CollectionChangeEventArgs Class
Definition
Important
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Provides data for the CollectionChanged event.
public ref class CollectionChangeEventArgs : EventArgspublic class CollectionChangeEventArgs : EventArgstype CollectionChangeEventArgs = class
inherit EventArgsPublic Class CollectionChangeEventArgs
Inherits EventArgs- Inheritance
Examples
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" );
}
Private Sub AutoCompleteStringCollection1_CollectionChanged(sender as Object, e as CollectionChangeEventArgs) _
Handles AutoCompleteStringCollection1.CollectionChanged
Dim messageBoxVB as New System.Text.StringBuilder()
messageBoxVB.AppendFormat("{0} = {1}", "Action", e.Action)
messageBoxVB.AppendLine()
messageBoxVB.AppendFormat("{0} = {1}", "Element", e.Element)
messageBoxVB.AppendLine()
MessageBox.Show(messageBoxVB.ToString(),"CollectionChanged Event")
End Sub
Remarks
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.
Constructors
| CollectionChangeEventArgs(CollectionChangeAction, Object) |
Initializes a new instance of the CollectionChangeEventArgs class. |
Properties
| Action |
Gets an action that specifies how the collection changed. |
| Element |
Gets the instance of the collection with the change. |
Methods
| Equals(Object) |
Determines whether the specified object is equal to the current object. (Inherited from Object) |
| GetHashCode() |
Serves as the default hash function. (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) |
