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EventDescriptorCollection.Count Property

Gets the number of event descriptors in the collection.

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

public int Count { get; }

Property Value

Type: System.Int32
The number of event descriptors in the collection.

The Count property can be used to set the limits of a loop that iterates through a collection of objects. If the collection is zero-based, be sure to use Count - 1 as the upper boundary of the loop.


The HostProtectionAttribute attribute applied to this class 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.

The following code example uses the Count property to print the number of events attached to button1. It requires that button1 and textBox1 have been instantiated on a form.

private void GetCount() {
    // Creates a new collection and assigns it the events for button1.
    EventDescriptorCollection events = TypeDescriptor.GetEvents(button1);

    // Prints the number of events on button1 in a text box.
    textBox1.Text = events.Count.ToString();

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