EventDescriptorCollection.Item[] Property

Definition

Namespace:

System.ComponentModel

Assembly:

System.ComponentModel.TypeConverter.dll

Gets the specified event.

Overloads

Item[Int32]	Gets or sets the event with the specified index number.
Item[String]	Gets or sets the event with the specified name.

Item[Int32]

Source:

EventDescriptorCollection.cs

Gets or sets the event with the specified index number.

public:
 virtual property System::ComponentModel::EventDescriptor ^ default[int] { System::ComponentModel::EventDescriptor ^ get(int index); };

public virtual System.ComponentModel.EventDescriptor? this[int index] { get; }

member this.Item(int) : System.ComponentModel.EventDescriptor

Default Public Overridable ReadOnly Property Item(index As Integer) As EventDescriptor

Parameters

index

Int32

The zero-based index number of the EventDescriptor to get or set.

Property Value

EventDescriptor

The EventDescriptor with the specified index number.

Exceptions

IndexOutOfRangeException

index is not a valid index for Item[Int32].

Examples

The following code example uses the Item[] property to print the name of the EventDescriptor specified by the index number in a text box. Because the index number is zero-based, this example prints the name of the second EventDescriptor. It requires that button1 and textBox1 have been instantiated on a form.

private:
   void PrintIndexItem()
   {
      
      // Creates a new collection and assigns it the events for button1.
      EventDescriptorCollection^ events = TypeDescriptor::GetEvents( button1 );
      
      // Prints the second event's name.
      textBox1->Text = events[ 1 ]->ToString();
   }

private void PrintIndexItem() {
    // Creates a new collection and assigns it the events for button1.
    EventDescriptorCollection events = TypeDescriptor.GetEvents(button1);
 
    // Prints the second event's name.
    textBox1.Text = events[1].ToString();
 }

Private Sub PrintIndexItem()
    ' Creates a new collection and assigns it the events for button1.
    Dim events As EventDescriptorCollection = TypeDescriptor.GetEvents(button1)
    
    ' Prints the second event's name.
    textBox1.Text = events(1).ToString()
End Sub

Remarks

The index number is zero-based. Therefore, you must subtract 1 from the numerical position of a particular EventDescriptor to access that EventDescriptor. For example, to get the third EventDescriptor, you need to specify myColl[2].

See also

• EventDescriptor
• TypeDescriptor

Item[String]

Source:

EventDescriptorCollection.cs

Gets or sets the event with the specified name.

public:
 virtual property System::ComponentModel::EventDescriptor ^ default[System::String ^] { System::ComponentModel::EventDescriptor ^ get(System::String ^ name); };

public virtual System.ComponentModel.EventDescriptor this[string name] { get; }

member this.Item(string) : System.ComponentModel.EventDescriptor

Default Public Overridable ReadOnly Property Item(name As String) As EventDescriptor

Parameters

name

String

The name of the EventDescriptor to get or set.

Property Value

EventDescriptor

The EventDescriptor with the specified name, or null if the event does not exist.

Examples

The following code example uses the Item[] property to print the type of the component for the EventDescriptor specified by the index. It requires that button1 and textBox1 have been instantiated on a form.

private:
   void PrintIndexItem2()
   {
      
      // Creates a new collection and assigns it the events for button1.
      EventDescriptorCollection^ events = TypeDescriptor::GetEvents( button1 );
      
      // Sets an EventDescriptor to the specific event.
      EventDescriptor^ myEvent = events[ "KeyDown" ];
      
      // Prints the name of the event.
      textBox1->Text = myEvent->Name;
   }

private void PrintIndexItem2() {
    // Creates a new collection and assigns it the events for button1.
    EventDescriptorCollection events = TypeDescriptor.GetEvents(button1);
 
    // Sets an EventDescriptor to the specific event.
    EventDescriptor myEvent = events["KeyDown"];
 
    // Prints the name of the event.
    textBox1.Text = myEvent.Name;
 }

Private Sub PrintIndexItem2()
    ' Creates a new collection and assigns it the events for button1.
    Dim events As EventDescriptorCollection = TypeDescriptor.GetEvents(button1)
    
    ' Sets an EventDescriptor to the specific event.
    Dim myEvent As EventDescriptor = events("KeyDown")
    
    ' Prints the name of the event.
    textBox1.Text = myEvent.Name
End Sub

Remarks

The Item[] property is case-sensitive when searching for names. That is, the names "Ename" and "ename" are considered to be two different events.

Note

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.

See also

• EventDescriptor
• TypeDescriptor