Will the WPF user Control be Disposed if used inside a Windows Form that will be disposed?

Question

So I just learned that we can put a WPF UserControl to a windows Form using ElementHost control. If that windows form control was disposed, will the WPF user control be disposed too?

It is same. All object oriented programming language same. WPF usercontrol disposable. — ebattulga, Sep 16 '16 at 03:56
@ebattulga WPF UserControl is not `IDisposable` by default and will not `Dispose`. Take a look at this post: [Proper cleanup of WPF user controls](http://stackoverflow.com/questions/1550212/proper-cleanup-of-wpf-user-controls). The `Dispose` method of the `ElementHost` control checks if the `Child` is `IDisposable` then calls its `Dispose` method. So if you need to `Dispose` anything, you should implement `IDisposable` interface. — Reza Aghaei, Sep 18 '16 at 21:24

Reza Aghaei · Accepted Answer · 2016-09-18T21:31:33.213

If your WPF UserControl is IDisposable the answer is yes, otherwise no.

In the source code for Dispose method of ElementHost class which hosts a WPF UserControl, you can see this:

IDisposable child = this.Child as IDisposable;
if (child != null)
{
    child.Dispose();
}

Which means the Child will be disposed, if it's IDisposable.

Note

WPF doesn't rely on IDisposable interface for resource cleanup. But since the UserControl will be used in a Windows Forms Project in an ElementHost control which supports IDisposable pattern, you can rely on IDisposable pattern if you need to perform some resource clean up. But if it was a WPF project, you should use WPF mechanisms for resource clean up.

Will the WPF user Control be Disposed if used inside a Windows Form that will be disposed?

1 Answers1