IBindingList Interface

Definición

Proporciona las características necesarias para admitir escenarios tanto complejos como simples en el momento de enlazar a un origen de datos. Provides the features required to support both complex and simple scenarios when binding to a data source.

public interface IBindingList : System.Collections.IList
Derivado
Implementaciones

Ejemplos

El ejemplo siguiente proporciona una implementación simple de la IBindingList interfaz.The following example provides a simple implementation of the IBindingList interface. La CustomerList clase almacena información de clientes en una lista.The CustomerList class stores customer information in a list. En este ejemplo se da por supuesto que ha usado el Customer clase que puede encontrarse en el ejemplo de la IEditableObject clase.This example assumes that you have used the Customer class that can be found in the example in the IEditableObject class.

public ref class CustomersList: public CollectionBase, public IBindingList
{
private:
   ListChangedEventArgs^ resetEvent;
   ListChangedEventHandler^ onListChanged;
   virtual event ListChangedEventHandler^ ListChanged;

public:
   property bool AllowEdit 
   {
      // Implements IBindingList.
      virtual bool get() sealed
      {
         return true;
      }
   }

   virtual property bool AllowNew 
   {
      bool get()
      {
         return true;
      }
   }

   property bool AllowRemove 
   {
      virtual bool get()
      {
         return true;
      }

   }

   property bool SupportsChangeNotification 
   {
      virtual bool get()
      {
         return true;
      }

   }

   property bool SupportsSearching 
   {
      virtual bool get()
      {
         return true;
      }

   }

   property bool SupportsSorting 
   {
      virtual bool get()
      {
         return true;
      }

   }

   // Methods.
   virtual Object^ AddNew()
   {
      Customer^ c = gcnew Customer( this->Count->ToString() );
      List->Add( c );
      return c;
   }


   property bool IsSorted 
   {

      // Unsupported properties.
      virtual bool get()
      {
         throw gcnew NotSupportedException;
         return false;
      }

   }

   property ListSortDirection SortDirection 
   {
      virtual ListSortDirection get()
      {
         throw gcnew NotSupportedException;
         return ListSortDirection::Ascending;
      }

   }

   property PropertyDescriptor^ SortProperty 
   {
      virtual PropertyDescriptor^ get()
      {
         throw gcnew NotSupportedException;
         return nullptr;
      }

   }

   // Unsupported Methods.
   virtual void AddIndex( PropertyDescriptor^ property )
   {
      throw gcnew NotSupportedException;
   }

   virtual void ApplySort( PropertyDescriptor^ property, ListSortDirection direction )
   {
      throw gcnew NotSupportedException;
   }

   virtual int Find( PropertyDescriptor^ property, Object^ key )
   {
      throw gcnew NotSupportedException;
      return 0;
   }

   virtual void RemoveIndex( PropertyDescriptor^ property )
   {
      throw gcnew NotSupportedException;
   }

   virtual void RemoveSort()
   {
      throw gcnew NotSupportedException;
   }


   // Worker functions to populate the list with data.
   static Customer^ ReadCustomer1()
   {
      Customer^ cust = gcnew Customer( "536-45-1245" );
      cust->FirstName = "Jo";
      cust->LastName = "Brown";
      return cust;
   }

   static Customer^ ReadCustomer2()
   {
      Customer^ cust = gcnew Customer( "246-12-5645" );
      cust->FirstName = "Robert";
      cust->LastName = "Brown";
      return cust;
   }

protected:
   virtual void OnListChanged( ListChangedEventArgs^ ev )
   {
      if ( onListChanged != nullptr )
      {
         onListChanged( this, ev );
      }
   }

   virtual void OnClear() override
   {
      List->Clear();
   }

   virtual void OnClearComplete() override
   {
      OnListChanged( resetEvent );
   }

   virtual void OnInsertComplete( int index, Object^ value ) override
   {
      Customer^ c = safe_cast<Customer^>(value);
      c->Parent = this;
      OnListChanged( gcnew ListChangedEventArgs( ListChangedType::ItemAdded,index ) );
   }

