EventInfo.EventHandlerType 属性

定义

命名空间:

System.Reflection

程序集:

System.Reflection.dll

程序集:

System.Runtime.dll

程序集:

mscorlib.dll

程序集:

netstandard.dll

获取与此事件关联的基础事件处理程序委托的 Type 对象。

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

属性值

Type

表示委托事件处理程序的只读 Type 对象。

实现

EventHandlerType

例外

SecurityException

调用方没有所要求的权限。

示例

以下示例使用 EventHandlerType 该属性来发现事件的委托类型并显示其参数类型。

该示例定义一个命名 MyDelegate 委托和一个名为 ev 类型的 MyDelegate事件。 方法中的 Main 代码通过获取事件的委托类型、获取 Invoke 委托类型的方法，然后检索和显示参数来发现事件签名。

// 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

另请参阅

• Type
• Delegate
• EventHandler