Raising an event when the content of an user control change

Question

I have a WPF application in which i have this user control View ``` ``` I need to add an event that is raised when the content of `container` change : ``` private void container_LayoutUpdated_1(object sender, EventArgs e) { Thread windowThread2 = new Thread(delegate() { verifing2(); }); windowThread2.SetApartmentState(ApartmentState.STA); windowThread2.IsBackground = true; windowThread2.Start(); Thread windowThread3 = new Thread(delegate() { verifing3(); }); windowThread3.SetApartmentState(ApartmentState.STA); windowThread3.IsBackground = true; windowThread3.Start(); } ``` As you can see , i tried the event `LayoutUpdated` but it is not the best idea, i think, because it is raised many times even the `container`'s content is not changed. - How can i resolve this? Thanks,

Accepted Answer

In WPF you can set to raise event for any `DependencyProperty` so if you would like to raise event on `Content` change

```
var desc = DependencyPropertyDescriptor.FromProperty(ContentControl.ContentProperty, typeof(UserControl));
desc.AddValueChanged(container, ContentPropertyChanged);
```

and do what you need in here:

```
private void ContentPropertyChanged(object sneder, EventArgs e)
{
   //event handler
}
```

Raising an event when the content of an user control change

Solution

Problem