CurrencyManager.ItemChanged Evento

Definición

Se produce cuando se ha modificado el elemento actual.Occurs when the current item has been altered.

public:
 event System::Windows::Forms::ItemChangedEventHandler ^ ItemChanged;
public event System.Windows.Forms.ItemChangedEventHandler ItemChanged;
member this.ItemChanged : System.Windows.Forms.ItemChangedEventHandler 
Public Custom Event ItemChanged As ItemChangedEventHandler 

Ejemplos

En el ejemplo de código siguiente se agregan controladores ItemChanged de PositionChanged eventos para los eventos y.The following code example adds event handlers for the ItemChanged and PositionChanged events.

void BindControl( DataTable^ myTable )
{
   
   // Bind A TextBox control to a DataTable column in a DataSet.
   textBox1->DataBindings->Add( "Text", myTable, "CompanyName" );
   
   // Specify the CurrencyManager for the DataTable.
   myCurrencyManager = dynamic_cast<CurrencyManager^>(this->BindingContext[myTable, ""]);
   
   // Add event handlers.
   myCurrencyManager->ItemChanged += gcnew ItemChangedEventHandler( this, &Form1::CurrencyManager_ItemChanged );
   myCurrencyManager->PositionChanged += gcnew EventHandler( this, &Form1::CurrencyManager_PositionChanged );
   
   // Set the initial Position of the control.
   myCurrencyManager->Position = 0;
}

void CurrencyManager_PositionChanged( Object^ sender, System::EventArgs^ /*e*/ )
{
   CurrencyManager^ myCurrencyManager = dynamic_cast<CurrencyManager^>(sender);
   Console::WriteLine( "Position Changed {0}", myCurrencyManager->Position );
}

void CurrencyManager_ItemChanged( Object^ sender, System::Windows::Forms::ItemChangedEventArgs^ /*e*/ )
{
   CurrencyManager^ myCurrencyManager = dynamic_cast<CurrencyManager^>(sender);
   Console::WriteLine( "Item Changed {0}", myCurrencyManager->Position );
}

   private void BindControl(DataTable myTable)
   {
       // Bind A TextBox control to a DataTable column in a DataSet.
       textBox1.DataBindings.Add("Text", myTable, "CompanyName");
       // Specify the CurrencyManager for the DataTable.
       myCurrencyManager = (CurrencyManager)this.BindingContext[myTable, ""];
       // Add event handlers.
       myCurrencyManager.ItemChanged+=
       new ItemChangedEventHandler(CurrencyManager_ItemChanged);
       myCurrencyManager.PositionChanged+= 
       new EventHandler(CurrencyManager_PositionChanged);
       // Set the initial Position of the control.
       myCurrencyManager.Position = 0;
   }

   private void CurrencyManager_PositionChanged(object sender, System.EventArgs e){
       CurrencyManager myCurrencyManager = (CurrencyManager) sender;
       Console.WriteLine("Position Changed " + myCurrencyManager.Position);
   }

   private void CurrencyManager_ItemChanged(object sender, System.Windows.Forms.ItemChangedEventArgs e){
       CurrencyManager myCurrencyManager = (CurrencyManager) sender;
       Console.WriteLine("Item Changed " + myCurrencyManager.Position);
   }
Private Sub BindControl(myTable As DataTable)
    ' Bind A TextBox control to a DataTable column in a DataSet.
    textBox1.DataBindings.Add("Text", myTable, "CompanyName")
    ' Specify the CurrencyManager for the DataTable.
    myCurrencyManager = CType(Me.BindingContext(myTable, ""), CurrencyManager)
    ' Add event handlers.
    AddHandler myCurrencyManager.ItemChanged, AddressOf CurrencyManager_ItemChanged
    AddHandler myCurrencyManager.PositionChanged, AddressOf CurrencyManager_PositionChanged
    ' Set the initial Position of the control.
    myCurrencyManager.Position = 0
End Sub


Private Sub CurrencyManager_PositionChanged(sender As Object, e As System.EventArgs)
    Dim myCurrencyManager As CurrencyManager = CType(sender, CurrencyManager)
    Console.WriteLine(("Position Changed " & myCurrencyManager.Position))
End Sub


Private Sub CurrencyManager_ItemChanged(sender As Object, e As System.Windows.Forms.ItemChangedEventArgs)
    Dim myCurrencyManager As CurrencyManager = CType(sender, CurrencyManager)
    Console.WriteLine(("Item Changed " & myCurrencyManager.Position))
End Sub

Comentarios

El ItemChanged evento se producirá cuando el usuario llame ResumeBinding al SuspendBinding método o.The ItemChanged event will occur when the user calls the ResumeBinding or SuspendBinding method.

El ItemChanged evento solo se produce cuando se ha cambiado el propio elemento de alguna manera.The ItemChanged event occurs only when the item itself has been changed in some manner. Por ejemplo, si se cambia el valor de un elemento de 10 a 42, se producirá el evento.For example, if the value of an item is changed from 10 to 42, the event will occur. No debe confundirse con el PositionChanged evento en el que el elemento se ha cambiado a un nuevo elemento.This should not be confused with the PositionChanged event where the item has been changed to a new item.

El evento también se producirá si cambian los datos subyacentes.The event will also occur if the underlying data changes. Por ejemplo, si cambia el valor de DataRowView, se producirá el ItemChanged evento.For example, if you change the value of a DataRowView, the ItemChanged event will occur.

Nota

Si va a crear su propio control que utiliza CurrencyManager, debe IBindingList.ListChanged utilizar en lugar del CurrencyManager.ItemChanged evento.If you are creating your own control that uses the CurrencyManager, you should use the IBindingList.ListChanged instead of the CurrencyManager.ItemChanged event. La ListChangedType propiedadListChangedEventArgs de permite determinar el tipo de acción que se ha producido.The ListChangedType property of the ListChangedEventArgs enables you to determine the type of action that has occurred.

Para obtener más información sobre el manejo de eventos, consulte controlar y provocar eventos.For more information about handling events, see Handling and Raising Events.

Se aplica a

Consulte también: