Gets or sets the BindingContext for the control.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
'Declaration <BrowsableAttribute(False)> _ Public Overridable Property BindingContext As BindingContext 'Usage Dim instance As Control Dim value As BindingContext value = instance.BindingContext instance.BindingContext = value
The 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.
When overriding the property in a derived class, use the base class's 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 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.
Protected Sub 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 the string ' "TableName.ColumnName". text1.DataBindings.Add(New Binding _ ("Text", ds, "customers.custName")) text2.DataBindings.Add(New Binding _ ("Text", ds, "customers.custID")) ' Bind the DateTimePicker control by adding a new Binding. ' The data member of the DateTimePicker is a ' TableName.RelationName.ColumnName string. DateTimePicker1.DataBindings.Add(New 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. Dim b As Binding = New Binding _ ("Text", ds, "customers.custToOrders.OrderAmount") AddHandler b.Parse, New ConvertEventHandler(AddressOf CurrencyStringToDecimal) AddHandler b.Format, New ConvertEventHandler(AddressOf DecimalToCurrencyString) text3.DataBindings.Add(b) ' Get the BindingManagerBase for the Customers table. bmCustomers = Me.BindingContext(ds, "Customers") ' Get the BindingManagerBase for the Orders table using the ' RelationName. bmOrders = Me.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") End Sub
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The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.