How to propagate Dependency Property PropertyChanged event through binding in WPF?
I have a UserControl, which contains a DependencyProperty (string) in it's code behind. The property works fine, I am setting it from the code behind, and a label on the UserControl displays it's content properly via Binding. There is no Binding exception. The problem is: If i try to Bind something from outside to the UserControl's property, the Binding works, i can see the label displaying the string, but if the code behind changes the string, i cant receive the event at the outside Property. I even put a breakpoint in it's setter, but it never occurs. So, the question is: how do I propagate the dependency property's changed event to the outside property?
c# .net wpf
asked Nov 19 '18 at 12:04
Bence MányokiBence Mányoki
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add a comment |
I have a UserControl, which contains a DependencyProperty (string) in it's code behind. The property works fine, I am setting it from the code behind, and a label on the UserControl displays it's content properly via Binding. There is no Binding exception. The problem is: If i try to Bind something from outside to the UserControl's property, the Binding works, i can see the label displaying the string, but if the code behind changes the string, i cant receive the event at the outside Property. I even put a breakpoint in it's setter, but it never occurs. So, the question is: how do I propagate the dependency property's changed event to the outside property?
c# .net wpf
asked Nov 19 '18 at 12:04
Bence MányokiBence Mányoki
1
1
Questions seeking debugging help ("why isn't this code working?") must include the desired behavior, a specific problem or error and the shortest code necessary to reproduce it in the question itself. Questions without a clear problem statement are not useful to other readers. See: How to create a Minimal, Complete, and Verifiable example
– ASh
Nov 19 '18 at 12:08
The getter and setter for a dependency property are not used for bindings (this is why your breakpoints don't get hit). You have to pass aPropertyChangedCallbackas part ofFrameworkPropertyMetadatain theDependencyProperty.Registerfunction. See this answer for more information and an example.
– Bradley Uffner
Nov 19 '18 at 12:52
Possible duplicate of How To Raise Property Changed events on a Dependency Property?
– Bradley Uffner
Nov 19 '18 at 12:54
add a comment |
I have a UserControl, which contains a DependencyProperty (string) in it's code behind. The property works fine, I am setting it from the code behind, and a label on the UserControl displays it's content properly via Binding. There is no Binding exception. The problem is: If i try to Bind something from outside to the UserControl's property, the Binding works, i can see the label displaying the string, but if the code behind changes the string, i cant receive the event at the outside Property. I even put a breakpoint in it's setter, but it never occurs. So, the question is: how do I propagate the dependency property's changed event to the outside property?
c# .net wpf
asked Nov 19 '18 at 12:04
Bence MányokiBence Mányoki
1
I have a UserControl, which contains a DependencyProperty (string) in it's code behind. The property works fine, I am setting it from the code behind, and a label on the UserControl displays it's content properly via Binding. There is no Binding exception. The problem is: If i try to Bind something from outside to the UserControl's property, the Binding works, i can see the label displaying the string, but if the code behind changes the string, i cant receive the event at the outside Property. I even put a breakpoint in it's setter, but it never occurs. So, the question is: how do I propagate the dependency property's changed event to the outside property?
c# .net wpf
c# .net wpf
asked Nov 19 '18 at 12:04
Bence MányokiBence Mányoki
1
asked Nov 19 '18 at 12:04
Bence MányokiBence Mányoki
1
asked Nov 19 '18 at 12:04
Bence MányokiBence Mányoki
1
asked Nov 19 '18 at 12:04
Bence MányokiBence Mányoki
1
asked Nov 19 '18 at 12:04
Bence MányokiBence Mányoki
1
1
1
Questions seeking debugging help ("why isn't this code working?") must include the desired behavior, a specific problem or error and the shortest code necessary to reproduce it in the question itself. Questions without a clear problem statement are not useful to other readers. See: How to create a Minimal, Complete, and Verifiable example
– ASh
Nov 19 '18 at 12:08
The getter and setter for a dependency property are not used for bindings (this is why your breakpoints don't get hit). You have to pass aPropertyChangedCallbackas part ofFrameworkPropertyMetadatain theDependencyProperty.Registerfunction. See this answer for more information and an example.
– Bradley Uffner
Nov 19 '18 at 12:52
Possible duplicate of How To Raise Property Changed events on a Dependency Property?
– Bradley Uffner
Nov 19 '18 at 12:54
add a comment |
1
Questions seeking debugging help ("why isn't this code working?") must include the desired behavior, a specific problem or error and the shortest code necessary to reproduce it in the question itself. Questions without a clear problem statement are not useful to other readers. See: How to create a Minimal, Complete, and Verifiable example
– ASh
Nov 19 '18 at 12:08
The getter and setter for a dependency property are not used for bindings (this is why your breakpoints don't get hit). You have to pass aPropertyChangedCallbackas part ofFrameworkPropertyMetadatain theDependencyProperty.Registerfunction. See this answer for more information and an example.
– Bradley Uffner
Nov 19 '18 at 12:52
Possible duplicate of How To Raise Property Changed events on a Dependency Property?
– Bradley Uffner
Nov 19 '18 at 12:54
1
1
Questions seeking debugging help ("why isn't this code working?") must include the desired behavior, a specific problem or error and the shortest code necessary to reproduce it in the question itself. Questions without a clear problem statement are not useful to other readers. See: How to create a Minimal, Complete, and Verifiable example
– ASh
Nov 19 '18 at 12:08
Questions seeking debugging help ("why isn't this code working?") must include the desired behavior, a specific problem or error and the shortest code necessary to reproduce it in the question itself. Questions without a clear problem statement are not useful to other readers. See: How to create a Minimal, Complete, and Verifiable example
– ASh
Nov 19 '18 at 12:08
The getter and setter for a dependency property are not used for bindings (this is why your breakpoints don't get hit). You have to pass a
PropertyChangedCallback as part of FrameworkPropertyMetadata in the DependencyProperty.Register function. See this answer for more information and an example.– Bradley Uffner
Nov 19 '18 at 12:52
The getter and setter for a dependency property are not used for bindings (this is why your breakpoints don't get hit). You have to pass a
PropertyChangedCallback as part of FrameworkPropertyMetadata in the DependencyProperty.Register function. See this answer for more information and an example.– Bradley Uffner
Nov 19 '18 at 12:52
Possible duplicate of How To Raise Property Changed events on a Dependency Property?
– Bradley Uffner
Nov 19 '18 at 12:54
Possible duplicate of How To Raise Property Changed events on a Dependency Property?
– Bradley Uffner
Nov 19 '18 at 12:54
add a comment |
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Questions seeking debugging help ("why isn't this code working?") must include the desired behavior, a specific problem or error and the shortest code necessary to reproduce it in the question itself. Questions without a clear problem statement are not useful to other readers. See: How to create a Minimal, Complete, and Verifiable example
– ASh
Nov 19 '18 at 12:08
The getter and setter for a dependency property are not used for bindings (this is why your breakpoints don't get hit). You have to pass a
PropertyChangedCallbackas part ofFrameworkPropertyMetadatain theDependencyProperty.Registerfunction. See this answer for more information and an example.– Bradley Uffner
Nov 19 '18 at 12:52
Possible duplicate of How To Raise Property Changed events on a Dependency Property?
– Bradley Uffner
Nov 19 '18 at 12:54