WPF Binding with RelativeSource Self

Question

I am confused with whn to use {RelativeSource Self} when binding. The below three bindings look the same to me, where MyText is a property in my view model.

<TextBlock Text = "{Binding Path=MyText RelativeSource{RelativeSource Self} }" />
<TextBlock Text = "{Binding MyText RelativeSource{RelativeSource Self} }" />
<TextBlock Text = "{Binding MyText }" />

When should I use Self in my binding? Thanks.

Thomas Levesque · Accepted Answer · 2014-11-15 14:38:20Z

3

The first two are equivalent, and bind to the MyText property of the TextBlock itself. But of course, they don't work, because there is no MyText property on TextBlock.

The third binds to the MyText property of the current DataContext

Use RelativeSource.Self when you need to bind to a property of the current control.

answered Nov 15, 2014 at 14:38

Thomas Levesque

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4 Comments

Helic Over a year ago

Thanks for the clarification. And the DataContext of TextBlock should be the same as its parent's if not specified?

Thomas Levesque Over a year ago

@Helic, yes. The value of the DataContext is inherited by child elements, unless explicitly replaced.

Helic Over a year ago

also if I define a control template to replace the default display template for a control, what is the data context for textblock?<dxe:ComboBoxEdit.DisplayTemplate> <ControlTemplate> <TextBlock Text="{Binding RowData.Row.Cities3, Converter={StaticResource TestConverter}}"></TextBlock> </ControlTemplate> </dxe:ComboBoxEdit.DisplayTemplate>

Thomas Levesque Over a year ago

@Helic, it depends on where the control is instantiated. The control template doesn't change anything about that. But anyway, in most cases a control template shouldn't try to use the DataContext. That's what DataTemplates are here for.

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