   virtual void OnRemoveComplete( int index, Object^ value ) override
   {
      Customer^ c = safe_cast<Customer^>(value);
      c->Parent = this;
      OnListChanged( gcnew ListChangedEventArgs( ListChangedType::ItemDeleted,index ) );
   }

   virtual void OnSetComplete( int index, Object^ oldValue, Object^ newValue ) override
   {
      if ( oldValue != newValue )
      {
         Customer^ oldcust = safe_cast<Customer^>(oldValue);
         Customer^ newcust = safe_cast<Customer^>(newValue);
         oldcust->Parent = 0;
         newcust->Parent = this;
         OnListChanged( gcnew ListChangedEventArgs( ListChangedType::ItemAdded,index ) );
      }
   }

public:

   // Constructor
   CustomersList()
   {
      resetEvent = gcnew ListChangedEventArgs( ListChangedType::Reset,-1 );
   }

   void LoadCustomers()
   {
      IList^ l = static_cast<IList^>(this);
      l->Add( ReadCustomer1() );
      l->Add( ReadCustomer2() );
      OnListChanged( resetEvent );
   }

   property Object^ Item [int]
   {
      Object^ get( int index )
      {
         return static_cast<Customer^>(List->Item[ index ]);
      }

      void set( int index, Object^ value )
      {
         List->Item[ index ] = value;
      }

   }
   int Add( Customer^ value )
   {
      return List->Add( value );
   }

   Customer^ AddNew()
   {
      return safe_cast<Customer^>(static_cast<IBindingList^>(this)->AddNew());
   }

   void Remove( Customer^ value )
   {
      List->Remove( value );
   }

internal:

   // Called by Customer when it changes.
   void CustomerChanged( Customer^ cust )
   {
      int index = List->IndexOf( cust );
      OnListChanged( gcnew ListChangedEventArgs( ListChangedType::ItemChanged,index ) );
   }

};
public class CustomersList :  CollectionBase, IBindingList
{
   
	private ListChangedEventArgs resetEvent = new ListChangedEventArgs(ListChangedType.Reset, -1);
	private ListChangedEventHandler onListChanged;

	public void LoadCustomers() 
	{
		IList l = (IList)this;
		l.Add(ReadCustomer1());
		l.Add(ReadCustomer2());
		OnListChanged(resetEvent);
	}

	public Customer this[int index] 
	{
		get 
		{
			return (Customer)(List[index]);
		}
		set 
		{
			List[index] = value;
		}
	}

	public int Add (Customer value) 
	{
		return List.Add(value);
	}

	public Customer AddNew() 
	{
		return (Customer)((IBindingList)this).AddNew();
	}

	public void Remove (Customer value) 
	{
		List.Remove(value);
	}

       
	protected virtual void OnListChanged(ListChangedEventArgs ev) 
	{
		if (onListChanged != null) 
		{
			onListChanged(this, ev);
		}
	}
       

	protected override void OnClear() 
	{
		foreach (Customer c in List) 
		{
			c.Parent = null;
		}
	}

	protected override void OnClearComplete() 
	{
		OnListChanged(resetEvent);
	}

	protected override void OnInsertComplete(int index, object value) 
	{
		Customer c = (Customer)value;
		c.Parent = this;
		OnListChanged(new ListChangedEventArgs(ListChangedType.ItemAdded, index));
	}

	protected override void OnRemoveComplete(int index, object value) 
	{
		Customer c = (Customer)value;
		c.Parent = this;
		OnListChanged(new ListChangedEventArgs(ListChangedType.ItemDeleted, index));
	}

	protected override void OnSetComplete(int index, object oldValue, object newValue) 
	{
		if (oldValue != newValue) 
		{

			Customer oldcust = (Customer)oldValue;
			Customer newcust = (Customer)newValue;
               
			oldcust.Parent = null;
			newcust.Parent = this;
               
			
			OnListChanged(new ListChangedEventArgs(ListChangedType.ItemAdded, index));
		}
	}
       
	// Called by Customer when it changes.
	internal void CustomerChanged(Customer cust) 
	{
		
		int index = List.IndexOf(cust);
           
