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EventDescriptorCollection Class

Represents a collection of EventDescriptor objects.

Namespace:  System.ComponentModel
Assembly:  System (in System.dll)

[HostProtectionAttribute(SecurityAction.LinkDemand, Synchronization = true)]
public class EventDescriptorCollection : IList, 
	ICollection, IEnumerable


The HostProtectionAttribute attribute applied to this type or member has the following Resources property value: Synchronization. The HostProtectionAttribute does not affect desktop applications (which are typically started by double-clicking an icon, typing a command, or entering a URL in a browser). For more information, see the HostProtectionAttribute class or SQL Server Programming and Host Protection Attributes.

EventDescriptorCollection is read-only; it does not implement methods that add or remove events. You must inherit from this class to implement these methods.

Using the properties available in the EventDescriptorCollection class, you can query the collection about its contents. Use the Count property to determine the number of elements in the collection. Use the Item property to get a specific property by index number or by name.

You can also use the Find method to get a description of the event with the specified name from the collection.

The following code example prints all the events on a button in a text box. It requires that button1 and textBox1 have been instantiated on a form.

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';


Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0

XNA Framework

Supported in: 3.0, 2.0, 1.0