Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Contents Exit focus mode. Binding Group Class Reference Is this page helpful? Please rate your experience Yes No. Any additional feedback? Namespace: System.
Data Assembly: PresentationFramework. In this article. Inherited from DependencyObject. Inherited from DispatcherObject. Gets a value that indicates whether this instance is currently sealed read-only.
ClearValue DependencyProperty. ClearValue DependencyPropertyKey. CoerceValue DependencyProperty. Equals Object. Inherited from Object.
GetValue DependencyProperty. GetValue Object, String. InvalidateProperty DependencyProperty. Re-evaluates the effective value for the specified dependency property. ReadLocalValue DependencyProperty. Returns the local value of a dependency property, if it exists. Sets the value of a dependency property without changing its value source.
Gets or sets a value that indicates whether the Binding should get and set values asynchronously. Gets or sets a value that indicates whether to raise the SourceUpdated event when a value is transferred from the binding target to the binding source. Gets or sets a value that indicates whether to raise the TargetUpdated event when a value is transferred from the binding source to the binding target.
Gets or sets a value that indicates whether to raise the Error attached event on the bound object. Gets or sets the binding source by specifying its location relative to the position of the binding target. Gets or sets a string that specifies how to format the binding if it displays the bound value as a string.
Gets or sets the value that is used in the target when the value of the source is null. Gets or sets a handler you can use to provide custom logic for handling exceptions that the binding engine encounters during the update of the binding source value. This is only applicable if you have associated an ExceptionValidationRule with your binding.
Gets or sets a value that indicates whether to include the DataErrorValidationRule. Gets or sets a value that indicates whether to include the ExceptionValidationRule. Adds a handler for the SourceUpdated attached event. Adds a handler for the TargetUpdated attached event. Gets the Type of the current instance.
Creates a shallow copy of the current Object. Returns an object that should be set on the property where this binding and extension are applied. Removes a handler for the SourceUpdated attached event.
Removes a handler for the TargetUpdated attached event. Returns a value that indicates whether serialization processes should serialize the effective value of the FallbackValue property on instances of this class. Here is a sample TextBlock that has a missing data context. In this situation, you will not get any errors in the Visual Studio output window. To enable tracing, I added a new xml namespace to include the System. Diagnostics namespace. You can also set the level of tracing to High , Medium , Low , or None.
You can eliminate the data binding as the problem by adding a value converter and break into the debugger. If the value is what you expected, then data binding is not your issue. Diagnostics; using System. Globalization; using System. To use the value converter, reference the namespace of the assembly that contains the converter and add an instance of it to the resources of your window.
Data; using System. Martin Lottering Martin Lottering 1, 16 16 silver badges 28 28 bronze badges. SelectedIndex is an int. You can't put a System. Binding inside an int property. Your MarkupExtension is wrong. You're returning the Binding itself instead of evaluating it and returning the Binding Source.
I don't understand. Where am I missing the boat? The Binding markup extension does not return a Binding instance, it creates the binding and returns the value in the other end the Source — Federico Berasategui. HighCore - Thank you for the explanation. That makes sense, except the markup extension works on SelectedItem. Does SelectedItem disregard the binding and assign the value instead? SelectedItem is of type object , that's why you're not getting an exception, but that doesn't mean it's working.
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