WPF Popup 置顶问题

问题：

使用wpf的popup，当在popup中弹出MessageBox或者打开对话框的时候，popup总是置顶，并遮住MessageBox或对话框.

解决：

写如下用户控件

 

需导入的空间: using System.Windows.Controls.Primitives;

    using System.Runtime.InteropServices;

    using System.Windows.Interop;

 

<textarea cols="50" rows="15" name="code" class="c-sharp:nogutter">public class CCPopup : Popup { public static DependencyProperty TopmostProperty = Window.TopmostProperty.AddOwner(typeof(CCPopup), new FrameworkPropertyMetadata(false, OnTopmostChanged)); public bool Topmost { get { return (bool)GetValue(TopmostProperty); } set { SetValue(TopmostProperty, value); } } private static void OnTopmostChanged(DependencyObject obj, DependencyPropertyChangedEventArgs e) { (obj as CCPopup).UpdateWindow(); } protected override void OnOpened(EventArgs e) { UpdateWindow(); } private void UpdateWindow() { var hwnd = ((HwndSource)PresentationSource.FromVisual(this.Child)).Handle; RECT rect; if (GetWindowRect(hwnd, out rect)) { SetWindowPos(hwnd, Topmost ? -1 : -2, rect.Left, rect.Top, (int)this.Width, (int)this.Height, 0); } } #region P/Invoke imports &amp; definitions [StructLayout(LayoutKind.Sequential)] public struct RECT { public int Left; public int Top; public int Right; public int Bottom; } [DllImport("user32.dll")] [return: MarshalAs(UnmanagedType.Bool)] private static extern bool GetWindowRect(IntPtr hWnd, out RECT lpRect); [DllImport("user32", EntryPoint = "SetWindowPos")] private static extern int SetWindowPos(IntPtr hWnd, int hwndInsertAfter, int x, int y, int cx, int cy, int wFlags); #endregion }</textarea>