EventDescriptorCollection 类

定义

public ref class EventDescriptorCollection : System::Collections::IList

public class EventDescriptorCollection : System.Collections.IList

[System.Runtime.InteropServices.ComVisible(true)]
public class EventDescriptorCollection : System.Collections.IList

type EventDescriptorCollection = class
    interface ICollection
    interface IEnumerable
    interface IList

[<System.Runtime.InteropServices.ComVisible(true)>]
type EventDescriptorCollection = class
    interface IList
    interface ICollection
    interface IEnumerable

[<System.Runtime.InteropServices.ComVisible(true)>]
type EventDescriptorCollection = class
    interface ICollection
    interface IEnumerable
    interface IList

Public Class EventDescriptorCollection
Implements IList

继承

Object

EventDescriptorCollection

属性

ComVisibleAttribute

实现

ICollection IEnumerable IList

示例

下面的代码示例在文本框中打印按钮上的所有事件。 它要求 button1 和 textBox1 已在窗体上实例化。

private:
   void MyEventCollection()
   {
      // Creates a new collection and assigns it the events for button1.
      EventDescriptorCollection^ events = TypeDescriptor::GetEvents( button1 );
      
      // Displays each event in the collection in a text box.
      for each ( EventDescriptor^ myEvent in events )
      {
         textBox1->Text = String::Concat( textBox1->Text, myEvent->Name, "\n" );
      }
   }

private void MyEventCollection() {
    // Creates a new collection and assigns it the events for button1.
    EventDescriptorCollection events = TypeDescriptor.GetEvents(button1);
 
    // Displays each event in the collection in a text box.
    foreach (EventDescriptor myEvent in events)
       textBox1.Text += myEvent.Name + '\n';
 }

Private Sub MyEventCollection()
    ' Creates a new collection and assigns it the events for button1.
    Dim events As EventDescriptorCollection = TypeDescriptor.GetEvents(button1)
    
    ' Displays each event in the collection in a text box.
    Dim myEvent As EventDescriptor
    For Each myEvent In  events
        textBox1.Text &= myEvent.Name & ControlChars.Cr
    Next myEvent
End Sub

注解

EventDescriptorCollection 为只读;它不实现添加或删除事件的方法。 必须从此类继承才能实现这些方法。

使用 类中 EventDescriptorCollection 可用的属性，可以查询集合中的内容。 使用 Count 属性可确定集合中的元素数。 Item[]使用 属性可按索引号或名称获取特定属性。

还可以使用 Find 方法从集合中获取具有指定名称的事件的说明。

构造函数

字段

属性

方法

显式接口实现

扩展方法

适用于

另请参阅

• EventDescriptor
• TypeDescriptor