Control::BindingContext Property
Gets or sets the BindingContext for the control.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
[BrowsableAttribute(false)] public: virtual property BindingContext^ BindingContext { BindingContext^ get (); void set (BindingContext^ value); }
Implements
IBindableComponent::BindingContextThe BindingContext of a Control is used to return a single BindingManagerBase for all data-bound controls contained by the Control. The BindingManagerBase keeps all controls that are bound to the same data source synchronized. For example, setting the Position property of the BindingManagerBase specifies the item in the underlying list that all data-bound controls point to.
For more information about creating a new BindingContext and assigning it to the BindingContext property, see the BindingContext.
Notes to InheritorsWhen overriding the BindingContext property in a derived class, use the base class's BindingContext property to extend the base implementation. Otherwise, you must provide all the implementation. You are not required to override both the get and set accessors of the BindingContext property; you can override only one if needed.
The following code example creates four Binding objects to bind five controls, a DateTimePicker and four TextBox controls, to several data sources. The BindingContext is then used to get the BindingManagerBase for each data source.
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 a navigation path in the form: "TableName.ColumnName". */ text1->DataBindings->Add( gcnew Binding( "Text",ds,"customers.custName" ) ); text2->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 string. */ DateTimePicker1->DataBindings->Add( gcnew Binding( "Value",ds,"customers.CustToOrders.OrderDate" ) ); /* Add event delegates for the Parse and Format events to a new 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 ); text3->DataBindings->Add( b ); // Get the BindingManagerBase for the Customers table. bmCustomers = this->BindingContext[ ds,"Customers" ]; /* Get the BindingManagerBase for the Orders table using the RelationName. */ bmOrders = this->BindingContext[ds, "customers.CustToOrders"]; /* Bind the fourth TextBox control's Text property to the third control's Text property. */ text4->DataBindings->Add( "Text", text3, "Text" ); }
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.