ControlBindingsCollection.Item[String] Vlastnost

Definice

Obor názvů:

System.Windows.Forms

Sestavení:

System.Windows.Forms.dll

Binding Získá zadaný názvem vlastnosti ovládacího prvku.

public:
 property System::Windows::Forms::Binding ^ default[System::String ^] { System::Windows::Forms::Binding ^ get(System::String ^ propertyName); };

public System.Windows.Forms.Binding this[string propertyName] { get; }

member this.Item(string) : System.Windows.Forms.Binding

Default Public ReadOnly Property Item(propertyName As String) As Binding

Parametry

propertyName

String

Název vlastnosti ovládacího prvku vázaného na data.

Hodnota vlastnosti

Binding

Ten Binding sváže zadanou vlastnost ovládacího prvku ke zdroji dat.

Příklady

Následující příklad kódu vrátí jeden Binding z ControlBindingsCollection.

void PrintValue()
{
   ControlBindingsCollection^ myControlBindings;
   myControlBindings = textBox1->DataBindings;
   
   // Get the Binding for the Text property.
   Binding^ myBinding = myControlBindings[ "Text" ];
   
   // Assuming the data source is a DataTable.
   DataRowView^ drv;
   drv = dynamic_cast<DataRowView^>(myBinding->BindingManagerBase->Current);
   
   // Assuming a column named S"custName" exists, print the value.
   Console::WriteLine( drv[ "custName" ] );
}

private void PrintValue()
{
   ControlBindingsCollection myControlBindings;
   myControlBindings = textBox1.DataBindings;

   // Get the Binding for the Text property.
   Binding myBinding = myControlBindings["Text"];

   // Assuming the data source is a DataTable.
   DataRowView drv;
   drv = (DataRowView) myBinding.BindingManagerBase.Current;

   // Assuming a column named "custName" exists, print the value.
   Console.WriteLine(drv["custName"]);
}

Private Sub PrintValue()

   Dim myControlBindings As ControlBindingsCollection = _
   textBox1.DataBindings

   ' Get the Binding for the Text property.
   Dim myBinding As Binding = myControlBindings("Text")

   ' Assuming the data source is a DataTable.
   Dim drv As DataRowView = _
   CType( myBinding.BindingManagerBase.Current, DataRowView)

   ' Assuming a column named "custName" exists, print the value.
   Console.WriteLine(drv("custName"))
End Sub

Poznámky

Pokud zadaná vlastnost neodpovídá vazbě v kolekci, Item[] vrátí nullhodnotu .