Members of this class allows the caller to have internal access to the Win32 HWND and the parent HWND of a WPF Window. The proper security checks are performed by those members.
Use this class whenever you need a more specific object based on its HWND.
An example scenario is if you need to host a WPF dialog box in a Win32 application. Initialize the WindowInteropHelper with a WPF window object for the dialog. You can then get the WPF window's handle (HWND) from the Handle property and specify the owner for the WPF window with the Owner property. The following code example shows how to use WindowInteropHelper when hosting a WPF dialog box in a Win32 application.
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WindowInteropHelper wih = new WindowInteropHelper(myDialog);
wih.Owner = ownerHwnd;
myDialog.ShowDialog();
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Another scenario supported by this class is to obtain a HwndSource object from a WPF Window object. The HwndSource enables direct processing of Win32 messages through the AddHook method. By using HwndSource and AddHook in place of a Window you can still handle messages that have no equivalent or handling in WPF. Create a WindowInteropHelper with the Window source , then call Handle on the WindowInteropHelper to get from HWND to HwndSource.