EventInfo.EventHandlerType 屬性

定義

命名空間:

System.Reflection

組件:

System.Reflection.dll

組件:

System.Runtime.dll

組件:

mscorlib.dll

組件:

netstandard.dll

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:
 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

屬性值

Type

表示委派事件處理常式的唯讀 Type 物件。

實作

EventHandlerType

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