EventInfo.EventHandlerType 屬性

定義

命名空間:

System.Reflection

組件:

System.Runtime.dll

來源:

EventInfo.cs

取得與這個事件相關之目前的事件處理常式委派之 Type 物件。

public:
 virtual property Type ^ EventHandlerType { Type ^ get(); };

public virtual Type? EventHandlerType { get; }

member this.EventHandlerType : Type

Public Overridable ReadOnly Property EventHandlerType As Type

屬性值

Type

表示委派事件處理常式的唯讀 Type 物件。

例外狀況

SecurityException

呼叫端沒有必要的權限。

範例

下列範例會 EventHandlerType 使用 屬性來探索事件的委派類型，並顯示其參數類型。

此範例會定義名為 MyDelegate 的委派，以及名為 類型的MyDelegate事件ev。 方法中的 Main 程式代碼會藉由取得事件的委派類型、取得 Invoke 委派類型的方法，然後擷取和顯示參數，來探索事件簽章。

// 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

另請參閱

• Type
• Delegate
• EventHandler