		OnListChanged(new ListChangedEventArgs(ListChangedType.ItemChanged, index));
	}
       

	// Implements IBindingList.
	bool IBindingList.AllowEdit 
	{ 
		get { return true ; }
	}

	bool IBindingList.AllowNew 
	{ 
		get { return true ; }
	}

	bool IBindingList.AllowRemove 
	{ 
		get { return true ; }
	}

	bool IBindingList.SupportsChangeNotification 
	{ 
		get { return true ; }
	}
       
	bool IBindingList.SupportsSearching 
	{ 
		get { return false ; }
	}

	bool IBindingList.SupportsSorting 
	{ 
		get { return false ; }
	}


	// Events.
	public event ListChangedEventHandler ListChanged 
	{
		add 
		{
			onListChanged += value;
		}
		remove 
		{
			onListChanged -= value;
		}
	}

	// Methods.
	object IBindingList.AddNew() 
	{
		Customer c = new Customer(this.Count.ToString());
		List.Add(c);
		return c;
	}


	// Unsupported properties.
	bool IBindingList.IsSorted 
	{ 
		get { throw new NotSupportedException(); }
	}

	ListSortDirection IBindingList.SortDirection 
	{ 
		get { throw new NotSupportedException(); }
	}


	PropertyDescriptor IBindingList.SortProperty 
	{ 
		get { throw new NotSupportedException(); }
	}


	// Unsupported Methods.
	void IBindingList.AddIndex(PropertyDescriptor property) 
	{
		throw new NotSupportedException(); 
	}

	void IBindingList.ApplySort(PropertyDescriptor property, ListSortDirection direction) 
	{
		throw new NotSupportedException(); 
	}

	int IBindingList.Find(PropertyDescriptor property, object key) 
	{
		throw new NotSupportedException(); 
	}

	void IBindingList.RemoveIndex(PropertyDescriptor property) 
	{
		throw new NotSupportedException(); 
	}

	void IBindingList.RemoveSort() 
	{
		throw new NotSupportedException(); 
	}

	// Worker functions to populate the list with data.
	private static Customer ReadCustomer1() 
	{
		Customer cust = new Customer("536-45-1245");
		cust.FirstName = "Jo";
		cust.LastName = "Brown";
		return cust;
	}
       
	private static Customer ReadCustomer2() 
	{
		Customer cust = new Customer("246-12-5645");
		cust.FirstName = "Robert";
		cust.LastName = "Brown";
		return cust;
	}
}

Public Class CustomersList
    Inherits CollectionBase
    Implements IBindingList 

    Private resetEvent As New ListChangedEventArgs(ListChangedType.Reset, -1)
    Private onListChanged1 As ListChangedEventHandler


    Public Sub LoadCustomers()
        Dim l As IList = CType(Me, IList)
        l.Add(ReadCustomer1())
        l.Add(ReadCustomer2())
        OnListChanged(resetEvent)
    End Sub 


    Default Public Property Item(ByVal index As Integer) As Customer
        Get
            Return CType(List(index), Customer)
        End Get
        Set(ByVal Value As Customer)
            List(index) = Value
        End Set
    End Property


    Public Function Add(ByVal value As Customer) As Integer
        Return List.Add(value)
    End Function 


    Public Function AddNew2() As Customer
        Return CType(CType(Me, IBindingList).AddNew(), Customer)
    End Function 


    Public Sub Remove(ByVal value As Customer)
        List.Remove(value)
    End Sub 



    Protected Overridable Sub OnListChanged(ByVal ev As ListChangedEventArgs)
        If (onListChanged1 IsNot Nothing) Then
            onListChanged1(Me, ev)
        End If
    End Sub 



    Protected Overrides Sub OnClear()
        Dim c As Customer
        For Each c In List
            c.parent = Nothing
        Next c
    End Sub 


    Protected Overrides Sub OnClearComplete()
        OnListChanged(resetEvent)
    End Sub 


    Protected Overrides Sub OnInsertComplete(ByVal index As Integer, ByVal value As Object)
        Dim c As Customer = CType(value, Customer)
        c.parent = Me
        OnListChanged(New ListChangedEventArgs(ListChangedType.ItemAdded, index))
    End Sub 


