How do I programmatically read the value of an attached dependency property?

Question

So I have a Button with an AutomationId (used by Microsoft UI Automation) like so:

<Button Name="myButton" AutomationId="myButtonAutomationID"

Programmatically, I have the button (myButton) in code, how do I get the value of the 'AutomationId' property attached to that button?

[Check this article](http://msdn.microsoft.com/en-US/library/system.windows.automation.automationelement.automationidproperty.aspx) — Hasan Fahim, Jul 11 '11 at 15:03

score 10 · Accepted Answer · answered Jul 11 '11 at 15:02

10

DependencyObject.GetValue should do the job:

string automationId = 
    (string)myButton.GetValue(AutomationProperties.AutomationIdProperty);

answered Jul 11 '11 at 15:02

Florian Greinacher

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Can avoid the cast and improve code readability by simply calling `AutomationProperties.GetAutomationId(myButton)` – Kent Boogaart Jul 11 '11 at 18:24

score 1 · Answer 2 · answered Jul 11 '11 at 15:02

Fundamentally, just as you would with any other DependencyProperty; the ordinary properties on your object serve (or should serve) as simple wrappers around DependencyObject.GetValue and .SetValue, so all you need to do is call GetValue yourself and pass in your static readonly instance of your attached DependencyProperty:

var value = myButton.GetValue(yourDependencyProperty);

score 1 · Answer 3 · answered Jul 11 '11 at 18:25

1

var automationId = AutomationProperties.GetAutomationId(myButton);

As is standard for dependency properties, this wrapper method will do the job of calling DependencyObject.GetValue for you, and casting the value to the correct type.

answered Jul 11 '11 at 18:25

Kent Boogaart

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How do I programmatically read the value of an attached dependency property?

3 Answers3