ControlBindingsCollection Classe

Definição

public ref class ControlBindingsCollection : System::Windows::Forms::BindingsCollection

[System.ComponentModel.TypeConverter("System.Windows.Forms.Design.ControlBindingsConverter, System.Design, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")]
public class ControlBindingsCollection : System.Windows.Forms.BindingsCollection

[System.ComponentModel.TypeConverter("System.Windows.Forms.Design.ControlBindingsConverter, System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")]
public class ControlBindingsCollection : System.Windows.Forms.BindingsCollection

[System.ComponentModel.TypeConverter("System.Windows.Forms.Design.ControlBindingsConverter, System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")]
public class ControlBindingsCollection : System.Windows.Forms.BindingsCollection

[<System.ComponentModel.TypeConverter("System.Windows.Forms.Design.ControlBindingsConverter, System.Design, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")>]
type ControlBindingsCollection = class
    inherit BindingsCollection

[<System.ComponentModel.TypeConverter("System.Windows.Forms.Design.ControlBindingsConverter, System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")>]
type ControlBindingsCollection = class
    inherit BindingsCollection

[<System.ComponentModel.TypeConverter("System.Windows.Forms.Design.ControlBindingsConverter, System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")>]
type ControlBindingsCollection = class
    inherit BindingsCollection

Public Class ControlBindingsCollection
Inherits BindingsCollection

Herança

Object

MarshalByRefObject

BaseCollection

BindingsCollection

ControlBindingsCollection

Atributos

TypeConverterAttribute

Exemplos

O seguinte exemplo de código adiciona Binding objetos a um ControlBindingsCollection de cinco controlos: quatro TextBox controlos e um DateTimePicker controlo. O ControlBindingsCollection é acedido através da DataBindings propriedade da Control classe.

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( gcnew Binding(
         "Text",ds,"customers.custName" ) );
      textBox2->DataBindings->Add( gcnew 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( gcnew 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 = gcnew Binding(
         "Text",ds,"customers.custToOrders.OrderAmount" );
      b->Parse += gcnew ConvertEventHandler(
         this, &Form1::CurrencyStringToDecimal );
      b->Format += gcnew ConvertEventHandler(
         this, &Form1::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() );
      
      // 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() );
      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"];
   }

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"];
}

Protected Sub 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. 
    Dim b As New Binding("Text", ds, "customers.custToOrders.OrderAmount")
    AddHandler b.Parse, AddressOf CurrencyStringToDecimal
    AddHandler b.Format, AddressOf 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.
    Dim bmText As BindingManagerBase = Me.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 = Me.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 = Me.BindingContext(ds, "customers.CustToOrders")
End Sub

Observações

A ligação simples de dados é realizada adicionando Binding objetos a um ControlBindingsCollection. Qualquer objeto que herde da Control classe pode aceder à ControlBindingsCollection propriedade através DataBindings da propriedade. Para uma lista de controlos de Windows que suportam ligação de dados, veja a classe Binding.

Contém ControlBindingsCollection métodos de coleção padrão como Add, Clear, e Remove.

Para obter o controlo a que pertence, ControlBindingsCollection use a Control propriedade.