    Protected Overrides Sub OnRemoveComplete(ByVal index As Integer, ByVal value As Object)
        Dim c As Customer = CType(value, Customer)
        c.parent = Me
        OnListChanged(New ListChangedEventArgs(ListChangedType.ItemDeleted, index))
    End Sub 


    Protected Overrides Sub OnSetComplete(ByVal index As Integer, ByVal oldValue As Object, ByVal newValue As Object)
        If oldValue <> newValue Then

            Dim oldcust As Customer = CType(oldValue, Customer)
            Dim newcust As Customer = CType(newValue, Customer)

            oldcust.parent = Nothing
            newcust.parent = Me

            OnListChanged(New ListChangedEventArgs(ListChangedType.ItemAdded, index))
        End If
    End Sub 


    ' Called by Customer when it changes.
    Friend Sub CustomerChanged(ByVal cust As Customer)
        Dim index As Integer = List.IndexOf(cust)
        OnListChanged(New ListChangedEventArgs(ListChangedType.ItemChanged, index))
    End Sub 


    ' Implements IBindingList.

    ReadOnly Property AllowEdit() As Boolean Implements IBindingList.AllowEdit
        Get
            Return True
        End Get
    End Property

    ReadOnly Property AllowNew() As Boolean Implements IBindingList.AllowNew
        Get
            Return True
        End Get
    End Property

    ReadOnly Property AllowRemove() As Boolean Implements IBindingList.AllowRemove
        Get
            Return True
        End Get
    End Property

    ReadOnly Property SupportsChangeNotification() As Boolean Implements IBindingList.SupportsChangeNotification
        Get
            Return True
        End Get
    End Property

    ReadOnly Property SupportsSearching() As Boolean Implements IBindingList.SupportsSearching
        Get
            Return False
        End Get
    End Property

    ReadOnly Property SupportsSorting() As Boolean Implements IBindingList.SupportsSorting
        Get
            Return False
        End Get
    End Property

    ' Events.
    Public Event ListChanged As ListChangedEventHandler Implements IBindingList.ListChanged


    ' Methods.
    Function AddNew() As Object Implements IBindingList.AddNew
        Dim c As New Customer(Me.Count.ToString())
        List.Add(c)
        Return c
    End Function 


    ' Unsupported properties.

    ReadOnly Property IsSorted() As Boolean Implements IBindingList.IsSorted
        Get
            Throw New NotSupportedException()
        End Get
    End Property

    ReadOnly Property SortDirection() As ListSortDirection Implements IBindingList.SortDirection
        Get
            Throw New NotSupportedException()
        End Get
    End Property


    ReadOnly Property SortProperty() As PropertyDescriptor Implements IBindingList.SortProperty
        Get
            Throw New NotSupportedException()
        End Get
    End Property


    ' Unsupported Methods.
    Sub AddIndex(ByVal prop As PropertyDescriptor) Implements IBindingList.AddIndex
        Throw New NotSupportedException()
    End Sub 


    Sub ApplySort(ByVal prop As PropertyDescriptor, ByVal direction As ListSortDirection) Implements IBindingList.ApplySort
        Throw New NotSupportedException()
    End Sub 


    Function Find(ByVal prop As PropertyDescriptor, ByVal key As Object) As Integer Implements IBindingList.Find
        Throw New NotSupportedException()
    End Function 


    Sub RemoveIndex(ByVal prop As PropertyDescriptor) Implements IBindingList.RemoveIndex
        Throw New NotSupportedException()
    End Sub 


    Sub RemoveSort() Implements IBindingList.RemoveSort
        Throw New NotSupportedException()
    End Sub 


    ' Worker functions to populate the list with data.
    Private Shared Function ReadCustomer1() As Customer
        Dim cust As New Customer("536-45-1245")
        cust.FirstName = "Jo"
        cust.LastName = "Brown"
        Return cust
    End Function 


    Private Shared Function ReadCustomer2() As Customer
        Dim cust As New Customer("246-12-5645")
        cust.FirstName = "Robert"
        cust.LastName = "Brown"
        Return cust
    End Function 
End Class

Comentarios

Esta interfaz se implementa mediante el DataView clase.This interface is implemented by the DataView class. Implementación de un método debe presentar el mismo comportamiento que la implementación de ese método en la DataView clase.Implementation of a method should exhibit the same behavior as the implementation of that method in the DataView class.

