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vb.net dll reflection event


vb.net dll reflection event

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vb.net dll reflection event
Tag : .net , By : kokok13
Date : November 28 2020, 11:01 PM

it helps some times I've reached a solution with help of this answer. I feel like this is the best solution at the moment and it produces usable errors if it fails.
The code in the dll and the binding of the method stay unchanged, but the called method now uses reflection to get the Value property. Ported to VB.net the method looks like this:
  Public Sub ShowValue(ByVal sender As Object, ByVal e As EventArgs)
    Dim ValueProperty As PropertyInfo = e.GetType().GetProperty("Value")
    Dim Value As Integer = Convert.ToInt32(ValueProperty.GetValue(e, Nothing))

    MessageBox.Show(Value.ToString())
  End Sub

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How to attach event handler to an event using reflection?


Tag : chash , By : anov
Date : March 29 2020, 07:55 AM
this one helps. I think your code is failing because the HandleRfqSendComment is private. Instead you could directly create a delegate to that method, without passing its name to CreateDelegate. You would then need to convert the delegate to the required type, using the following method :
public static Delegate ConvertDelegate(Delegate originalDelegate, Type targetDelegateType)
{
    return Delegate.CreateDelegate(
        targetDelegateType,
        originalDelegate.Target,
        originalDelegate.Method);
}
EventInfo eventInfo = rfqWindowManager.GetType().GetEvent("SendComment");
Action<object, object> handler = HandleRfqSendComment;
Delegate convertedHandler = ConvertDelegate(handler, eventInfo.EventHandlerType);
eventInfo.AddEventHandler(rfqWindowManager, convertedHandler);

How to do reflection without System.Reflection? i.e. build custom reflection classes?


Tag : .net , By : Guy Kastenbaum
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , You can simply take a look at the source of Mono.Cecil.

Binding an event handler to any type of event using reflection


Tag : chash , By : user119605
Date : March 29 2020, 07:55 AM
I wish did fix the issue. I have some code where I need to dynamically bind events to an event handler: , Here is one way to do it:
First create this helper class:
public class HandlerHelper<T> where T : EventArgs
{
    private readonly EventHandler m_HandlerToCall;

    public HandlerHelper(EventHandler handler_to_call)
    {
        m_HandlerToCall = handler_to_call;
    }

    public void Handle(object sender, T args)
    {
        m_HandlerToCall.Invoke(sender, args);
    }
}
var event_handler = new EventHandler((s, args) =>
{
    // More awesomeness here...
});
foreach (var event_name in event_names)
{
    var event_info = control.GetType().GetEvent(event_name);

    var event_handler_type = event_info.EventHandlerType;

    var event_args_type = event_handler_type.GetMethod("Invoke").GetParameters()[1].ParameterType;

    var helper_type = typeof(HandlerHelper<>).MakeGenericType(event_args_type);

    var helper = Activator.CreateInstance(helper_type, event_handler);

    Delegate my_delegate = Delegate.CreateDelegate(event_handler_type, helper, "Handle");

    event_info.AddEventHandler(button, my_delegate);
}
void Handle(object sender, MouseEventArgs args)

Why can't I get the event handler of a LinkButton's event using reflection?


Tag : chash , By : Bruce
Date : March 29 2020, 07:55 AM
seems to work fine Looking at the LinkCommand reference source:
public event CommandEventHandler Command is "magic".

C# Reflection Programmatic Event Handlers with Custom Event Args


Tag : chash , By : Cesar Sanz
Date : March 29 2020, 07:55 AM
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