EventInfo.EventHandlerType Proprietà

Definizione

Ottiene l'oggetto Type del delegato del gestore eventi sottostante associato a questo evento.Gets the Type object of the underlying event-handler delegate associated with this event.

public:
 virtual property Type ^ EventHandlerType { Type ^ get(); };
public:
 property Type ^ EventHandlerType { Type ^ get(); };
public virtual Type EventHandlerType { get; }
public virtual Type? EventHandlerType { get; }
public Type EventHandlerType { get; }
member this.EventHandlerType : Type
Public Overridable ReadOnly Property EventHandlerType As Type
Public ReadOnly Property EventHandlerType As Type

Valore della proprietà

Type

Oggetto Type di sola lettura che rappresenta il gestore eventi del delegato.A read-only Type object representing the delegate event handler.

Implementazioni

Eccezioni

Il chiamante non dispone dell'autorizzazione richiesta.The caller does not have the required permission.

Esempio

Nell'esempio seguente viene utilizzata la EventHandlerType proprietà per individuare il tipo delegato di un evento e per visualizzarne i tipi di parametro.The following example uses the EventHandlerType property to discover the delegate type of an event and to display its parameter types.

Nell'esempio viene definito un delegato denominato MyDelegate e un evento denominato ev di tipo MyDelegate .The example defines a delegate named MyDelegate and an event named ev of type MyDelegate. Il codice nel Main metodo individua la firma dell'evento ottenendo il tipo delegato dell'evento, ottenendo il Invoke metodo del tipo delegato e quindi recuperando e visualizzando i parametri.The code in the Main method discovers the event signature by getting the delegate type of the event, getting the Invoke method of the delegate type, and then retrieving and displaying the parameters.

// The following example uses instances of classes in
// the System::Reflection namespace to discover an event argument type.
using namespace System;
using namespace System::Reflection;

public delegate void MyDelegate( int i );
public ref class MainClass
{
public:
   event MyDelegate^ ev;
};

int main()
{
   Type^ delegateType = MainClass::typeid->GetEvent( "ev" )->EventHandlerType;
   MethodInfo^ invoke = delegateType->GetMethod( "Invoke" );
   array<ParameterInfo^>^pars = invoke->GetParameters();
   System::Collections::IEnumerator^ myEnum = pars->GetEnumerator();
   while ( myEnum->MoveNext() )
   {
      ParameterInfo^ p = safe_cast<ParameterInfo^>(myEnum->Current);
      Console::WriteLine( p->ParameterType );
   }
}
// The example displays the following output:
//       System.Int32
// The following example uses instances of classes in
// the System.Reflection namespace to discover an event argument type.
using System;
using System.Reflection;

public delegate void MyDelegate(int i);
public class MainClass
{
    public event MyDelegate ev;

    public static void Main()
    {
        Type delegateType = typeof(MainClass).GetEvent("ev").EventHandlerType;
        MethodInfo invoke = delegateType.GetMethod("Invoke");
        ParameterInfo[] pars = invoke.GetParameters();
        foreach (ParameterInfo p in pars)
        {
            Console.WriteLine(p.ParameterType);
        }
    }
}
// The example displays the following output:
//       System.Int32
Imports System.Reflection

Public Delegate Sub MyDelegate(ByVal i As Integer)

Public Class MainClass
    Public Event ev As MyDelegate

    Public Shared Sub Main()
        Dim delegateType As Type = GetType(MainClass).GetEvent("ev").EventHandlerType
        Dim invoke As MethodInfo = delegateType.GetMethod("Invoke")
        Dim pars As ParameterInfo() = invoke.GetParameters()
        For Each p As ParameterInfo In pars
            Console.WriteLine(p.ParameterType)
        Next 
    End Sub 
End Class 
' The example displays the following output:
'     System.Int32

Si applica a

Vedi anche