/// <summary>
/// Called when the <c>DataContext</c> property of the <see cref="TargetView" /> has changed.
/// </summary>
/// <param name="sender">The sender.</param>
/// <param name="e">The <see cref="EventArgs"/> instance containing the event data.</param>
public virtual void OnTargetViewDataContextChanged(object sender, DataContextChangedEventArgs e)
{
if (IsCurrentDataContext(e))
{
return;
}
Log.Debug($"DataContext of TargetView '{TargetViewType?.Name}' has changed to '{ObjectToStringHelper.ToTypeString(TargetView.DataContext)}'");
LastKnownDataContext = null;
var dataContext = TargetView.DataContext;
if (ReferenceEquals(dataContext, null))
{
return;
}
if (dataContext.IsSentinelBindingObject())
{
return;
}
// Here we have a data context that makes sense
LastKnownDataContext = new WeakReference(dataContext);
if (ReferenceEquals(ViewModel, dataContext))
{
return;
}
// Check if the VM is compatible
if (_viewModelLocator.IsCompatible(TargetViewType, dataContext.GetType()))
{
// Use the view model from the data context, probably set manually
ViewModel = (IViewModel)dataContext;
}
}
