TextBlock trigger does not work

The "{Binding ElementName=flashControl, Path=FileOpened}" nicely works elsewhere except this trigger.

What am I doing wrong?...

Hi Markovalex,

The provided XAML code uses a DataTrigger to adjust properties of a TextBlock based on the FileOpened property from the flashControl element. If the binding works elsewhere but not in this trigger, consider these points:

Scope and Accessibility: Ensure the flashControl element is accessible within the TextBlock's scope and defined in the same hierarchy.
PropertyChanged: Confirm that the FileOpened property of flashControl triggers the PropertyChanged event when it changes, allowing the binding to update.
Binding Path: Check for typos or case sensitivity issues in the binding path. The property name should match exactly.
DataContext Inheritance: Ensure the DataContext of flashControl is properly inherited or set within the relevant context.
Timing: If FileOpened changes asynchronously, the UI might not update as expected.

To troubleshoot, verify the existence of FileOpened, check for errors in your development environment's output, and consider using debugging tools to inspect runtime values. Providing more context about flashControl and its usage can aid in pinpointing the issue.

2 Replies

Know the answer? Post it — somebody with the same question will find it here.

markovalex3y ago
Hi Saravanan,

Thank you so much for your reply!!!

Here are some clarifications:

flashControl is a UserControl:

TextBlock is in it's hierarchy:

UserControl->DockPanel->ToolBar->TextBlock

Few lines above:
- works fine, PropertyChanged is triggered. No binding errors reported at runtime, FileOpened is set synchronosly.

I am in despair...
+2
Saravanan Ganesan3y ago
Hi Markovalex,

The provided XAML code uses a DataTrigger to adjust properties of a TextBlock based on the FileOpened property from the flashControl element. If the binding works elsewhere but not in this trigger, consider these points:
1. Scope and Accessibility: Ensure the flashControl element is accessible within the TextBlock's scope and defined in the same hierarchy.
2. PropertyChanged: Confirm that the FileOpened property of flashControl triggers the PropertyChanged event when it changes, allowing the binding to update.
3. Binding Path: Check for typos or case sensitivity issues in the binding path. The property name should match exactly.
4. DataContext Inheritance: Ensure the DataContext of flashControl is properly inherited or set within the relevant context.
5. Timing: If FileOpened changes asynchronously, the UI might not update as expected.
To troubleshoot, verify the existence of FileOpened, check for errors in your development environment's output, and consider using debugging tools to inspect runtime values. Providing more context about flashControl and its usage can aid in pinpointing the issue.
+2