Cuando se llama a la ApplySort o RemoveSort métodos, debe generar un ListChanged evento con el Reset enumeración.When you call the ApplySort or RemoveSort methods, you should raise a ListChanged event with the Reset enumeration.

Cuando se llama a la AddNew método, debe generar un ListChanged evento con el ItemAdded enumeración incluya el índice adecuado.When you call the AddNew method, you should raise a ListChanged event with the ItemAdded enumeration carrying the appropriate index. La fila agregada está en un estado donde si se presiona la tecla ESC en un DataGridView control puede quitar la nueva fila.The added row is in a state where pressing the ESC on a DataGridView control can remove the new row. Generar el ListChanged evento con el ItemAdded enumeración una segunda vez en esta fila indica que el elemento es ahora una fila no está en el estado "nuevo".Raising the ListChanged event with the ItemAdded enumeration a second time on this row indicates that the item is now a row not in the "new" state.

Al quitar un elemento o una llamada a la CancelEdit método en una nueva fila (si implementa la fila IEditableObject), debe generar un ListChanged evento con el ItemDeleted enumeración incluya el índice adecuado.When you remove an item or call the CancelEdit method on a new row (if that row implements IEditableObject), you should raise a ListChanged event with the ItemDeleted enumeration carrying the appropriate index.

Propiedades

AllowEdit

Obtiene si se pueden actualizar los elementos de la lista. Gets whether you can update items in the list.

AllowNew

Obtiene si se pueden agregar elementos a la lista mediante AddNew(). Gets whether you can add items to the list using AddNew().

AllowRemove

Obtiene si se pueden quitar elementos de la lista mediante Remove(Object) o RemoveAt(Int32). Gets whether you can remove items from the list, using Remove(Object) or RemoveAt(Int32).

IsSorted

Obtiene si están ordenados los elementos de la lista. Gets whether the items in the list are sorted.

SortDirection

Obtiene la dirección de la ordenación. Gets the direction of the sort.

SortProperty

Obtiene PropertyDescriptor que se utiliza para ordenar. Gets the PropertyDescriptor that is being used for sorting.

SupportsChangeNotification

Obtiene si se provoca un evento ListChanged cuando cambia la lista o un elemento de la lista. Gets whether a ListChanged event is raised when the list changes or an item in the list changes.

SupportsSearching

Obtiene si la lista admite búsquedas mediante el método Find(PropertyDescriptor, Object). Gets whether the list supports searching using the Find(PropertyDescriptor, Object) method.

SupportsSorting

Obtiene si la lista admite la ordenación. Gets whether the list supports sorting.

Métodos

AddIndex(PropertyDescriptor)

Agrega PropertyDescriptor a los índices utilizados para las búsquedas. Adds the PropertyDescriptor to the indexes used for searching.

AddNew()

Agrega un nuevo elemento a la lista. Adds a new item to the list.

ApplySort(PropertyDescriptor, ListSortDirection)

Ordena la lista basándose en PropertyDescriptor y ListSortDirection. Sorts the list based on a PropertyDescriptor and a ListSortDirection.

Find(PropertyDescriptor, Object)

Devuelve el índice de la fila que tiene el PropertyDescriptor especificado. Returns the index of the row that has the given PropertyDescriptor.

RemoveIndex(PropertyDescriptor)

Quita el PropertyDescriptor de los índices utilizados para las búsquedas. Removes the PropertyDescriptor from the indexes used for searching.

RemoveSort()

Quita cualquier ordenación aplicada mediante el ApplySort(PropertyDescriptor, ListSortDirection). Removes any sort applied using ApplySort(PropertyDescriptor, ListSortDirection).

Eventos

ListChanged

Se produce cuando cambia la lista o un elemento de la lista. Occurs when the list changes or an item in the list changes.

Se aplica a