CollectionChangeEventArgs Class
Provides data for the CollectionChanged event.
Namespace: System.ComponentModel
Assembly: System (in System.dll)
The CollectionChangeEventArgs type exposes the following members.
| Name | Description | |
|---|---|---|
 | CollectionChangeEventArgs | Initializes a new instance of the CollectionChangeEventArgs class. |
| Name | Description | |
|---|---|---|
| Equals(Object) | Determines whether the specified object is equal to the current object. (Inherited from Object.) |
| Finalize | Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.) |
| GetHashCode | Serves as a hash function for a particular type. (Inherited from Object.) |
| GetType | Gets the Type of the current instance. (Inherited from Object.) |
| MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) |
| ToString | Returns a string that represents the current object. (Inherited from Object.) |
A CollectionChanged event is raised when you change which items are in a collection, for example, by adding an element to a collection or removing an element from the collection. This event is not raised when an individual element changes its value.
| Note |
|---|
The HostProtectionAttribute attribute applied to this type or member has the following Resources property value: SharedState. 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 demonstrates the use of this type. In the example, an event handler reports on the occurrence of the AutoCompleteStringCollection.CollectionChanged event. This report helps you to learn when the event occurs and can assist you in debugging. To report on multiple events or on events that occur frequently, consider replacing MessageBox.Show with Console.WriteLine or appending the message to a multiline TextBox.
To run the example code, paste it into a project that contains an instance of type AutoCompleteStringCollection named AutoCompleteStringCollection1. Then ensure that the event handler is associated with the AutoCompleteStringCollection.CollectionChanged event.
private void AutoCompleteStringCollection1_CollectionChanged(Object sender, CollectionChangeEventArgs e) { System.Text.StringBuilder messageBoxCS = new System.Text.StringBuilder(); messageBoxCS.AppendFormat("{0} = {1}", "Action", e.Action ); messageBoxCS.AppendLine(); messageBoxCS.AppendFormat("{0} = {1}", "Element", e.Element ); messageBoxCS.AppendLine(); MessageBox.Show(messageBoxCS.ToString(), "CollectionChanged Event" ); }
Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
