Export (0) Print
Expand All

IMultiValueConverter.ConvertBack Method

Converts a binding target value to the source binding values.

Namespace:  System.Windows.Data
Assembly:  PresentationFramework (in PresentationFramework.dll)

abstract ConvertBack : 
        value:Object * 
        targetTypes:Type[] * 
        parameter:Object * 
        culture:CultureInfo -> Object[] 

Parameters

value
Type: System.Object

The value that the binding target produces.

targetTypes
Type: System.Type[]

The array of types to convert to. The array length indicates the number and types of values that are suggested for the method to return.

parameter
Type: System.Object

The converter parameter to use.

culture
Type: System.Globalization.CultureInfo

The culture to use in the converter.

Return Value

Type: System.Object[]
An array of values that have been converted from the target value back to the source values.

If there are more return values than there are bindings in the MultiBinding, the excess return values are ignored. If there are more source bindings than there are return values, the remaining source bindings do not have any values set on them. Types of return values are not verified against targetTypes; the values are set on the source bindings directly.

Return DoNothing at position i to indicate that no value is to be set on the source binding at index i.

Return DependencyProperty.UnsetValue at position i to indicate that the converter is unable to provide a value for the source binding at index i, and that no value is to be set on it.

Return a null reference (Nothing in Visual Basic) to indicate that the converter cannot perform the conversion or that it does not support conversion in this direction.

The data binding engine does not catch exceptions that are thrown by a user-supplied converter. Any exception that is thrown by the ConvertBack method or any uncaught exceptions that are thrown by methods that the ConvertBack method calls are treated as run-time errors. Handle anticipated problems by returning a null reference (Nothing in Visual Basic).

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
Show:
© 2015 Microsoft