How to use x:Bind without any property

Question

In Windows 8.1, I can do this

<Grid Margin="8"
      VerticalAlignment="Bottom"
      Tapped="Grid_OnTapped"
      Tag="{Binding}"></Grid>

then inside event Grid_OnTapped, I can use the Tag property of Grid to know which item is tapped.

But when change to x:Bind, it's no longer work. Exception throwed: "Object reference is not set to an instance of an object"

Further test, this code will display the name of the class

<TextBlock Text="{x:Bind}/>

But that the only thing work

Please help. Thanks

Could you show the code of your constructor?

Stefan Over
– Stefan Over

2015-10-23 09:10:34 +00:00
Commented Oct 23, 2015 at 9:10 — Stefan Over
– Stefan Over, Commented Oct 23, 2015 at 9:10

Mike Eason · Accepted Answer · 2015-10-23 19:47:00Z

1

{x:Bind} is for binding to properties in the code-behind of the view. It has a performance advantage over {Binding} because normal binding uses reflection to find properties, whereas x:Bind does not. x:Bind will bind to strongly typed properties in the code-behind.

Generally, you would use x:Bind to gain performance in XAML.

In your case, it would be a better idea to bind the to DataContext instead, in your case, is just {Binding}. Which is what you have already done previously.

Perhaps you have misunderstood the usage of x:Bind? Here's an article explaining how it should be used.

answered Oct 23, 2015 at 19:47

Mike Eason

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2 Comments

Hunter Tran Over a year ago

Thanks. I misunderstood of x:Bind. Thought it was {Binding} replacement. Turn out this is a whole new mechanism.

IInspectable Over a year ago

Arguably, the far more important improvement of {x:Bind} over {Binding} is the maintainability aspect. It performs compile-time validation, catching bugs as early as possible. Also worth noting: {x:Bind} can be used with functions just as well. It is not exclusively for properties (see {x:Bind} markup extension).

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