenanceView
{
    public event CampaignDetailSelectedEventHandler CampaignDetailSelected; 


    protected virtual void OnCampaignDetailSelected(ListItem listItem)
    {
        if (CampaignDetailSelected != null)
        {
            CampaignDetailSelected(listItem);
        }
    }
}

Answer 2

Your C# delegate and interface should look like:

public delegate void CampaignDetailSelectedEventHandler(ListItem listItem);

public interface ICampaignMaintenanceView
{
    event CampaignDetailSelectedEventHandler CampaignDetailSelected;
}