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#1 Posted : Thursday, February 9, 2017 9:26:39 PM(UTC)

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Joined: 11/23/2008(UTC)
Posts: 522

WPF OneWay or TwoWay binding and defaults

User-editable properties such as TextBox.Text, ComboBox.Text, MenuItem.IsChecked, etc, have TwoWay as their default Mode value. Other read-only fields are OneWay. So the default value for the Mode property varies.

To figure out whether the default is Oneway or TwoWay, look at the Dependency Property Information section of the property. If BindsTwoWayByDefault is set to true, then the default Mode value of the property is TwoWay.

To do it programmatically, get the property metadata of the property by calling GetMetadata and then check the boolean value of the BindsTwoWayByDefault property. You can also use a .Net reflection tool, such as .Net Reflecor, to find it out.

Textbox binding update in WPF

If the text is changed programmatically, eg. a value change on slider control updates its associated text box value, use two way binding update for a text box associated with a slider control when the value of the slider is changed.
<Binding Path="property" Mode="TwoWay" UpdateSourceTrigger="PropertyChanged">

Edited by user Wednesday, February 22, 2017 7:22:33 PM(UTC)  | Reason: Not specified

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