Exportar (0) Imprimir
Expandir todo

ControlBindingsCollection (Clase)

Representa la colección de enlaces de datos de un control.

Espacio de nombres: System.Windows.Forms
Ensamblado: System.Windows.Forms (en system.windows.forms.dll)

[TypeConverterAttribute("System.Windows.Forms.Design.ControlBindingsConverter, System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")] 
public class ControlBindingsCollection : BindingsCollection
/** @attribute TypeConverterAttribute("System.Windows.Forms.Design.ControlBindingsConverter, System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a") */ 
public class ControlBindingsCollection extends BindingsCollection
TypeConverterAttribute("System.Windows.Forms.Design.ControlBindingsConverter, System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a") 
public class ControlBindingsCollection extends BindingsCollection
No aplicable.

Un enlace de datos simple se consigue agregando objetos Binding a ControlBindingsCollection. Cualquier objeto que hereda de la clase Control puede tener acceso a ControlBindingsCollection mediante la propiedad DataBindings. Para obtener una lista de los controles de Windows que admiten enlaces de datos, vea la clase Binding.

ControlBindingsCollection contiene métodos de colección estándar, como Add, Clear y Remove.

Para obtener el control al que pertenece ControlBindingsCollection use la propiedad Control.

En el siguiente ejemplo de código se agregan objetos Binding a una ControlBindingsCollection de cinco controles: cuatro controles TextBox y un control DateTimePicker. Se obtiene acceso a ControlBindingsCollection mediante la propiedad DataBindings de la clase Control.

protected void BindControls()
{
   /* Create two Binding objects for the first two TextBox 
   controls. The data-bound property for both controls 
   is the Text property. The data source is a DataSet 
   (ds). The data member is the navigation path: 
   TableName.ColumnName. */
   textBox1.DataBindings.Add(new Binding
   ("Text", ds, "customers.custName"));
   textBox2.DataBindings.Add(new Binding
   ("Text", ds, "customers.custID"));
      
   /* Bind the DateTimePicker control by adding a new Binding. 
   The data member of the DateTimePicker is a navigation path:
   TableName.RelationName.ColumnName. */
   DateTimePicker1.DataBindings.Add(new 
   Binding("Value", ds, "customers.CustToOrders.OrderDate"));

   /* Create a new Binding using the DataSet and a 
   navigation path(TableName.RelationName.ColumnName).
   Add event delegates for the Parse and Format events to 
   the Binding object, and add the object to the third 
   TextBox control's BindingsCollection. The delegates 
   must be added before adding the Binding to the 
   collection; otherwise, no formatting occurs until 
   the Current object of the BindingManagerBase for 
   the data source changes. */
   Binding b = new Binding
   ("Text", ds, "customers.custToOrders.OrderAmount");
   b.Parse+=new ConvertEventHandler(CurrencyStringToDecimal);
   b.Format+=new ConvertEventHandler(DecimalToCurrencyString);
   textBox3.DataBindings.Add(b);

   /*Bind the fourth TextBox to the Value of the 
   DateTimePicker control. This demonstates how one control
   can be data-bound to another.*/
   textBox4.DataBindings.Add("Text", DateTimePicker1,"Value");

   // Get the BindingManagerBase for the textBox4 Binding.
   BindingManagerBase bmText = this.BindingContext
   [DateTimePicker1];

   /* Print the Type of the BindingManagerBase, which is 
   a PropertyManager because the data source
   returns only a single property value. */
   Console.WriteLine(bmText.GetType().ToString());

   // Print the count of managed objects, which is one.
   Console.WriteLine(bmText.Count);

   // Get the BindingManagerBase for the Customers table. 
   bmCustomers = this.BindingContext [ds, "Customers"];

   /* Print the Type and count of the BindingManagerBase.
   Because the data source inherits from IBindingList,
   it is a RelatedCurrencyManager (a derived class of
   CurrencyManager). */
   Console.WriteLine(bmCustomers.GetType().ToString());
   Console.WriteLine(bmCustomers.Count);
   
   /* Get the BindingManagerBase for the Orders of the current
   customer using a navigation path: TableName.RelationName. */ 
   bmOrders = this.BindingContext[ds, "customers.CustToOrders"];
}

System.Object
   System.MarshalByRefObject
     System.Windows.Forms.BaseCollection
       System.Windows.Forms.BindingsCollection
        System.Windows.Forms.ControlBindingsCollection

Los miembros estáticos públicos (Shared en Visual Basic) de este tipo son seguros para la ejecución de subprocesos. No se garantiza que los miembros de instancias sean seguros para la ejecución de subprocesos.

Windows 98, Windows 2000 Service Pack 4, Windows CE, Windows Millennium, Windows Mobile para Pocket PC, Windows Mobile para Smartphone, Windows Server 2003, Windows XP Media Center, Windows XP Professional x64, Windows XP SP2, Windows XP Starter

Microsoft .NET Framework 3.0 es compatible con Windows Vista, Microsoft Windows XP SP2 y Windows Server 2003 SP1.

.NET Framework

Compatible con: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Compatible con: 2.0, 1.0
Mostrar:
© 2015 Microsoft