How to use dynamic DataType in c#?

Question

Honestly, I don't know how to ask this one. Let me explain my scenario first.

From the answer that I have got from my last question:

...
var frame = sender as Frame;
UserControl1 uc1 = frame.Content as UserControl1;
MainViewModel mvm = uc1.DataContext as MainViewModel;
...

As you can see frame.Content changes and it can have different DataType. Therefore, I can't just write UserControl1. Now, what can I write as replacement for UserControl1 ?

Update: Added details

• frame.Content is changing upon user interaction
• I want to determine the current DataType of the DataContext of frame.Content during runtime

As always, please tell me if you want clarification.

Answer 1

If the only thing you need out of frame.Content is a DataContext you may try casting it to FrameworkElement, e.g.:

var frame = sender as Frame;
FrameworkElement content = frame.Content as FrameworkElement;
MainViewModel mvm = content.DataContext as MainViewModel;

If frame.Content is not always a FrameworkElement you may want to check that first:

var frame = sender as Frame;
FrameworkElement content = frame.Content as FrameworkElement;
if (content != null) {
    MainViewModel mvm = content.DataContext as MainViewModel;
    // work with mvm...
}
else {
    // Frame's content is something unexpected.
}