What are the defaults for Binding.Mode=Default for WPF controls?

.net wpf binding dependency-properties binding-mode
Shimmy Weitzhandler picture Shimmy Weitzhandler · Nov 25, 2009 · Viewed 43.2k times · Source

In WPF Binding.Mode, when selecting Default, it depends in the property being binded.

I am looking for some list or some convention or any information for the defaults for the various controls.
I mean, what properties are TwoWay by default and so on. Any links, ideas, thoughts and even rants are welcommed!

Answer

Lars Truijens picture Lars Truijens · Nov 25, 2009

Similar to UpdateSourceTrigger, the default value for the Mode property varies for each property. User-editable properties such as TextBox.Text, ComboBox.Text, MenuItem.IsChecked, etc, have TwoWay as their default Mode value. To figure out if the default is TwoWay, look at the Dependency Property Information section of the property. If it says 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.

Source: https://web.archive.org/web/20100209025938/http://blogs.msdn.com/wpfsdk/archive/2006/10/19/wpf-basic-data-binding-faq.aspx

The safest way would be to always be explicit what kind of binding mode you want from a binding.

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