如果您需要找出正确的父窗口来显示您自己的WPF窗口，请将Application.ActiveWindow强制转换为IOleWindow（Application.ActiveWindow可以返回Explorer或Inspector，它们都支持IOleWindow）并调用IOleWindow.GetWindow。创建WindowInteropHelper类的示例，并将Outlook窗口句柄指定为父类：

if (outlookHwnd != IntPtr.Zero)
{
    WindowInteropHelper helper = new WindowInteropHelper(YourDialogWindow);
    helper.Owner = outlookHwnd;
    YourDialogWindow.ShowInTaskbar = false;
}

首先，您需要检索父窗口句柄，在Outlook中的Explorer窗口的情况下，您可以用途：

Outlook.Explorer explorer = OutlookApplication.ActiveExplorer();
IOleWindow oleWindow = explorer as IOleWindow;
IntPtr handle = IntPtr.Zero;

oleWindow.GetWindow(out handle);

if (handle != IntPtr.Zero)
{
    WindowInteropHelper helper = new WindowInteropHelper(DialogWindow);
    helper.Owner = handle;
    DialogWindow.ShowInTaskbar = false;
    DialogWindow.ShowDialog();
}

其中，IOleWindow可按以下方式定义：

/// <summary>
/// Implemented and used by containers and objects to obtain window handles
/// and manage context-sensitive help.
/// </summary>
/// <remarks>
/// The IOleWindow interface provides methods that allow an application to obtain
/// the handle to the various windows that participate in in-place activation,
/// and also to enter and exit context-sensitive help mode.
/// </remarks>
[ComImport]
[Guid("00000114-0000-0000-C000-000000000046")]
[InterfaceType (ComInterfaceType.InterfaceIsIUnknown)]
public interface IOleWindow
{
    /// <summary>
    /// Returns the window handle to one of the windows participating in in-place activation
    /// (frame, document, parent, or in-place object window).
    /// </summary>
    /// <param name="phwnd">Pointer to where to return the window handle.</param>
    void GetWindow (out IntPtr phwnd) ;

    /// <summary>
    /// Determines whether context-sensitive help mode should be entered during an
    /// in-place activation session.
    /// </summary>
    /// <param name="fEnterMode"><c>true</c> if help mode should be entered;
    /// <c>false</c> if it should be exited.</param>
    void ContextSensitiveHelp ([In, MarshalAs(UnmanagedType.Bool)] bool fEnterMode) ;
}