CODEWITHSUNDEEP
wpfbinding
Hertzel Guinness
Hertzel Guinness

Reputation: 5950

WPF: How to bind to the name property

Can i bind to the name property? This does not seem to work:

<TextBlock Name="FordPerfect" Text="{Binding Path=Name, Mode=OneWay}"/>

Am i doing something wrong?

Edit:
Adding ElementName=FordPerfect" solved the issue. What i don't understand is why only binding to Name required this while other properties don't.

Note: Moved the second (design) issue to another question (where i should have placed in the first time...)

Thanks

Upvotes: 0

Views: 20807

Answers (3)

Mark A. Donohoe
Mark A. Donohoe

Reputation: 30458

The issue you're having is a Binding, by default, uses the DataContext of the element it's used on as its source. However you want the binding source to be the TextBlock element itself.

WPF has a class called RelativeSource which, as its name implies, sets the source relative to the binding. One of the relations you can choose is Self which does exactly what you want: sets the source of the binding to the element it's used on.

Here's the code:

<TextBlock Name="FordPerfect" Text="{Binding Name, RelativeSource={RelativeSource Self}}" />

Since you're already setting the source with RelativeSource, you don't need to specify ElementName. You also don't need Mode=OneWay as a TextBlock.TextProperty already defaults to one-way since it's output-only.

Hope this helps!

Upvotes: 0

Markus H&#252;tter
Markus H&#252;tter

Reputation: 7906

you could have more easily done this:

<TextBlock Name="FordPerfect" 
           Text="{Binding Name, Converter={StaticResource conv}, Mode=OneWay, RelativeSource={RelativeSource Self}}"/>

As to why: that textbox' DataContext is not automatically the TextBox itself. So binding to Name tries to bind to whateverObjectInDataContext.Name. So either you set the DataContext beforehand like:

<TextBlock Name="FordPerfect" DataContext={Binding RelativeSource={RelativeSource Self}} 
           Text="{Binding Name, Converter={StaticResource conv}, Mode=OneWay}"/>

... or directly set a Source for the Binding

Upvotes: 2

Vivien Ruiz
Vivien Ruiz

Reputation: 626

I would try this : 

<TextBlock Name="FordPerfect" 
 Text="{Binding ElementName=FordPerfect, Path=Name, Converter={StaticResource conv}, Mode=OneWay}"/>

This way, your TextBlock will be the context of the binding. If it does not work, watch the Output window, you should find a binding error !

Upvotes: 6

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