BindingContext Propriété
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Propriété Control.BindingContext

 

Obtient ou définit le BindingContext du contrôle.

Espace de noms:   System.Windows.Forms
Assembly:  System.Windows.Forms (dans System.Windows.Forms.dll)

[BrowsableAttribute(false)]
public virtual BindingContext BindingContext { get; set; }

Valeur de propriété

Type: System.Windows.Forms.BindingContext

BindingContext du contrôle.

The BindingContext of a Control is used to return a single BindingManagerBase for all data-bound controls contained by the Control.The BindingManagerBase keeps all controls that are bound to the same data source synchronized.For example, setting the Position property of the BindingManagerBase specifies the item in the underlying list that all data-bound controls point to.

For more information about creating a new BindingContext and assigning it to the BindingContext property, see the BindingContext.

Remarques à l'attention des héritiers :

When overriding the BindingContext property in a derived class, use the base class's BindingContext property to extend the base implementation.Otherwise, you must provide all the implementation.You are not required to override both the get and set accessors of the BindingContext property; you can override only one if needed.

The following code example creates four Binding objects to bind five controls, a DateTimePicker and four TextBox controls, to several data sources.The BindingContext is then used to get the BindingManagerBase for each data source.

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 a navigation path in the form: 
      "TableName.ColumnName". */
   text1.DataBindings.Add(new Binding
   ("Text", ds, "customers.custName"));
   text2.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 string. */
   DateTimePicker1.DataBindings.Add(new 
   Binding("Value", ds, "customers.CustToOrders.OrderDate"));

   /* Add event delegates for the Parse and Format events to a 
      new 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);
   text3.DataBindings.Add(b);

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

   /* Get the BindingManagerBase for the Orders table using the 
      RelationName. */ 
   bmOrders = this.BindingContext[ds, "customers.CustToOrders"];

   /* Bind the fourth TextBox control's Text property to the
   third control's Text property. */
   text4.DataBindings.Add("Text", text3, "Text");
}

.NET Framework
Disponible depuis 1.1
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