BindingManagerBase.Current Propiedad

Definición

Cuando se reemplaza en una clase derivada, se obtiene el objeto actual.When overridden in a derived class, gets the current object.

public:
 abstract property System::Object ^ Current { System::Object ^ get(); };
public abstract object Current { get; }
member this.Current : obj
Public MustOverride ReadOnly Property Current As Object

Valor de propiedad

Object

Object que representa el objeto actual.An Object that represents the current object.

Ejemplos

En el ejemplo de código siguiente se imprime el valor del Current objeto en un BindingManagerBase en el CurrentChanged evento.The following code example prints the value of the Current object in a BindingManagerBase in the CurrentChanged event. En el ejemplo se supone que el origen de datos es un DataTable que contiene un DataColumn denominado CustName .The example assumes the data source is a DataTable containing a DataColumn named CustName.

void Current_Changed( Object^ sender, EventArgs^ /*e*/ )
{
   BindingManagerBase^ bm = dynamic_cast<BindingManagerBase^>(sender);
   
   /* Check the type of the Current object. If it is not a 
           DataRowView, exit the method. */
   if ( bm->Current->GetType() != DataRowView::typeid )
         return;

   // Otherwise, print the value of the column named "CustName".
   DataRowView^ drv = dynamic_cast<DataRowView^>(bm->Current);
   Console::Write( "CurrentChanged): " );
   Console::Write( drv[ "CustName" ] );
   Console::WriteLine();
}
private void Current_Changed(object sender, EventArgs e)
{
    BindingManagerBase bm = (BindingManagerBase) sender;
    /* Check the type of the Current object. If it is not a 
    DataRowView, exit the method. */
    if(bm.Current.GetType() != typeof(DataRowView)) return;

    // Otherwise, print the value of the column named "CustName".
    DataRowView drv = (DataRowView) bm.Current;
    Console.Write("CurrentChanged): ");
    Console.Write(drv["CustName"]);
    Console.WriteLine();
}
Private Sub Current_Changed(sender As Object, e As EventArgs)
    Dim bm As BindingManagerBase = CType(sender, BindingManagerBase)
    ' Check the type of the Current object. If it is not a
    ' DataRowView, exit the method. 
    If bm.Current.GetType() IsNot GetType(DataRowView) Then
        Return
    End If 
    ' Otherwise, print the value of the column named "CustName".
    Dim drv As DataRowView = CType(bm.Current, DataRowView)
    Console.Write("CurrentChanged): ")
    Console.Write(drv("CustName"))
    Console.WriteLine()
End Sub

Comentarios

El Current objeto contiene el valor del elemento actual en el origen de datos.The Current object contains the value of the current item in the data source. Para usar el valor del elemento actual, debe convertir el elemento al Type del objeto incluido en DataSource .To use the value of the current item, you must cast the item to the Type of the object contained by the DataSource. Por ejemplo, un DataTable contiene DataRowView objetos.For example, a DataTable contains DataRowView objects. Para determinar el tipo del objeto actual, use los GetType métodos y ToString .To determine the type of the current object, use the GetType and ToString methods.

Nota

Cuando DataSource es DataSet , DataViewManager o DataTable , en realidad se enlaza a DataView .When the DataSource is a DataSet, DataViewManager, or DataTable, you are actually binding to a DataView. Por consiguiente, cada Current objeto es un DataRowView objeto.Consequently, each Current object is a DataRowView object.

Se aplica a

Consulte también