BindingContext BindingContext BindingContext Constructor

Definición

Inicializa una nueva instancia de la clase BindingContext.Initializes a new instance of the BindingContext class.

public:
 BindingContext();
public BindingContext ();
Public Sub New ()

Ejemplos

En el ejemplo de código siguiente se BindingContext crean dos objetos nuevos y se asigna cada objeto BindingContext a la propiedad GroupBox de un control.The following code example creates two new BindingContext objects and assigns each object to the BindingContext property of a GroupBox control. GroupBox1contiene TextBox1y GroupBox2 contiene AddRange Control.ControlCollection ( queselogramedianteelmétodoTextBox2 de la clase).GroupBox1 contains TextBox1, and GroupBox2 contains TextBox2 (which is accomplished by using the AddRange method of the Control.ControlCollection class). A continuación, el Binding ejemplo agrega objetos a TextBox los dos controles, enlazando cada uno con el mismo origen de datos y miembro de datos.The example then adds Binding objects to the two TextBox controls, binding each to the same data source and data member. En el ejemplo también BindingContext se muestran dos controladores de eventos que utilizan desde los GroupBox controles para establecer Position la propiedad en BindingManagerBase objetos diferentes.The example also shows two event handlers that use the BindingContext from the GroupBox controls to set the Position property on different BindingManagerBase objects.

void BindControls()
{
   System::Windows::Forms::BindingContext^ bcG1 = gcnew System::Windows::Forms::BindingContext;
   System::Windows::Forms::BindingContext^ bcG2 = gcnew System::Windows::Forms::BindingContext;
   groupBox1->BindingContext = bcG1;
   groupBox2->BindingContext = bcG2;
   textBox1->DataBindings->Add( "Text", ds, "Customers.CustName" );
   textBox2->DataBindings->Add( "Text", ds, "Customers.CustName" );
}

void Button1_Click( Object^ /*sender*/, EventArgs^ /*e*/ )
{
   groupBox1->BindingContext[ds, "Customers"]->Position = groupBox1->BindingContext[ds, "Customers"]->Position + 1;
}

void Button2_Click( Object^ /*sender*/, EventArgs^ /*e*/ )
{
   groupBox2->BindingContext[ds, "Customers"]->Position = groupBox2->BindingContext[ds, "Customers"]->Position + 1;
}

private void BindControls()
{
   BindingContext bcG1 = new BindingContext();
   BindingContext bcG2 = new BindingContext();

   groupBox1.BindingContext = bcG1;
   groupBox2.BindingContext = bcG2;

   textBox1.DataBindings.Add("Text", ds, "Customers.CustName");
   textBox2.DataBindings.Add("Text", ds, "Customers.CustName");
}

private void Button1_Click(object sender, EventArgs e)
{
   groupBox1.BindingContext[ds, "Customers"].Position += 1;         
}

private void Button2_Click(object sender, EventArgs e)
{
   groupBox2.BindingContext[ds, "Customers"].Position += 1;
}
Private Sub BindControls()
    Dim bcG1 As New BindingContext()
    Dim bcG2 As New BindingContext()
       
    groupBox1.BindingContext = bcG1
    groupBox2.BindingContext = bcG2
       
    textBox1.DataBindings.Add("Text", ds, "Customers.CustName")
    textBox2.DataBindings.Add("Text", ds, "Customers.CustName")
End Sub    
   
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
    groupBox1.BindingContext(ds, "Customers").Position += 1
End Sub    
   
Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
    groupBox2.BindingContext(ds, "Customers").Position += 1
End Sub

Comentarios

Si BindingManagerBase desea tener varias instancias para el mismo origen de datos, cree un nuevo BindingContext y establézcalo en la BindingContext propiedad de un objeto que herede de la Control clase.If you want to have multiple BindingManagerBase instances for the same data source, create a new BindingContext and set it to the BindingContext property of an object that inherits from the Control class. Por ejemplo BindingManagerBase , si tiene dos objetos (de dos objetos diferentes BindingContext ), puede establecer las Position propiedades de cada uno BindingManagerBase en valores diferentes.For example, if you have two BindingManagerBase objects (from two different BindingContext objects), you can set the Position properties of each BindingManagerBase to different values. Esto hace que cada conjunto de controles enlazados a datos muestre valores diferentes del mismo origen de datos.This causes each set of data-bound controls to display different values from the same data source.

Se aplica a

Consulte también: